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Jan
20
asked If $\operatorname{dim} M > \operatorname{dim} N$, is there an injective smooth map $M\to N$?
Jan
17
asked When do regular values form an open set?
Jan
11
answered Dual notion of free module
Nov
30
answered $\mathrm{Spec}(R)\!=\!\mathrm{Max}(R)\!\cup\!\{0\}$ $\Rightarrow$ $R$ is a PID
Nov
24
answered Freyd-Mitchell's embedding theorem
Nov
24
asked Are fixed fields of finite subgroups generated by symmetric polynomials on Galois conjugates?
Nov
2
asked Proving the class number of $\mathbb{Q}(\sqrt{-5})$ is 2 using Ireland-Rosen's bound
Oct
5
answered Splicing together Short Exact Sequences
Sep
4
answered Abstract nonsense proof of the cocompleteness of the category of groups
Aug
9
asked Abstract nonsense proof of the cocompleteness of the category of groups
Jul
19
answered Graph $y=1/\sin x$
Jul
19
answered Why is associativity required for groups?
May
11
answered Codomains, products and limits
Apr
30
asked Explicit isomorphism $\tilde{H_n}(X)\simeq \tilde{H}_{n+1}(SX)$.
Apr
21
asked Examples of comma categories
Apr
15
answered Ideal as a projective module
Mar
17
asked What is the probability that a solitaire game be winnable?
Feb
19
asked $\mathbb{Z}$ is a defective ring
Feb
10
asked Some questions about the Tor functor as a two-variable functor related to the arbitrary character of the choice of projective resolutions
Feb
2
answered linear maps $\mathbb{R} \to \mathbb{R}$ are bijective or zero