Beginner LaTeX Guide

${\LaTeX}$ is an extremely useful typesetting language to learn, especially in a math environment like this. However, the quick instructions Brilliant.org gives just aren't good enough to use for most situations.

This is why I've decided to create a beginner's ${\LaTeX}$ guide. There is a table of contents for easy symbol or format finding. I hope you can refer to this guide later, when writing solutions, problems, or notes.

Note: You can also view Latex codes by hovering over the equation. Read Seeing actual $\LaTeX$ for more details!

To quickly navigate to the part you want via the Table of Contents, press CTRL+F, and type in the section you want (including the tilde's ~ before and after the section).

~Using LaTeX~

~Text~

~Basic Operations~

~Fractions~

~Sums, Products, Limits, and Integrals~

~Modular Arithmetic~

~Trigonometry~

~Combinatorics~

~Geometry~

~Calculus~

~Parentheses~

~Fitting Parentheses~

~Tables and Arrays~

~Other~

~Using LaTeX~

To use LaTeX, put a backslash and a left parenthesis before the math you want to LaTeXify, and put a backslash and a right parenthesis after the math you want to LaTeXify. For example:

Imgur

Shows up as $1+2+3=6$

However, if you want your math to be more conspicuous and centered, you can use a backslash then a left bracket, then your math, then a backslash then a right bracket. For example:

Imgur

Shows up as

$1+2+3=6$

This second option is the display text. A lot of other math operations will look better in this text. To force the first option to also use display text, you can add a \displaystyle at the beginning.

~Text~

To write text in LaTeX use \text{your text here}. This gives $\text{your text here}$

To use bolded text, use \textbf{your text here}. This gives $\textbf{your text here}$

Italicized text is similar: \textit{your text here}. This gives $\textit{your text here}$

~Basic Operations~

"x+y" gives $x+y$

"x-y" gives $x-y$

"x=y" gives $x=y$

"x\times y" gives $x\times y$

"x\cdot y" gives $x\cdot y$

"x\div y" gives $x\div y$

"x\pm y" gives $x\pm y$

"x\mp y" gives $x\mp y$

x^{y} gives $x^{y}$

x_{y} gives $x_{y}$

\sqrt{x} gives $\sqrt{x}$

\sqrt[y]{x} gives $\sqrt[y]{x}$

\log_{a}b gives $\log_{a}b$

\ln a gives $\ln a$ (that's a lowercase "l" in the beginning, not an uppercase "i")

Note that many of you use "*" or "." for multiplying. This shows up as $*$ and $.$ which don't look good. Use $\times$ or $\cdot$ instead.

Also, the brackets in x^{y} or x_{y} may be omitted if the index is a single character. However, if it is more than one character like $x^{10}$, then brackets are needed or else it will show up as $x^10$.

~Fractions~

Many people simply put a slash between the numerator and denominator to represent a fraction: $x/y$. However, there are neater ways in LaTeX.

\frac{x}{y} is the standard way to write fractions: $\frac{x}{y}$

\dfrac{x}{y} gives a bigger clearer version. However, this takes up more vertical space: $\dfrac{x}{y}$ the "d" stands for "display text".

EXTRA

\cfrac{x}{y} is a special type of fraction formatting. This is for continued fractions, hence the "c". typing \cfrac{x}{x+\cfrac{y}{y+\cfrac{z}{2}}} gives $\cfrac{x}{x+\cfrac{y}{y+\cfrac{z}{2}}}$

~Sums, Products, Limits, and Integrals~

These four are in the same group because they format differently than other symbols.

"\sum" gives $\sum$

"\prod" gives $\prod$

"\lim" gives $\lim$

"\int" gives $\int$

We can add the other elements of each thing by using _ and ^:

\sum_{i=0}^n gives $\sum_{i=0}^n$

\prod_{i=0}^n gives $\prod_{i=0}^n$

\lim_{x\rightarrow n} gives $\lim_{x\rightarrow n}$

\int_{a}^{b} gives $\int_a^b$

However, these don't look very good. However, once putting it on display text, either using the brackets or using \displaystyle as said in the beginning of the guide, we can make them look normal.

\displaystyle\sum_{i=0}^n gives $\displaystyle\sum_{i=0}^n$

\displaystyle\prod_{i=0}^n gives $\displaystyle\prod_{i=0}^n$

\displaystyle\lim_{x\rightarrow n} gives $\displaystyle\lim_{x\rightarrow n}$

\displaystyle\int_{a}^{b} gives $\displaystyle\int_{a}^{b}$

~Modular Arithmetic~

"\equiv" gives $\equiv$

\mod{a} gives $\mod{a}$

\pmod{a} gives $\pmod{a}$

\bmod{a} is \mod{a} without the space before it: $a\bmod{b}$ versus $a\mod{b}$

"a\mid b" creates $a\mid b$, which states that $b$ is divisible by $a$.

