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for questions about fiber bundles, including structure groups, principal bundles, and spaces of sections.

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
8 votes

Reducible 3d torus bundles

OK, time to give some references for this classical material. Orientable 3-manifolds that are torus bundles are classified up to diffeomorphism by the conjugacy class of their monodromy map in SL(2,Z) …
Allen Hatcher's user avatar