You can add math to your post either using either simple plain text math, or LaTeX.
You need to surround your math with <b>backticks</b> (not apostrophes).
<b>Mobile devices:</b> You can use <b><code>qq</code></b> at the beginning and end of your math - it's much easier than finding the back tick.
<h2>1. Plain text math</h2>
You can use calculator-like syntax (also called ASCIIMath).
<h3>Examples:</h3>
<b>Pythagoras' Theorem:</b> <code>`a^2 + b^2 = c^2`</code>, gives: `a^2 + b^2 = c^2`
If you are using a phone, you can enter the above example like this:
<code>qq a^2 + b^2 = c^2 qq</code>
(Note the <code>qq</code> at the beginning and end of the math.)
<b>Integral:</b> <code>`int0^(2pi) sin x dx=0`</code>
`int0^(2pi) sin x dx=0`
<b>Matrices:</b>
<code>`[(1,2,3),(4,7,2),(4,2,1)]`</code> gives
`[(1,2,3),(4,7,2),(4,2,1)]`
See <a href="/help/send-math-email-syntax.php">Syntax for ASCIIMathML</a> for all of the math symbols you can use, and how to enter them.
<h2>2. LaTeX math input</h2>
<h3>Examples:</h3>
<b>Partial fractions:</b>
<code>`\frac{\partial f(x,y)}{\partial x}=x^2 \cosh x^y`</code> gives
`\frac{\partial f(x,y)}{\partial x}=x^2 \cosh x^y`
<b>Summation notation: </b>
<code>`\sum{n=0}^{\infty}\frac{1}{2^n}=2`</code>, which produces:
`\sum{n=0}^{\infty}\frac{1}{2^n}=2`

Relevant page
<a href="/help/send-math-email-syntax.php">Syntax for ASCIIMathML</a>

The square root sign uses the following syntax:
<code>sqrt(a^2 + b^2)</code>
This produces:
`sqrt(a^2 + b^2)`
See all possible symbols in the link given above

Sure can! Here's the plain text math version:
<code>`(partial f(x,y))/(partial x)=x^2 cosh x^y`</code>
gives you
`(partial f(x,y))/(partial x)=x^2 cosh x^y`

Thank you very much for this, Murray. I did not know how to do cube root and now I do:)

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Thank you very much for this, Murray. I did not know how to do cube root and now I do:)

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