~Trigonometry~

Many of you simply put "sin" and "cos" and be done with it; however, adding a backslash before those two make it look much better.

\sin gives $\sin$ (as opposed to $sin$)

\cos gives $\cos$ (as opposed to $cos$)

\tan gives $\tan$

\sec gives $\sec$

\csc gives $\csc$

\cot gives $\cot$

\arcsin gives $\arcsin$

\arccos gives $\arccos$

\arctan gives $\arctan$

Putting a ^{-1} after the trigonometric function designates it as the inverse. For example, \sin^{-1} gives $\sin^{-1}$.

\sinh gives $\sinh$

\cosh gives $\cosh$

\tanh gives $\tanh$

~Combinatorics~

\binom{x}{y} gives $\binom{x}{y}$

\dbinom{x}{y} gives $\dbinom{x}{y}$

~Geometry~

x^{\circ} gives $x^{\circ}$ the degree symbol

\angle gives $\angle$

\Delta gives $\Delta$, for example $\Delta ABC$

\triangle also does the job: $\triangle ABC$

\odot gives $\odot$, for example $\odot O$

AB\parallel CD gives $AB\parallel CD$

AB\perp CD gives $AB\perp CD$

A\cong B gives $A\cong B$

A\sim B gives $A\sim B$

~Calculus~

We've already learned to use $\int$. However, there is much more to calculus than integrals!

There is no command for the total derivative, so you have to use \text{d} to get around it.

For example, \dfrac{\text{d}}{\text{d}x} gives $\dfrac{\text{d}}{\text{d}x}$

Fortunately, there is a symbol for partial derivatives: \partial gives $\partial$.

So, \dfrac{\partial}{\partial x} gives $\dfrac{\partial}{\partial x}$

Double or even triple integrals can be condensed into \iint and \iiint, respectively. This gives $\displaystyle\iint$ and $\displaystyle\iiint$ (I am using display text).

EXTRA

Line integrals can be written as \oint: $\displaystyle \oint$.

~Parentheses~

( and ) are standard for parentheses: $(a+b)$

[ and ] are used for brackets: $[a+b]$

{ and } are used for curly brackets: $\{a+b\}$

\lfloor and \rfloor are used for the floor function: $\lfloor a+b\rfloor$

\lceil and \rceil are used for the ceiling function: $\lceil a+b\rceil$

\langle and \rangle are used for vectors: $\langle a,b\rangle$

The vertical line symbol | (not a capital "i" or a lowercase "l"!) is used for absolute value: $|a+b|$

~Fitting Parentheses~

Suppose you want to write $\left(\dfrac{a}{b}\right)^c$. When you try, it gives $(\dfrac{a}{b})^c$. How did I stretch the parentheses to fit?

To stretch the parentheses, use \left before the left parenthesis and \right before the right one, like this: \left( and \right). When put back into the expression, this yields $\left(\dfrac{a}{b}\right)^c$ as desired.

This isn't just for parentheses; you can use them on brackets: $\{\dfrac{a}{b}\}$ changes into $\left\{\dfrac{a}{b}\right\}$

You can also use this technique on things that use only one parenthesis/bracket/etc. However, just putting \left or \right will yield an error. This is because \left and \right come in pairs. In orer to sidestep this, you can put a period after the one that you do not need (i.e \left. or \right.). This way it will not produce an error, and it will stretch the parenthesis to size. For example, this: \left. \dfrac{x^3+2x}{3x^2}\right|_0^3 gives this: $\left. \dfrac{x^3+2x}{3x^2}\right|_a^b$

~Tables and Arrays~~

To make tables and arrays, use \ begin{array}{[modifiers]} ... \ end{array}. (A space is put before "begin" and before "end" to prevent the LaTeX from prematurely rendering. Even though there are no brackets around to make it render, it does so anyways, I don't know why.)

In the modifiers section, you put either l for left, c for center, or r for right, per column. For example, to make an array with 3 columns, all formatted to align along the right edge, you put "rrr" inside the modifier. It would look like this: \ begin{array}{rrr} ... \ end{array}.

To add a vertical line between two columns, put the vertical line symbol | between two modifiers: for example, if you wanted a horizontal line between the first two columns in the previous example, then you would put \ begin{array}{r|rr} ... \ end{array}.

For actual inputting in the array, there are two rules: put a "&" sign to notify to switch to the next column, and put a "\ \" divider (again a space is added in between to prevent it from rendering) to notify to switch to the next row. When building the table, always fill in row by row: in the first row, fill in all the corresponding columns, and then switch to the next row; then continue in this manner. For example, if I wanted to make a $3\times 3$ square with the numbers $1\rightarrow 9$, I would put: \ begin{array}{lcr}1 & 2 & 3 \ \ 4 & 5 & 6 \ \ 7& 8 & 9 \ end{array}. This produces: $\begin{array}{lcr}1 & 2 & 3 \\ 4 & 5 & 6 \\ 7& 8 & 9 \end{array}$.

