Formatting Guide for Questions and Comments
For formatting your questions, comments and solutions, you can use Markdown. Using Markdown, you can bold or italicize things, add links and add a full blank line.
For formatting mathematics, we use LaTeX throughout the site. This means that you can format the math parts of your question, comment or solution by putting certain code inside these brackets \(
... \)
. The tables below contain some symbols that you will need most often, with the "code" in the left column, and the result on the right.
Markdown code  Appears as  

*italics* or _italics_  italics  
**bold** or __bold__  bold  
 bulleted *Include an additional line break (empty row) before the start of a list. 
 
1. numbered 
 
paragraph 1  paragraph 1 paragraph 2  
> This is a quote  This is a quote  
[example link](https://brilliant.org)  example link  
![Brilliant Logo](http://cl.ly/image/3m1O2L2k380t)  
``` #By adding three tickmarks I've made a code block. while True: print "Solving problems now..." print "All done." ```  #By adding three tickmarks I've made a code block. while True: print "Solving problems now..." print "All done."  
```python #By adding three tickmarks and a language name, I've added syntax highlighting. while True: print "Solving more problems..." print "Achievement unlocked." ``` 
 


LaTeX Code  Appears as 

1 + 2  \( 1 + 2 \) 
2 \times 3  \( 2 \times 3 \) 
2 \cdot 3  \( 2 \cdot 3 \) 
2 * 3  \( 2 * 3 \) 
2^3  \( 2^3 \) 
2^{34}  \( 2^{34} \) 
2^34  \( 2^34 \) 
a_{i1}  \( a_{i1} \) 
a_i1  \( a_i1 \) 
2^a_1  \( 2^a_1 \) 
\frac {2}{3}  \( \frac {2}{3} \) 
\frac 234  \( \frac 234 \) 
LaTeX Code  Appears as 

\frac {1}{1 + \frac {1}{x}}  \( \frac {1}{1 + \frac {1}{x}} \) 
\sqrt{2}  \( \sqrt{2} \) 
\sqrt[3]{2}  \( \sqrt[3]{2} \) 
1 \pm i  \( 1 \pm i \) 
\frac{b \pm \sqrt{b^24ac}}{2a}  \( \frac{b \pm \sqrt{b^24ac}}{2a} \) 
2 < 3  \( 2 < 3 \) 
2 \leq 3  \( 2 \leq 3 \) 
3 \geq 2  \( 3 \geq 2 \) 
2 \neq 3  \( 2 \neq 3 \) 
x  \( x \) 
\boxed{123}  \( \boxed{123} \) 
LaTeX Code  Appears as 

\infty  \( \infty \) 
1 + 2 + 3 + \ldots + 10  \( 1 + 2 + 3 + \ldots + 10 \) 
\sum_{i=1}^3  \( \sum_{i=1}^3 \) 
\prod_{i=1}^{31}  \( \prod_{i=1}^{31} \) 
\displaystyle \sum_{i=1}^3  \( \displaystyle \sum_{i=1}^3 \) 
\log_2 4^6  \( \log_2 4^6 \) 
4 \equiv 2 \pmod{2}  \( 4 \equiv 2 \pmod{2} \) 
{6 \choose 3}  \( {6 \choose 3} \) 
\gcd(n,m)  \( \gcd(n,m) \) 
\angle ABC = 90 ^ \circ  \( \angle ABC = 90 ^ \circ \) 
LaTeX Code  Appears as 

\sin \theta  \( \sin \theta \) 
\cos 90^\circ = 0  \( \cos 90^\circ = 0 \) 
\tan \frac{\pi}{6} = \frac{1}{\sqrt{3}}  \( \tan \frac{\pi}{6} = \frac{1}{\sqrt{3}} \) 
\alpha, \beta, \gamma, \ldots  \( \alpha, \beta, \gamma, \ldots \) 
\overline{abba}  \( \overline{abba} \) 
\underline{abba}  \( \underline{abba} \) 
\rightarrow  \( \rightarrow \) 
\Rightarrow  \( \Rightarrow \) 
For a more extensive list of LaTeX symbols, you may refer to this Wikipedia page.
LaTeX Code  Appears as 

\ce{H2O}  \( \ce{H2O} \) 
\ce{CrO4^2}  \( \ce{CrO4^2} \) 
\ce{A <> B}  \( \ce{A <> B} \) 
\ce{A >[x_i] B}  \( \ce{A >[x_i] B} \) 
\ce{CO2 + C > 2 CO}  \( \ce{CO2 + C > 2 CO} \) 
\ce{A\bond{~}B\bond{~=}C\bond{~}D}  \( \ce{A\bond{~}B\bond{~=}C\bond{~}D} \) 