## 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

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Master advanced concepts through explanations,

examples, and problems from the community.

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Learn from a vibrant community of students and enthusiasts,

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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

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TopNewestA simple example: for all positive integers \(k\), \[k!=1\cdot 2\cdot 3\cdot \ldots\cdot (k-1)\cdot k = \prod_{i=1}^k i.\]

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As \(\sum\) means addition, \(\prod\) means product.

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Product symbol

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we call it pie...it stands for continous product....

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ρ whatis standing for ut?

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pardon???

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I think means what does \(\rho\) stand for.

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it is pie , it means cyclical multiplication , just multiply cyclicaly!

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