## How to Use the Chat

Chat rooms are entirely bookmarkable.

## How to Send Math

Math should be enclosed between dollar signs ($). The markup between the dollar signs is standard LaTeX math typesetting. Using the multi-line entry box (not yet implemented) is recommended especially for complex math formulas. Line breaks will not affect what is displayed. Expressions are grouped together using curly brackets. See below for examples. Learn more by checking out any LaTeX math reference or the AMS LaTeX math guide.  What to type What is displayed Enclose math in dollar signs, like:$2+2=4$. Enclose math in dollar signs, like: $$2+2=4$$. Fractions are easy.$2+2=\frac{8}{2}$. Fractions are easy. $$2+2=\frac{8}{2}$$. Greek letters abound:$\alpha = \omega t$ Greek letters abound: $$\alpha = \omega t$$ The quadratic formula is:$x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$. The quadratic formula is: $$x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$$. Subscript stuff like$t_0$, superscript/exponentiate like$x^2$ Subscript stuff like $$t_0$$, superscript/exponentiate like $$x^2$$ Take integrals:$\Delta x=\int_{t_0}^{t_1} v(t)dt$ Take integrals: $$\Delta x=\int_{t_0}^{t_1} v(t)dt$$ Or limits:$\lim_{x\to0} \frac 1 x = \infty$ Or limits: $$\lim_{x\to0} \frac 1 x = \infty$$ Summations go as:$e^x=\sum_{n=0}^\infty\frac{x^n}{n!}$ Summations go as: $$e^x=\sum_{n=0}^\infty\frac{x^n}{n!}$$ Vectors:$\vec{a}$, dot products:$\vec{a}\cdot\hat{x}=a_x$, and cross products:$\vec{x}\times\vec{x}=\vec{0}$ Vectors: $$\vec{a}$$, dot products: $$\vec{a}\cdot\hat{x}=a_x$$,and cross products: $$\vec{x}\times\vec{x}=\vec{0}$$ Some people prefer vectors in bold:$\mathbf x$ Some people prefer vectors in bold: $$\mathbf x$$ Grad, div, curl:$\nabla Z$,$\nabla \cdot \vec{E}=\frac \rho {\epsilon_0}$,$\nabla \times \vec{E} = - \frac {\partial{\vec B}} {\partial t}$. Grad, div, curl:$$\nabla Z$$,$$\nabla \cdot \vec{E}=\frac \rho {\epsilon_0}$$,$$\nabla \times \vec{E} = - \frac {\partial{\vec B}} {\partial t}$$. Matrices are a pain in the ass:$\begin{pmatrix} 1 & 2 \\ 3 & 4 \end{pmatrix}$But multiple lines make them manageable. Matrices are a pain in the ass: $$\begin{pmatrix} 1 & 2 \\ 3 & 4 \end{pmatrix}$$But multiple lines make them manageable. If you want to talk about actual money, use two consecutive dollar signs and pay me$$20. If you want to talk about actual money, use twoconsecutive dollar signs and pay me$20. For more, read the AMS LaTeX math reference, linked above. For more, read the AMS LaTeX math reference, linked above.