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Top Questions
73
votes
Still Difficult After All These Years
soft-question
gm.general-mathematics
big-list
asked Nov 2, 2010 at 17:42
mathoverflow.net
51
votes
Metamathematics of buts
lo.logic
mathematical-philosophy
asked Jan 19, 2021 at 14:11
mathoverflow.net
31
votes
Early two-author math papers
reference-request
ho.history-overview
big-list
asked Feb 20, 2011 at 20:30
mathoverflow.net
24
votes
Aleph 0 as a large cardinal
set-theory
large-cardinals
asked Nov 9, 2010 at 15:44
mathoverflow.net
14
votes
The Practical Impact of Set-Theoretic Axioms on Measure Theory
descriptive-set-theory
measure-theory
asked Dec 31, 2012 at 9:37
mathoverflow.net
12
votes
Axiom of Replacement in Category Theory
ct.category-theory
set-theory
asked Oct 5, 2010 at 8:59
mathoverflow.net
9
votes
Self-dual Complete Category
ct.category-theory
asked Jan 15, 2011 at 21:35
mathoverflow.net
8
votes
Can every set be measurable?
set-theory
lo.logic
measure-theory
asked May 1, 2019 at 11:31
mathoverflow.net
8
votes
Small Implications of the Axiom of Replacement
set-theory
lo.logic
asked Jan 13, 2013 at 15:10
mathoverflow.net
8
votes
Pullback-stability for epimorphisms
category-theory
asked Dec 30, 2010 at 21:20
math.stackexchange.com
1
2
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Top Answers
47
Who made the famous error in calculation that 'wasted' the final years of his life?
mathoverflow.net
43
Siegel zeros and other "illusory worlds": building theories around hypotheses believed to be false
mathoverflow.net
42
Books on Number Theory for Layman
math.stackexchange.com
27
On mathematical aspects of the most recent Nobel Prize in economics winners' work
mathoverflow.net
25
Abstract definition of convex set
mathoverflow.net
24
Category of all categories vs. Set of all sets
math.stackexchange.com
22
Interpretation of the action in classical mechanics
mathoverflow.net
22
Why is Lebesgue measure theory asymmetric?
mathoverflow.net
21
Conway's lesser-known results
mathoverflow.net
21
What are some examples of colorful language in serious mathematics papers?
mathoverflow.net
19
Why are so few operations with arity bigger than 2?
mathoverflow.net
17
Free division rings?
mathoverflow.net
15
Advantages of diffeological spaces over general sheaves
mathoverflow.net
12
What advanced area of mathematics can be delved into with only basic calculus and linear algebra
mathoverflow.net
12
Never appeared forthcoming papers
mathoverflow.net
11
What is the opposite category of $\operatorname{Top}$?
math.stackexchange.com
11
The intuition of the dual space?
math.stackexchange.com
11
Finite dimensional division algebras over the reals other than $\mathbb{R},\mathbb{C},\mathbb{H},$ or $\mathbb{O}$
math.stackexchange.com
10
Algebraic geometry additionally equipped with field automorphism operation
mathoverflow.net
10
Difference between 'generalized gradient' and 'subgradient' ?
mathoverflow.net
9
Why are finite simple groups useful?
mathoverflow.net
9
Reference Request: Independence of the ultrafilter lemma from ZF
mathoverflow.net
9
Why is it O(1) (and not, say, O(2))?
cs.stackexchange.com
9
Defining Multiplication in Polynomials over Rings of Matrices
mathoverflow.net
8
Independence of P = NP?
mathoverflow.net
8
"Let $x \in A$", beginning a proof of "$\forall x \in A$ ...", if A were empty
mathoverflow.net
8
What are the elements of $k[X,Y]/(X^2-Y^3)$ like?
math.stackexchange.com
7
Mathematics with the negation of AC
mathoverflow.net
7
How to make Ext and Tor constructive?
mathoverflow.net
7
Semigroup analogue to the classification of finite simple groups?
math.stackexchange.com
1
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