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Results tagged with at.algebraic-topology
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user 2203
Homotopy theory, homological algebra, algebraic treatments of manifolds.
29
votes
4
answers
2k
views
Geometric interpretation of the lower central series for the fundamental group?
For any group $G$ we can form the lower central series of normal subgroups by taking $G_0 = G$, $G_1 = [G,G]$, $G_{i+1} = [G,G_i]$. We can check this gives a normal chain
$$G_0 \ge G_1 \ge ... \ge G_i …
- 63.9k
28
votes
5
answers
4k
views
Modern source for spectra (including ring spectra)
I am looking for a modern introduction to spectra that improves on the treatment by Adams in his "Stable Homotopy and Generalized Homology" notes (by improves I mean taking into account what has been …
- 1,969