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Questions designed to generate a "big list" of certain results, examples, conjectures, etc. via many individual answers, each contributing one or a few instances. Such a question should typically be in Community Wiki mode (CW); after asking, please, flag for moderators attention requesting the question to be made CW.
5
votes
What's your favorite equation, formula, identity or inequality?
Cauchy integral formula
$$
f(z)=\frac{1}{2\pi i}\int_{\gamma}\frac{f(w)}{w-z} dw
$$
11
votes
Examples of common false beliefs in mathematics
When I was studying Banach spaces, I was confused with the following:
We know that, in any Banach Space $V$, the closed unit ball is compact in the topology generated by the norm if, and only if, the …
13
votes
Tools for collaborative paper-writing
There is a new project called Sharelatex the website is
www.sharelatex.com
It is a web application where the collaborators can edit the text at the same time.
We can get a free account to test the s …