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Top Questions
11
votes
Set union in the category of sets
category-theory
asked Oct 17, 2015 at 15:20
math.stackexchange.com
10
votes
Why do Bourbaki define the characteristic of a ring the way they do?
abstract-algebra
ring-theory
definition
asked Jun 26, 2020 at 14:59
math.stackexchange.com
10
votes
Order of the product of two commuting elements with coprime orders in a group.
group-theory
asked Oct 14, 2013 at 22:30
math.stackexchange.com
9
votes
Natural transformations in $\textbf{Set}$
category-theory
asked Jun 9, 2013 at 15:56
math.stackexchange.com
9
votes
Proof of Cauchy-Schwarz inequality.
linear-algebra
asked Sep 29, 2012 at 17:52
math.stackexchange.com
8
votes
If the index $n$ of a normal subgroup $K$ is finite, then $g^n\in K$ for each $g$ in the group.
abstract-algebra
group-theory
asked Sep 30, 2013 at 14:28
math.stackexchange.com
8
votes
Nilradical of a graded ring
proof-verification
commutative-algebra
asked Apr 13, 2017 at 11:47
math.stackexchange.com
6
votes
Divisibility of polynomials in a subfield of a field.
abstract-algebra
polynomials
divisibility
asked Oct 13, 2014 at 14:35
math.stackexchange.com
6
votes
Homotopy between two functions to a circle.
homework
algebraic-topology
asked Jan 19, 2014 at 17:53
math.stackexchange.com
5
votes
Domain with a minimal left ideal is a division ring.
abstract-algebra
ring-theory
asked Mar 3, 2014 at 19:52
math.stackexchange.com
1
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Top Answers
5
Does there exist a smooth function which is nowhere analytic?
math.stackexchange.com
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