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seen Nov 25 '13 at 21:09

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comment What restricts the number of cohomologies?
@Akhil: Thanks a lot!
Jan
6
comment What restricts the number of cohomologies?
I'm guessing that the blue book is Stable homotopy theory? Thanks anyway!
Jan
6
comment What restricts the number of cohomologies?
This is a bit off-topic, but if I want to understand more about these stuff (motivation for spectrum, Poincare duality etc), where should I look?
Jan
5
comment Basic example of extensions of residue fields.
Consider a function field galois extension such that a prime is totally ramified, then complete with respect to that prime.
Dec
28
comment Read old articles instead books.
OP is asking for old articles, not encyclopediaeic sources.
Dec
25
comment Symmetric $k$-tensor
In the blog post you mentioned there is actually an example of symmetric tensor at the end.
Dec
12
comment Preparation for a modular forms course
It may be a good idea to see what modular forms are about first. Read for example, Chapter 7 of Serre's A course in arithmetic. I think that would give a very good idea of what the first 5 chapters of Diamond and Shurman are about.