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Mathematics
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Jxt921
  • Member for 9 years, 3 months
  • Last seen more than 2 years ago
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12
$\ker \phi = (x_1-a_1, ..., x_n-a_n)$ for a ring homomorphism $\phi: R[x_1, ..., x_n] \to R$
Jul 10, 2016
11
Every subgroup of a quotient group is a quotient group itself
Jan 10, 2016
10
$gh = hg, \ \gcd(|g|, |h|) = 1\Rightarrow|gh| = |g||h|\ \ (|a|$ = order of element $a)$
Jun 22, 2016
10
Understanding divison by monic polynomial in $R[x]$ where $R$ is an arbitrary ring
Jun 3, 2016
9
Pushout in the category of Sets: proof
Dec 1, 2018
9
Proving Laplace expansion using exterior algebra
Oct 6, 2019
9
Monoidal categories: coherence from strictness
Dec 17, 2019
7
Monoidal functor and the units II
Dec 9, 2019
6
The center of $A_n$ is trivial for $n \geq 4$
Aug 1, 2016
6
The forgetful functor from a category of elements strictly creates limits and connected colimits
Jan 7, 2019
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55
How should a "working mathematician" think about sets? (ZFC, category theory, urelements)
19
Large categories vs. $\mathrm{U}$-categories: why is the loss of category-theoretic information inessential?
13
What is the use of Grothendieck universes in category theory?
12
Translating Grothendieck axiom UB into ZFC
10
How do top graduate programs in mathematics verify the validity of an enrollee's undergraduate degree from abroad? E.g. IUM in Russia