To insert horizontal lines between any two rows, put \hline after the divider that separates the two rows. For example, if I wanted to add horizontal lines and vertical lines in the previous example to look like a tic tac toe board, this would be my code: \ begin{array}{l|c|r}1 & 2 & 3 \ \ \hline 4 & 5 & 6 \ \ \hline 7& 8 & 9 \ end{array} and it will produce: $\begin{array}{l|c|r}1 & 2 & 3 \\ \hline 4 & 5 & 6 \\ \hline 7& 8 & 9 \end{array}$

~Other~

To negate any symbol, put \not before the symbol. For example, "\not =" gives $\not =$

Look here for a big list of symbols.

If you don't know how to do something or see something missing in this guide, please do comment below so I can add it! Together, we can make a great LaTeX guide!

Note by Daniel Liu
7 years, 6 months ago

This discussion board is a place to discuss our Daily Challenges and the math and science related to those challenges. Explanations are more than just a solution — they should explain the steps and thinking strategies that you used to obtain the solution. Comments should further the discussion of math and science.

When posting on Brilliant:

• Use the emojis to react to an explanation, whether you're congratulating a job well done , or just really confused .
• Ask specific questions about the challenge or the steps in somebody's explanation. Well-posed questions can add a lot to the discussion, but posting "I don't understand!" doesn't help anyone.
• Try to contribute something new to the discussion, whether it is an extension, generalization or other idea related to the challenge.

MarkdownAppears as
*italics* or _italics_ italics
**bold** or __bold__ bold
- bulleted- list
• bulleted
• list
1. numbered2. list
1. numbered
2. list
Note: you must add a full line of space before and after lists for them to show up correctly
paragraph 1paragraph 2

paragraph 1

paragraph 2

[example link](https://brilliant.org)example link
> This is a quote
This is a quote
    # I indented these lines
# 4 spaces, and now they show
# up as a code block.

print "hello world"
# I indented these lines
# 4 spaces, and now they show
# up as a code block.

print "hello world"
MathAppears as
Remember to wrap math in $$ ... $$ or $ ... $ to ensure proper formatting.
2 \times 3 $2 \times 3$
2^{34} $2^{34}$
a_{i-1} $a_{i-1}$
\frac{2}{3} $\frac{2}{3}$
\sqrt{2} $\sqrt{2}$
\sum_{i=1}^3 $\sum_{i=1}^3$
\sin \theta $\sin \theta$
\boxed{123} $\boxed{123}$

Sort by:

If there is anything that doesn't make sense or is organized bad, please tell me so I can fix it.

I know that regular notes get hopelessly lost in the Feed even just after a few days. However, I wish that somehow this can survive, because I have noticed a lot of people in need in learning some basic LaTeX. Maybe someone can do something about this?

- 7 years, 6 months ago

Just a note here: For limits, I like using "\lim \limits_{a \to b} a" which yields $\lim \limits_{a \to b} a$

- 7 years, 4 months ago

Daniel Liu we can also use "n\choose{r}" to display $n\choose{r}$

- 6 years, 5 months ago

This is a fantastic idea. I think that we should either make a guide accessible like the algebra dictionary, or brilliant should have a link to this (and other support notes like it) in the formatting guide.

Notice that brilliant does have some well chosen examples. I think that it's just a good idea to expound upon them as you are.

- 7 years, 6 months ago

This is a fantastic idea. I think that we should either make a guide accessible like the algebra dictionary, or brilliant should have a link to this (and other support notes like it) in the formatting guide.

That would be great!

- 7 years, 6 months ago

This is a useful idea. I think that we should make a guide accessible like the algebra dictionary.

- 7 years ago

Can you write the symbol for infinity in Latex if so how ?

- 6 years, 9 months ago

\infty @Abdur Rehman Zahid

- 6 years, 9 months ago

Thanks

- 6 years, 9 months ago

I want to suggest a correction for the Parentheses section.

$\backslash\{$ and $\backslash\}$ are used for the curly brackets: $\{a+b\}$

Note that not giving the slash makes the parentheses disappear when the $\LaTeX$ output is rendered.

- 6 years, 4 months ago

{a and c}

- 5 years, 9 months ago

I'm not sure how your reply is relevant to my comment. You haven't used $\LaTeX$. You just wrote it in plain text. My comment illustrated how braces aren't rendered in $\LaTeX$ output if you don't escape it using a backslash.

If you're typing in plain text, then there's no need to escape it since plain text is rendered as it is in output.

- 5 years, 9 months ago

- 5 years, 11 months ago

Why not make this a wiki??

- 5 years, 5 months ago

@Daniel Liu, how do you put a fraction as the numerator of another fraction?

- 1 year ago

Yes, if you could put all the produced results first and then the HOW-TOs, that'd be great. It'd be like a LaTeX dictionary. The way it is now is hard to skim through with an eye to find the thing you want in the nexus of information.

