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seen Apr 17 at 10:35

Apr
22
awarded  Popular Question
Apr
30
accepted The action of the group of deck transformation on the higher homotopy groups
Apr
29
awarded  Editor
Apr
29
revised The action of the group of deck transformation on the higher homotopy groups
edited body
Apr
29
asked The action of the group of deck transformation on the higher homotopy groups
Dec
18
awarded  Teacher
Dec
16
awarded  Scholar
Dec
16
awarded  Supporter
Dec
16
accepted Cancellation law of morphisms?
Dec
16
comment Cancellation law of morphisms?
Ah, but of course... This holds for any two projective modules and any $M$ with two such epimorphisms described, so it couldn't be too strong an implication. I guess I'll sit down and look at some examples a little more, untill I start to get a better grasp of it...
Dec
16
comment Cancellation law of morphisms?
Let me see if I got this straight: What I do get is that $P \oplus \ker{\psi} \cong Q \oplus \ker{\varphi}$? It just feels like I should get something "stronger" than that (or maybe I just don't realize the full imlpications of this result yet :) ), but it feels like I ought to be able to say more...
Dec
16
asked Cancellation law of morphisms?
Nov
5
comment Difference between simplicial and singular homology?
Thanks! I've tried to sum up my (new) understanding of these two concepts in an answer below, mostly to check if I've understood everything correct.
Nov
5
answered Difference between simplicial and singular homology?
Nov
4
awarded  Analytical
Nov
4
comment Difference between simplicial and singular homology?
Ah, I think I understand. Just to clarify one thing; when in the framework of singular homology do you then (have to) consider all possible maps $\Delta^n \to X$, or do you just choose some covering of $X$?
Nov
4
awarded  Student
Nov
4
asked Difference between simplicial and singular homology?