Todd Trimble

http://www.topologicalmusings.wordpress.com

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Is there a nice proof that $123456789098765432111$ is prime?

elementary-number-theory prime-numbers recreational-mathematics asked Sep 13, 2013 at 4:38

math.stackexchange.com

45 votes

Good references for Rigged Hilbert spaces?

mp.mathematical-physics sp.spectral-theory rigged-hilbert-spaces asked Oct 23, 2010 at 16:37

mathoverflow.net

38 votes

Does "compact iff projections are closed" require some form of choice?

gn.general-topology lo.logic asked Oct 14, 2010 at 18:00

mathoverflow.net

34 votes

Cantor's theorem for presheaves?

ct.category-theory asked Dec 21, 2014 at 15:13

mathoverflow.net

28 votes

What are retracts of polynomial rings?

ac.commutative-algebra polynomials asked Oct 4, 2015 at 2:21

mathoverflow.net

23 votes

Surreal Numbers as Inductive Type?

surreal-numbers type-theory ct.category-theory asked Apr 29, 2011 at 3:21

mathoverflow.net

23 votes

Monotone functions are differentiable a.e. and Hilbert's Fifth Problem: what's the connection?

lie-groups ca.analysis-and-odes hilbert-spaces asked Nov 1, 2010 at 18:26

mathoverflow.net

22 votes

Idempotents split in category of smooth manifolds?

ct.category-theory differential-topology asked Apr 5, 2014 at 20:28

mathoverflow.net

19 votes

Who first introduced the notation $\mathcal{O}$ in algebraic geometry or algebraic number theory

mathematics notation number-theory algebraic-geometry asked Oct 14, 2015 at 15:57

hsm.stackexchange.com

18 votes

Group which "resembles" the free product of a cyclic group of order two and a cyclic group of order three, but isn't.

gr.group-theory asked Oct 12, 2010 at 17:30

mathoverflow.net

Top Answers

144

Why is differentiating mechanics and integration art?

mathoverflow.net

116

What's a mathematician to do?

mathoverflow.net

"Mathematics talk" for five year olds

mathoverflow.net

Why do categorical foundationalists want to escape set theory?

mathoverflow.net

Duality between compactness and Hausdorffness

mathoverflow.net

Do these properties characterize differentiation?

mathoverflow.net

Why is differentiating mechanics and integration art?

mathoverflow.net

How should one think about non-Hausdorff topologies?

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Elementary+Short+Useful

mathoverflow.net

Intuition for coends

mathoverflow.net

Completion of a category

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Is a vector space naturally isomorphic to its dual?

mathoverflow.net

Fundamental groups of topological groups.

mathoverflow.net

Is $π$ definable in $(\Bbb R,0,1,+,×,<,\exp)$?

mathoverflow.net

What is the opposite category of $Set$?

math.stackexchange.com

Under what conditions the quotient space of a manifold is a manifold?

math.stackexchange.com

"A gentleman never chooses a basis."

mathoverflow.net

Examples of categorification

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What is $\gcd(0,0)$?

math.stackexchange.com

Conway's lesser-known results

mathoverflow.net

Is amateur research in mathematics viable?

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Lawvere theories versus classical universal algebra

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Grothendieck's Homotopy Hypothesis - Applications and Generalizations

mathoverflow.net

Dimension of infinite product of vector spaces

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Is a come back to mathematical research possible?

mathoverflow.net

Why did Bourbaki's Élements omit the theory of categories?

mathoverflow.net

An example of a proof that is explanatory but not beautiful? (or vice versa)

mathoverflow.net

Examples of common false beliefs in mathematics

mathoverflow.net

Dimensional Analysis in Mathematics

mathoverflow.net

What are your favorite concrete examples of limits or colimits that you would compute during lunch?

mathoverflow.net