A great guide, by the way.

- 6 years, 10 months ago

Awesome note for all learners ! $\LaTeX$ is truly useful and the following wikipedia page is also helpful for this purpose.

What I want to add in this note is the $\LaTeX$ colors , I try to use them in $\color{#D61F06}{problems}$ and $\color{#20A900}{Solutions}$

For that , you have to type

For example, " \color{Green}{Maths} " will appear as $\color{#20A900}{Maths}$

" \color{Blue}{Maths} " will appear as $\color{#3D99F6}{Maths}$...

Also the use of " \Huge" , it is used for getting big fonts, like

" \Huge{Maths}" will appear as $\Huge{Maths}$

@Daniel Liu , try getting this in the note too .....

- 7 years ago

$\mathbb{\Huge{\color{midnightblue}{How \text{ }To \text{ } Swear\text{ } In\text{ } Mathematics, \sqrt{-1}}}}$

Wow really cool! :)

- 6 years, 12 months ago

$\Huge\color{#20A900}{NICE}$
How did you changed the font??

- 5 years, 11 months ago

Wait how did you do the CASTELLAR font? Code?

- 8 months ago

No, he/she used MathBB. This is the Latex if you want -

\(\mathbb{\Huge{\color{midnightblue}{How \text{ }To \text{ } Swear\text{ } In\text{ } Mathematics, \sqrt{-1}}}}\)

Copy paste the complete line above. You will get this -

$\mathbb{\Huge{\color{midnightblue}{How \text{ }To \text{ } Swear\text{ } In\text{ } Mathematics, \sqrt{-1}}}}$

$\mathbb{\color{midnightblue}{HOW \text{ }TO \text{ } SWEAR\text{ } IN\text{ } MATHEMATICS, \sqrt{-1}}}$

Thanks!

- 8 months ago

No prob :)

$\Huge{\text{Aditya}}{\text{Raut}}$ Wow! This is cool!!@Aditya Raut

- 6 years, 8 months ago

$\huge{\color{#D61F06}{Z} \color{#20A900}{U} \color{#3D99F6}{H} \color{midnightblue}{A} \color{lightpink}I \color{#EC7300}{R}}$

- 4 years, 4 months ago

Nice !

For posting solutions , I prefer the following pages :

Hope that helps ! :3

- 7 years, 6 months ago

Another suggestion: \oint for surface integral ($\oint$).

- 7 years, 6 months ago

Hmm... I said \oint was for line integral in the Calculus section. Surface integral, line integral, same thing.

- 7 years, 6 months ago

Thank you for this guide; I'm just learning how to use LaTex and this is all extremely helpful.

One question: is there a way to push lines slightly to the right (like the Tab feature in word processors) without pushing them all the way to the middle? For example, in the lines

${(p-1)}^p \equiv -1 \pmod {p^2}$

$\equiv {p^2-1} \pmod {p^2}$

$\equiv {(p-1)(p+1)} \pmod {p^2}$

I would really like to have the equivalence symbol in the second and third lines line up with the one in the first line. Is there a way to do that?

- 3 years, 7 months ago

@zico quintina - I know the perfect command that does wonders like this -

$\underline{Centered \ and \ Aligned \ Equation}$

\begin{aligned} (p-1)^{p} & \equiv -1 \pmod p^{2} \\ &\equiv p^{2}-1 \pmod p^{2} \\ &\equiv (p+1)(p-1) \pmod p^{2}\end{aligned}

I used the $\LaTeX{}$ command that lets us create an equation array, and this helps us align the $=$ or $\equiv$ symbols. The picture below is the $\LaTeX{}$ command that I used.

The Latex for the equation that I wrote :)

Whenever you want to break the line as in go to the next line, give \ and don't forget to add & behind the thing you want to align, as in the above code, I have typed & right behind all three \equiv as I wanted to align them. Hope you understood!

If you have other $\LaTeX{}$ doubts, ask the community by posting it on my $\LaTeX{}$ Discussion Note, which you will find in my feed(after looking around a little). I shall answer the doubt quickly, or ask few other BRILLIANT users that I know of to tell you the solution, and either way, your question will be answered quickly. @zico quintina

I just realized that your comment is $\huge Freaking \ 2 \ years \ and \ 7 \ months \ old$ @zico quintina

Nice

- 7 years, 6 months ago

This site is a good way to get off the ground quickly with all the different symbols: http://www.codecogs.com/latex/eqneditor.php

Staff - 7 years, 4 months ago

@Josh Silverman How to add letters in it?

- 3 years, 8 months ago

Sorry I don't understand the question, what do you want to add?

Staff - 3 years, 8 months ago

Is there a way to add variables in it?

- 3 years, 8 months ago

Oh I get it. Yes, for instance if you want to do $E=mc^2$ you'd just type in

Staff - 3 years, 8 months ago

Thanks Sir.

