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Mathematics
Tim Seifert's user avatar
Tim Seifert's user avatar
Tim Seifert's user avatar
Tim Seifert
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17
Combinatorial proof, without axiom of choice, that for any set $A$, there is no surjection from $A^2$ to $3^A$
Mar 24
17
Is there a dense subset of the rationals (between 0 and 1) that doesn't include its midpoints?
Apr 22
12
What axioms are needed to show that every vector space has a "coordinate system"?
Mar 1
9
Does there exist a group $G$ such that $\operatorname{Aut}(G)\cong D_5$, where $D_5$ denotes the dihedral group of order 10?
Jul 8
7
Autocommutator subgroup is a characteristic subgroup
Jan 11
6
Dual space of $\mathcal{P}(M)$, when regarded as an $\mathbb{F}_2$-vector space.
May 31, 2023
6
When is the Cayley embedding for infinite groups optimal?
Feb 21
6
Proving an algebraic problem categorically
Nov 30, 2023
6
Group extension analogous to the symmetric group.
Mar 12
5
Group homomorphism between multiplicative groups of fields
Jun 18
Top network posts
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30
Can White still castle?
25
How did White lose all their pieces?
19
Catching a Cat on an infinite Line
17
Can White still castle? #2
13
Can you solve the fates of the missing chess pieces?