6
votes
Accepted
Codimension zero embeddings and maps with small fibers
Isn't the following an example?
Build $M$ starting from the plane by attaching an infinite sequence of handles whose size decreases to zero.
Take for $N$ the disjoint union of $M_k$, where $M_k$ is ...
- 2,772
2
votes
Construction of the Mayer-Vietoris spectral sequence
Here is a purely algebro-topological way of obtaining the Mayer–Vietoris spectral sequence for any homology theory $h_{\bullet}$ (the cohomological version is analogous). It is obtained by combining ...
- 508
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