- 3 years, 8 months ago

THIS IS AWESOME! HUHUHUHU

- 6 years, 12 months ago

Yeah. :D

- 6 years, 11 months ago

Hey, what course are you in? And we're batchmates, I reckon.

- 6 years, 11 months ago

Civil Engineering. :) And you're Journalism, right? :D

Sorry, I don't understand your use of the word "batchmates". XD

- 6 years, 11 months ago

2012? :)

- 6 years, 11 months ago

Nope, 2013. :)

- 6 years, 11 months ago

Na-feel ko nga kasi 17 ka haha

- 6 years, 11 months ago

:)))

Take note lang ha, 'di tayo parehas ng high school. Wala lang sinabi ko lang haha XD

- 6 years, 11 months ago

Of course, I know. Kilala sana kita if oo. :)

- 6 years, 11 months ago

- 7 years, 6 months ago

Hmm... The link isn't to this post though. Probably a glitch. I explicitly posted the link.

- 7 years, 6 months ago

I suppose that works too. This is a really great post.

- 7 years, 6 months ago

- 7 years, 6 months ago

I added tables and arrays, that will probably suffice for making matrices too.

- 7 years, 6 months ago

$\Huge{Brilliant\;Is\;So\;Awesome\;!!!}$

- 6 years, 8 months ago

There is a typo the line just above "Tables and Arrays". In Fitting Parentheses
display is an error. \left. \dfrac{x^3+2x}{3x^2}\right|_0^3 should give $~~~~\color{#D61F06}{ \large \ \left. ~~\right |_0^3}$

- 6 years ago

A note on integrals in $\LaTeX$: [[ \mbox{\iiint} ]] gives $\iiint$ It can also be written as [[\mbox{\int \! \! \! \! \int \! \! \! \! \int}]], giving $\int \!\!\!\! \int \!\!\!\! \int$ While this is unncessary in Brilliant, it is used in actual $\LaTeX$ editors when the "esint" package (which contains \iiint) is not available.

Here, the symbol [[ $\mbox{\!}$ ]] removes a certain space between two characters.

- 5 years, 10 months ago

Whats wrong with this?

\color{#3D99F6}\text{S = x^2 - 8\lfloor x \rfloor + 10}

- 4 years, 4 months ago

Use \color{Blue} {S = x^2 - 8\lfloor x \rfloor + 10} to get $\color{#3D99F6} {S = x^2 - 8\lfloor x \rfloor + 10}$

- 4 years, 4 months ago

$\color{#3D99F6}{S = x^2 - 8\lfloor x \rfloor + 10}$

- 4 years, 4 months ago

Thanks!!

- 4 years, 4 months ago

What's wrong in this:\displaystyle \frac{\pi}{2} = \frac{1]{2} \sum_{n=0}^\infty \frac{(n!)^2 2^{n+1}}{(2n+1)!} = \sum_{n=0}^\infty \frac{n!}{(2n=1)!! = 1 + \frac{1}{3} + \frac{1 \times 2}{3 \times 5} + \frac{1 \times 2 \times 3}{3 \times 5 \times 7} + \cdots = 1 + \frac{1}{3}(1 + \frac{2}{5}(1 + \frac{3}{7}(1 + \frac{4}{9}(1 + \cdots))))

- 2 years, 10 months ago

displaystyle \frac{\pi}{2} = \frac{1}{2}..., change ] to }

- 2 years, 10 months ago

oh! Thank you!

- 2 years, 10 months ago

$\displaystyle \frac{\pi}{2} = \frac{1}{2} \sum_{n=0}^\infty \frac{(n!)^2 2^{n+1}}{(2n+1)!} = \sum_{n=0}^\infty \frac{n!}{(2n=1)!!} = 1 + \frac{1}{3} + \frac{1 \times 2}{3 \times 5} + \frac{1 \times 2 \times 3}{3 \times 5 \times 7} + \cdots = 1 + \frac{1}{3}(1 + \frac{2}{5}(1 + \frac{3}{7}(1 + \frac{4}{9}(1 + \cdots))))$

- 2 years, 10 months ago

@X X I already know! Thank you for helping me even if I bothered you or wasted your time!

- 2 years, 10 months ago

No, because there is one more mistake. What is (2n=1)!!

- 2 years, 10 months ago

@X X I already edited it in the note

- 2 years, 10 months ago

@X X By the way $\large \displaystyle \sum_{n=0}^\infty \frac{n!}{(2n-1)}!! = \dfrac{4 + \pi}{2}$ and not $\dfrac{\pi}{2}$

- 2 years, 10 months ago

It is not - but +

- 2 years, 10 months ago

You forgot to tell about matrices and piecewise functions, but still good job. $\displaystyle \oint _{S} \vec{E} \cdot d\vec{s} =\frac{Q_{enclosed}} {\epsilon _{\circ}}$

- 2 years, 10 months ago

Just one thing that's quite common: $a \mid b$ for divisibility use \mid to create the line. Other than this, the post is great! Thanks for it! :)

- 7 years, 6 months ago

- 7 years, 6 months ago

Thanks Daniel.

