List questions from projective-module | MathQa

Projective resolutions of modules in a short exact sequence (Dummit & Foote Proposition 17.1.7)

Published on 29 Dec 2024 - 15:51

In which algebraic theories do 'free' and 'projective' coincide?

Published on 13 Jan 2025 - 1:05

Projective but not free module over groupring

Published on 12 Jan 2025 - 10:06

Trouble calculating projective modules

Published on 13 Jan 2025 - 0:49

Direct sums of modules versus products

Published on 13 Jan 2025 - 0:49

Two quotients of projective modules are equal, prove the crossed direct sums of the projective modules and kernels are isomorphic. (Schanuel's Lemma)

Published on 12 Jan 2025 - 10:06

Proving $\Bbb Z_p$ has no projective cover.

Published on 13 Jan 2025 - 0:49

If $P$ is projective and $A,B$ are direct summands of $P$ then $A\cap B$ is a direct summand of $P$

Published on 13 Jan 2025 - 1:15

Help/Verification of Ext group calculation

Published on 13 Jan 2025 - 0:54

Different definition of $K_0(R)$. Prove equivalence

Published on 12 Jan 2025 - 9:57