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48 votes

Spectral sequences: opening the black box slowly with an example

Two simple examples with lots of interesting differentials are given by the Serre spectral sequences for integer homology (rather than cohomology) for the fibrations $$K({\mathbb Z}_2,1) \to K({\mathb …
Allen Hatcher's user avatar
11 votes
Accepted

Convergence of spectral sequences of cohomological type

The lemma you refer to has two halves. The first half covers the case of homology and the second half covers the case of cohomology. Proofs are given for both halves (though the last sentence of the …
Allen Hatcher's user avatar
8 votes
Accepted

Cup product of cohomology in a Serre spectral sequence

Maybe the simplest example is the following. There are two fiber bundles with base and fiber both $S^2$. One is the product $S^2\times S^2$ and the other consists of two copies of the mapping cylinder …
Allen Hatcher's user avatar
1 vote

Multiplicative structure in the cohomological Leray-Serre spectral sequence - please elucida...

If it's commutativity of the diagram at the bottom of page 26 that you are worried about, this is just a formality. For convenience, insert another arrow into the diagram going from the middle group …
Allen Hatcher's user avatar