RadMaths

Welcome to RadMaths! We will update popular maths problems and discussions to help you learn, think more and advance in Maths.
Brilliant staff support
LATE EVENTS:

Problems:
- Alice Smith
1. SAT 1000 series
2. Luogu series
3. reach the summit series
- Zakir Husain
1. Pre-RMO questions
- Jeff Giff
1. Dr Fiendish series
1,2,3,4
- Aryan Sanghi
1. When two lines meet series
2. Coordinate geometry series

Discussions:
- Zakir Husain
1. On area percentage series
1,2,3-bonus
2. Math also fails series
1,2
3. Recurring decimals
- Yajat Shamji
1.Recurring proof notes
See Recurring decimals.
2. Number spy challenges
1,2
- Gandoff Tan
- Vinayak Srivastava
1. PRMO discussion
- Páll Márton
1. Proof chain
- Jeff Giff
1. Bilingual geometry note

Formatting:
- Brilliant
1. $\LaTeX$ formatting guides
- Percy Jackson
1. $\LaTeX$ formatting guides
- Daniel Liu
1. $\LaTeX$ formatting guides
- Hamza Anushath
1. $\LaTeX$ formatting guides
- Páll Márton
1. $\LaTeX$ formatting guides

Markdown

Appears as

*italics* or _italics_

italics

**bold** or __bold__

bold


- bulleted
- list

bulleted
list


1. numbered
2. list

numbered
list

Note: you must add a full line of space before and after lists for them to show up correctly

paragraph 1

paragraph 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"

Math

Appears 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}

Easy Math Editor

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.
Stay on topic — we're all here to learn more about math and science, not to hear about your favorite get-rich-quick scheme or current world events.

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

Math	Appears 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}`	$\boxed{123}$

Comments

Sort by:

Top Newest

Nice, @Jeff Giff

Yajat Shamji - 4 months, 4 weeks ago

What about my Recurring Proof Notes? You think they are useful to your note, @Jeff Giff?

@Jeff Giff- Try my A Pre-RMO question! series, Math also Fails! series.

Zakir Husain - 4 months, 4 weeks ago

That's a definite one for @Jeff Giff to try - the Pre-RMO questions.

Also, RMO stands for...?

By the way, try this for Math Also Fails - $e^{i\pi} =-1, (e^\pi)^i =-1,$ then $i=\log_{e^\pi} -1?!$

Jeff Giff - 4 months, 4 weeks ago

No actually, definition of log clearly states that $log_ab$ is defined only when

$a \gt 0 and a \neq 1$
$b \gt 0$

Aryan Sanghi - 4 months, 4 weeks ago

Well it is correct, and not surprising if you know the Taylor series of $\ln$ and this

If you want a big and detailed explanation you can ask for that (can even write a note!)

Oops.. that’s logarithm for negative numbers :/

Good idea! I’ll add them :)

@Jeff Giff, Thanks for the mention for my $\LaTeX{}$ Guide but, it is a work in progress and I can suggest you better ones - Daniel Liu's Guide and Hamza Anushath's Guide.

Percy Jackson - 4 months, 4 weeks ago

Try my When two lines meet series, it is a series of hard questions for learning to solve questions using graph. Is this useful for your note?

@Jeff Giff- Kindly mention this note instead of my feed for Pre-RMO question series.

👌 OK!

@Jeff Giff, could you $\color{#333333}\text{add my note}$ too as a $\LaTeX$ guide, it has many new facts and features which may only have been mentioned by me

Frisk Dreemurr - 4 months, 3 weeks ago

Click the $\text{add my note}$ to access my note @Jeff Giff

@Jeff Giff, if you need anything from me, check out my profile and choose the series (i.e. if you choose one problem, you have to have the rest of the problems with that title.)

Yajat Shamji - 4 months, 3 weeks ago

@Jeff Giff - Kindly add this in RedMaths ''Late Events''

Zakir Husain - 4 months, 2 weeks ago

@Jeff Giff Thanks!

Check this out, @Páll Márton :)

Jeff Giff - 4 months ago

Wowie!!!!!! RadMaths has become even better! Good work @Jeff Giff! You'll have to organize it a bit though, like removing the Mathathon as it is over, adding more space between 2 different series, etc.

Percy Jackson - 4 months ago

@Jeff Giff it is Vinayak Srivastavsa not Yinayak @Vinayak Srivastava ?

Zakir Husain - 4 months ago

@Jeff Giff, check out this:

Magic Square Connections Study

Yajat Shamji - 4 months ago

@Jeff Giff - You can use buttons in RadMaths to make it more rad. See my note Buttons to learn button formatting :)

Percy Jackson - 3 months, 2 weeks ago

I used it in anther note :) I don’t think it is necessary to add buttons here :)

Jeff Giff - 3 months, 2 weeks ago

@Jeff Giff you might like to add my Coordinate geometry series. All of its questions are popular and level 5. :)

Aryan Sanghi - 2 months ago

The link is level 4 actually lol

Percy Jackson - 2 months ago

Yes, this question didn't live to the expectations, but it's atleast popular. :)

@Aryan Sanghi – Yes, it is a very good problem. I like all your problems, they are new and different, pretty cool according to me.

@Percy Jackson – Thanku very much for your appreciation. :)

Math	Appears 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}`	$\boxed{123}$