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### equation* environment or ? [duplicate]

So, I'm writing a mathematics paper, and let's say I have the following: \begin{equation*} 2+2=4 \end{equation*} Is this the proper way to do an unnumbered equation, or is it preferred to do the ...
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### Difference in the three methods for unnumbered equation [duplicate]

What is the (subtle) difference between the three ways to typeset unnumbered equations (if any)? The first is the plain tex, $$E = mc^2$$ The second is the LaTeX $E = mc^2$ And the third is ...
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### Why is $...$ preferable to $$...$$?

I've heard that you should use $...$ for displayed equations instead of $$...$$, but why is that? I'd assumed that it's so that you can more easily tell which are starting and which are ending ...
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### How do I turn off equation auto numbering

I have an equation like this: \begin{align} P(A \cup B) = \sum_{\omega \in A \cup B} P(\omega) = \sum_{\omega \in A} P(\omega) + \sum_{\omega \in B} P(\omega) = P(A) + P(B) \end{...
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### align vs equation

I always use align in my documents, and avoid equation. Is there anything wrong with that? My reasoning behind this: align > equation, so why not use it?
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### Getting the expectation symbol to behave like $\sum$ instead of $\Sigma$

How can I get an expectation symbol which behaves like $\sum$? Specifically, I want the underscore to be like that of a summation. At the moment I use $$\mathbb{E}_{x\in A}$$ However, I do not ...
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### How to draw matrix with dots?

How can I draw a matrix with dots in tex like the one shown below:
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### How do I use AMS Euler?

% What to do here \begin{document} This is good integration. $$\displaystyle \int x dx = \frac{x^2}{2}$$ \end{document} I don't know much about LaTeX so I am going to need some spoon feeding. ...
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### Can I get $$...$$ to behave like $...$?

Is it possible to modify LaTeX so that good old $$...$$ behaves like $...$ (and by this I mean that it should be synonymous to it). If yes: Dear LaTeX3 developer, please integrate this into LaTeX3! ...
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I've been having a bit of trouble typesetting (n-th power) Legendre symbols. I've set up the command \newcommand{\Leg}[3][]{\left(\frac{#2}{#3}\right)_{#1}} But, when I type e.g. \Leg[3]{\pi}{\...