## Excel in math and science

### Master concepts by solving fun, challenging problems.

## It's hard to learn from lectures and videos

### Learn more effectively through short, conceptual quizzes.

## Our wiki is made for math and science

###
Master advanced concepts through explanations,

examples, and problems from the community.

## Used and loved by over 5 million people

###
Learn from a vibrant community of students and enthusiasts,

including olympiad champions, researchers, and professionals.

Easy Math Editor

`*italics*`

or`_italics_`

italics`**bold**`

or`__bold__`

boldNote: you must add a full line of space before and after lists for them to show up correctlyparagraph 1

paragraph 2

`[example link](https://brilliant.org)`

`> This is a quote`

Remember to wrap math in \( ... \) or \[ ... \] to ensure proper formatting.`2 \times 3`

`2^{34}`

`a_{i-1}`

`\frac{2}{3}`

`\sqrt{2}`

`\sum_{i=1}^3`

`\sin \theta`

`\boxed{123}`

## Comments

Sort by:

TopNewestWhat is WeChat???

Log in to reply

My favorite comment of all time too. But I can't even tell the difference between QQ and Wechat, except that Wechat is supposed to be targeted towards more Western audiences.

Log in to reply

Haha, was expecting this comment! :D

Log in to reply

Hahaha

Log in to reply

Oh no, I don't know what is troll and what isn't. I guess we've entered real troll status.

Log in to reply

Yeah, better watch out. Have you gotten any of my emails?

Log in to reply

Well I'm on skype but not on we chat

Log in to reply

For anybody who doesn't know, WeChat is like KiK+Skype. It's pretty cool.

Log in to reply

What is Kik?

Log in to reply

Well, Kik is WeChat - Skype. Does that help?

Log in to reply

Log in to reply

Log in to reply

Log in to reply