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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.

6 votes

Which book would you like to see "texified"?

Leon Simon - Lectures on Geometric Measure Theory
2 votes

Proving theorems by using functions with fixed points.

I am familiar with a good example from the theory of 2nd order elliptic PDE. Technicalities omitted... A special case of the Leray-Schauder Theorem says the following: Let $T$ be a compact mapping o …
55 votes
17 answers
16k views

Computer science for mathematicians

This is a big-list community question, so I'm sorry in advance if it is deemed too soft but I haven't seen anything similar yet. I've seen computer scientists post questions looking to learn things …
6 votes

Ingenuity in mathematics

Mathematicians are used to seeing these sorts of problems and are generally more intrigued by their solutions, but I came across this recently: Colour every point in the plane either black or white. …
11 votes
5 answers
4k views

Brownian motion, martingales, Markov Chains - Rosetta Stone

What are the most fundamental/useful/interesting ways in which the concepts of Brownian motion, martingales and markov chains are related? I'm a graduate student doing a crash course in p …
0 votes

Applications of connectedness

You can get the maximum principle for subharmonic functions: Write $F$ for the supremum of $f$ in $\Omega$, write $A$ for the set where $f = F$ and $B$ for the set where $f < F$. Then $\Omega = A \cu …
8 votes

What is the definition of "canonical"?

I would say that "canonical" ought to be used to describe when no choices have been made. A nice example of a non-canonical identification: A principal bundle is made up of principal homogeneous spac …
34 votes
Accepted

Introductory text on Riemannian geometry

Personally, for the basics, I can't recommend John M. Lee's "Riemannian Manifolds: An Introduction to Curvature" highly enough. If you already know a lot though, then it might be too basic, because it …
138 votes

Most harmful heuristic?

Along the same lines as Qiaochu's and Zach's responses, the commonly taught heuristics pertaining to functions, differentiability and integration are a pet hate of mine. I certainly left school think …