- 7 years, 6 months ago

May I ask how can I create tables in LaTeX?

- 7 years, 6 months ago

I have written the guide to tables and arrays. At first I thought that I shouldn't write it because this was a basic latex guide, but since you asked for it, I put it on. See if you can understand what I wrote, and if you can't you can tell me why and I will change it.

- 7 years, 6 months ago

Yup! I understood! Thanks a lot!!! :)

- 7 years, 6 months ago

This is really helpful, thanks a lot Daniel!!

- 7 years, 4 months ago

Are geometry diagrams made with latex? How?

- 7 years, 4 months ago

No. Geometric Diagrams are made with a typesetting language called Asymptote Vector Graphics Language.

- 7 years, 4 months ago

Nope.

- 7 years, 4 months ago

Something I never got around to asking here is, how do you get the light grey line to denote section breaks? When I add a section break, I put \text{............................................................................................................} between the display delimiters, but I never figured out how to automate that with the grey lines.

- 7 years, 4 months ago

by putting three or more underscores in a row. like this: _

- 7 years, 4 months ago

Can you explain a little bit more about the above $\LaTeX$ use

and what about squaring the mod of a vector I mean

$\huge{\stackrel{\rightarrow}{|v|}}$

if I try to square it then it becomes either $\huge{\stackrel{\rightarrow}{|v|^2}}$ or $\huge{{\stackrel{\rightarrow}{|v|}^2}}$

- 6 years, 10 months ago

See how it is written here by putting cursor over it. .

$| \vec v|^2$

- 6 years, 10 months ago

Use \huge{\left|\vec{v}\right|}^2 for ${\left|\vec{v}\right|}^2$

- 5 years, 10 months ago

--- will give :

- 5 years, 10 months ago

How to write Pi in latex?

- 7 years, 4 months ago

Use \pi

$\pi$

- 7 years, 4 months ago

Thanks man. Been looking for something like this.

- 7 years ago

One question how did you make "LATEX" look like that .

- 7 years ago

\LaTeX

- 7 years ago

One more thing, for summation and production, it's required to put curly brackets { } between $n$ if you have more than 1 characters on $n$. Otherwise it'll show as $\displaystyle\sum_{i=0}^2014 i$ instead of $\displaystyle\sum_{i=0}^{2014} i$. (Note that other brackets don't work.)

When NOT using "\text " while in Latex,
for " space " we can use "~".

Say:-In Latex.....>\ ( (I~am~~~coming~~~~) \ ) gives:-
(I#am###coming####)...... "#" stands for space here.

- 7 years ago

I find this note very, very nice! :D

I have a question: How should I write the definition of absolute value using LaTeX?

- 6 years, 12 months ago

The best is simply the symbol | on your keyboard. For division there's a better one, though - /mid.

- 6 years, 12 months ago

But how about the brace { used for piecewise defined functions? The definition of absolute value uses that :)

- 6 years, 11 months ago

You'd use the same latex that you'd use for systems of equations.

f(x) = \begin{cases} 1 \\ 2 \end{cases} gives $f(x) = \begin{cases} 1 \\ 2 \end{cases}$

Put what you want between \begin{cases} and \end{cases} and separate new lines with \\.

- 6 years, 11 months ago

Oh, that's nice. :) Thanks. :)

- 6 years, 11 months ago

What's the code for =>, not $\geq$

- 6 years, 11 months ago

If you mean an arrow, there are quite a few codes for it: \implies or \Rightarrow or \rightarrow or \Longrightarrow or \to or \longrightarrow or \mapsto or \longmapsto.

- 6 years, 11 months ago

thank you, the first one was the one I was looking for

- 6 years, 11 months ago

Also, what's the latex for putting a black square around the answer when you're writing solutions.

- 6 years, 11 months ago

\boxed { }

@Daniel Liu There are lots of symbols on the AoPS page you linked to, but there is some $\LaTeX$ stuff you should definitely add, like systems of equations (we use \begin{cases} .. \\ ... \\ ..\end{cases} for this) and \boxed { }. These don't exist on the AoPS page.

I also like to use \stackrel { } to get some text shown above symbols.

E.g. \stackrel{\text{AM-GM}}\ge gives $\stackrel{AM-GM}\ge$. This is optional, though.

- 6 years, 11 months ago

[@Daniel Liu ], How do I denote vectors by latex?

- 6 years, 11 months ago

@Abhimanyu Swami Here's your query ...type this \stackrel{rightarrow} v and you get this

$\huge{ \stackrel{\rightarrow} v}$ and you might also want.. $\huge{\stackrel{\rightarrow}{|v|}}$.

- 6 years, 10 months ago

$\stackrel {\rightarrow} { v^2}$ .......This is what I get with \stackrel {\rightarrow} { v^2}

- 6 years, 10 months ago

Srry put a slash before the rightarrow word I mean \stackrel{\rightarrow}{v} you'll get this time .

