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Homotopy theory, homological algebra, algebraic treatments of manifolds.

6 votes

Grothendieck spectral sequence and Mayer-Vietoris sequence

Here is a slightly different argument than algori's, not using the construction of the Čech-to-derived functor spectral sequence and only using $E_2$ terms, not $E_1$ terms. As you say, the spectral …
Ingo Blechschmidt's user avatar