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Jan
16
asked Sheaf cohomology of projective spaces
Dec
13
comment Derived functors and coboundary operator
@ZhenLin I'm not exactly sure what your point is, but as far as I understand, you can calculate group cohomology either from an injective resolution (which is difficult to find) or from a projective resolution with the Hom functor applied to the whole resolution.
Dec
13
comment Derived functors and coboundary operator
@ZhenLin In principle, yes. I added more details in the question body.
Dec
13
revised Derived functors and coboundary operator
added 1486 characters in body
Dec
12
comment Derived functors and coboundary operator
@ZhenLin Edited. Is this more clear?
Dec
12
revised Derived functors and coboundary operator
added 652 characters in body
Dec
12
asked Derived functors and coboundary operator
Nov
15
revised Cohomology of $\mathcal O(k)$
added 197 characters in body
Nov
15
awarded  Custodian
Nov
15
revised Cohomology of $\mathcal O(k)$
added 28 characters in body
Nov
15
reviewed Reviewed Is there a difference between the support and the support space of a d-dimensional complex matrix?
Nov
15
revised Solvable Lie algebra with codimension 1 ideal
added 56 characters in body
Oct
20
answered Orbit and Stabilizer
Sep
7
revised Cohomology of $\mathcal O(k)$
added 36 characters in body
Sep
7
comment Cohomology of $\mathcal O(k)$
@atricolf The total space of the bundle $\mathcal O(k)$.
Sep
7
asked Cohomology of $\mathcal O(k)$
Jul
7
comment Cell decomposition for connected sum
@DanielRust Thanks. Is the idea to use another Mayer-Vietoris sequence for the "punctured" manifolds, or is there another way to calculate their homology?
Jul
7
asked Cell decomposition for connected sum
Jul
7
accepted $\pi_0$ in the long exact sequence of a fibration and quaternionic projective space
Jul
7
comment $\pi_0$ in the long exact sequence of a fibration and quaternionic projective space
Oh, you're right. I mixed up Sp(1) with Spin(1). A simple dimension count should have shown this. Sorry for the confusion and thank you for your answer. The long exact sequence then allows me to calculate the homotopy groups (properly this time).