Arya

- 6 years, 10 months ago

Thanks. With the correction and adding {v^2} with in { } that is.....
\stackrel {\rightarrow} { v^2} ..gives :- $~~~~~~~~~~~~~~ \\ \stackrel {\rightarrow} { v^2}$

- 6 years, 10 months ago

$\begin{array}{l|c|r}\huge Normal~Vectors \\\hline\end{array}$

Use \vec{v} for $\huge\displaystyle\vec{v}$

$\begin{array}{l|c|r}\huge Unit~Vectors \\\hline\end{array}$

Use \hat{\imath}\;\;\hat{\jmath}\;\;\hat{k} for $\huge\hat{\imath}\;\;\hat{\jmath}\;\;\hat{k}$

\imath' and\jmathgets rid of the the dot overiandj.

- 5 years, 10 months ago

$\text{awesome post}$

- 6 years, 10 months ago

$\text{your text here}$

- 6 years, 10 months ago

For i = 1 , 2 ,$\cdots$, n , let $a_{i}$ and $b_{i}$ be non-negative real numbers. Then $\left( a_{1} + a_{2}+\cdots + a_{n}\right)$ $\left( b_{1}+ b_{2} +\cdots + b_{n}\right)$ $\geq$ $\left( \sqrt{a_{1}b_{1}} +\sqrt{a_{2}b_{2}} +\cdots +\sqrt{a_{n}b_{n}} \right) ^{2}$

- 6 years, 7 months ago

${sec}^{2} \theta + 16{sec}^{2} \phi + 49{sec}^{2} \delta + 8\sec \theta \sec \phi + 56\sec \phi \sec \delta + 14\sec \theta \sec \delta$

- 6 years, 4 months ago

Use \sec^2 \delta for $\sec^2 \delta$

- 5 years, 10 months ago

Thanks...

- 6 years, 2 months ago

$\text{your text here}$

- 6 years, 2 months ago

Aditya Chauhan $\text{your text here}$ You have to put the $\backslash ( \backslash )$ around the Latex

- 5 years, 11 months ago

What is wrong with this latex????

[3^{$4n-3$}]

- 6 years, 1 month ago

$3^{4n-3}$ I think it is OK see my Latex code.

- 6 years, 1 month ago

Enclose it in \[

- 4 years, 4 months ago

- 6 years, 1 month ago

The $\LaTeX$ code for $\infty$ is \infty.

- 6 years, 1 month ago

- 6 years, 1 month ago

I am trying it from many days and still not able to do so.

- 5 years, 10 months ago

[Brilliant](http://www.brilliant.org) gives you Brilliant. Since this is a Markdown feature and not a $\LaTeX$ feature, don't enclose it in slash brackets as you do with math code.

Basically, the syntax is [hyperlink_text](url_to_page).

Here's a screenshot of output corresponding to Markdown code for ease of understanding:

Image$~~~\large\overset{\textrm{output}}{\implies}~~~$ Image

with the hyperlink directing you to the specified url.

- 5 years, 10 months ago

Thanks a lot....

- 5 years, 10 months ago

For eg. $\left(\large \cfrac{a+b}{c+\cfrac{d}{e+f}}\right)$

Here,brackets are not able to cover up the whole expression..
Thanks,now it's working.

- 5 years, 10 months ago

Use \left before opening bracket and \right before closing bracket to make the brackets auto-resize themselves to cover up the entire expression.

The basic syntax for the type of brackets you need is \text{\left(}\cdots\text{\right)} as opposed to the normal bracketing $\text{(}\ldots\text{)}$.

- 5 years, 10 months ago

- 5 years, 5 months ago

\rightarrow gives $\rightarrow$.

If you want a longer one, affix "long". Thus, \longrightarrow gives $\longrightarrow$.

- 5 years, 5 months ago

Thank you kuya Jaydee :) See you in automathic

- 5 years, 5 months ago

@Ali Hamaiz Here is the note I was talking to you about.

- 5 years, 2 months ago

What about lesser than equal to?

- 4 years, 8 months ago

\le will give you $\le$

- 4 years, 8 months ago

Thanks

- 4 years, 8 months ago

Can you please mention 'belongs to' sign\symbol?

- 4 years, 4 months ago

This will help. Type \in to get $\in$.

- 4 years, 4 months ago

Thanks, it worked :)

- 4 years, 4 months ago

:-)

- 4 years, 4 months ago

If someone can help me out , please!!!

How can we add a picture and how can we link one page to another ??

- 4 years, 4 months ago

• Use [text here](link) to add link.
• Use ![caption](link) to add image. (You can as well ignore the caption, put it blank [])

- 4 years, 4 months ago

Like I was trying this

'THRILLER'

What is wrong?

