# Math notation

(David Rutten) #1

Just an informative message. We have enabled \LaTeX formatting for mathematical notation on discourse. Encase valid latex math inside dollar symbols and you can create fractions, super- and subscripts, roots, and a lot more:

For example, this notation:

$\frac{(12+144+20)+(3 \cdot \sqrt{4})}{7} + (5 \cdot 11)=9^2+0$


Yields:

\frac{(12+144+20)+(3 \cdot \sqrt{4})}{7} + (5 \cdot 11)=9^2+0

I don't fully understand "simplify"
#2

Latex \ is^{sexy}

(David Rutten) #6

Yep.

\lim_{x\to 0}{\frac{e^x-1}{2x}} \overset{\left[\frac{1+\sqrt{5}}{2}\right]}{\underset{\mathrm{H}}{=}} \lim_{x\to 0}{\frac{e^x}2}=\underbrace{ \{\frac{1}{4} + \frac{1}{8} + \frac{1}{16} + \frac{1}{32} + ... \}}_\text{an infinite sum}

#7

i am not sure what limits you are posting here can you describe that?
copying the latex expression from here is a bit fiddly, it seems to work when i activate plain source as the math renderer, but i have to switch back… not very comfortable.

\left[ \begin{array}{c} r_{0} \\ \theta \\ z \end{array} \right]\; =\; \left[ \begin{array}{c} 3+\sin t+\cos u \\ 2t \\ \sin u+2\cos t \end{array} \right],\; t=0…2\pi ,\; u=0…2\pi

toroid

(David Rutten) #8

I was just posting nonsense that looked interesting*, because my original example was so simplistic. It was also a limerick, but nobody noticed that:

A dozen, a gross and a score,
plus three times the square root of four,
divided by seven,
plus five times eleven,
equals nine squared and not a bit more.

* I mean if you forget about the gunk around the equals symbol it’s all true, but not very interesting or succinct. The limit of x going to zero of those two function is \frac{1}{2}.