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For questions requesting examples of a certain structure or phenomenon

7 votes

Examples of theorems with proofs that have dramatically improved over time

The first proof of the Hopf invariant one theorem due to Adams is very technical. It involves decomposing $sq^{2^n}$ as a composite of secondary cohomology operations when $n\geq 4$. Then Atiyah and A …
Sean Tilson's user avatar
  • 3,726
15 votes
1 answer
1k views

Comodule exercises desired

I am curious if anyone knows of some lecture notes, a text or fun little toy examples that i could work on. … So if you have: 1. the name of a text that has lots of examples that it works through, essentially something that tries to correct for Moore's first point, or 2. a list of examples to work through, like …