- 4 years, 4 months ago

OK. It's because markdown is disabled over there. Use inside latex : \href{link}{\text{caption}}

- 4 years, 4 months ago

Thanks a lot.!

- 4 years, 4 months ago

It got converted to a link here , but not where I intended to!!!!!

See the caption under the set name by clicking on the link below . It is not getting linked??/ Why?

- 4 years, 4 months ago

Who to write infinity??

- 4 years, 4 months ago

\infty will give you $\infty$, infinity symbol.

- 4 years, 4 months ago

thank you

- 4 years, 4 months ago

\infty

- 3 years, 8 months ago

\infty

- 2 years, 10 months ago

Who to write infinity??

- 4 years, 4 months ago

code for less than and greater than plzz

- 4 years, 4 months ago

• Use \le for $\le$
• Use \ge for $\ge$

- 4 years, 4 months ago

i dont need quality

- 4 years, 4 months ago

OK. Use

• < for $<$
• > for $>$

- 4 years, 4 months ago

What is the issue with this?

I wanted to color only $102^2$ but this did not happen

$100^2 + 101^2 + \color{#3D99F6}{102^2} + \cdots + 998^2 + 999^2 + 1000^2$

- 4 years, 4 months ago

Use ...\color{blue} {102^2}\color{black}... to unflag it. I don't know the reason though...​ $100^2 + 101^2 + \color{#3D99F6}{102^2} \color{#333333} + \cdots + 998^2 + 999^2 + 1000^2$

- 4 years, 4 months ago

I got the error...See this

$100^2 + 101^2 + {\color{#3D99F6}{102^2}} + \cdots + 998^2 + 999^2 + 1000^2$

- 4 years, 4 months ago

$100^2+101^2+{ \color{#3D99F6}{100^3} }+104^2+....$
code:....100^2+101^2+ { \color{blue}{100^3} } +104^2+....
100^2+101^2+$\color{#D61F06} { \{}$ \color{blue}{100^3} $\color{#D61F06}{\}}$ +104^2+....
See the extra pair of { } around "" \color{blue}{100^3} "" which I have shown in red, but { } are in normal color( here, in black).

- 2 years, 10 months ago

Like when we conclude two things from a statement , we use \begin{cases} and \end{cases}.

What do we use when we conclude one thing from two things??Like the opposite kind of braces I want as in \begin{cases} ....

- 4 years, 4 months ago

I think you should make a column for the arrows...

- 4 years, 1 month ago

How to write Right arrow symbol on LaTex?

- 4 years, 1 month ago

• Use \rightarrow for $\rightarrow$
• Use \Rightarrow for $\Rightarrow$

- 4 years, 1 month ago

Thanks. I just want the second one $\Rightarrow$

- 4 years, 1 month ago

You may also want \implies` : $\implies$

- 4 years, 1 month ago

We can also use \mathrm{d} for the total derivative command you are talking about.

Like $\dfrac{\mathrm{d}}{\mathrm{d}x}.e^{x}=e^x$

:)

- 4 years ago

With my mac \left, \right does not work. Big work as under.
big ( your text big ). Same for left and right.
Four sizes: big,....bigg,......Big,......Bigg.

- 4 years ago

One way of quickly figuring out what the code for a special character is, is this tool.

- 3 years, 6 months ago

Hey how to do this?

Like writing the catalyst of reaction above the arrowhead like in this https://www.google.co.in/search?q=wurtz+reaction&dcr=0&source=lnms&tbm=isch&sa=X&ved=0ahUKEwisMDt-evYAhVBQo8KHcgzAaoQAUICigB&biw=1366&bih=637#imgrc=F_pnGGhHIpA7NM:

- 3 years, 6 months ago

Is there a 'strikethrough' feature in LaTeX? I'm trying to show a a product of fractions with several factors in numerators and denominators cancelling each other out. So far all I've found is the \not feature, but this works very poorly; e.g. when I try \not{147}, I get $\not{147}$, with only the 1 crossed out.

I would like to be able to cross out entire numbers; ideally, I'd also like to show either the strikethrough or the number (preferably not both) in a variety of colors.

Do you know whether this can be done? Thanks!

- 3 years, 1 month ago

- 3 years, 1 month ago

How do you write bold AND italicized text.

- 2 years, 11 months ago

Do you mean this?

You can type it like $^{***}text^{***}$,but don't use LaTeX.

- 2 years, 11 months ago

How do we input the Riemann Zeta function

- 2 years, 10 months ago

$\zeta(x)$ \zeta(x)

- 2 years, 10 months ago

Can someone help me with this : $\displaystyle \pi = \frac{3}{4} \sqrt{3} + 24 \int_{0}{\frac{1}{4}} \sqrt{x-x^2} \text{dx} = \frac{3 \sqrt{3}}{4} + 24 \left(\frac{1}{12} - \frac{1}{5 \times 2^5} - \frac{1}{28 \times 2^7} - \frac{1}{72 \times 2^9} \cdots \right)$