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This tag is used if a reference is needed in a paper or textbook on a specific result.
18
votes
2
answers
2k
views
Clean Proofs of Properties of Projective Space
How far can one go in proving facts about projective space using just its universal property?
Can one prove Serre's theorem on generation by global sections, calculate cohomology, classify all invert …
3
votes
1
answer
1k
views
Finite subgroups of SO(3)
There are several proofs of the famous classification of finite subgroups of $SO(3)$. I heard that there is a "purely algebraic" one attributed to Camille Jordan. Does anybody know of a reference?
Th …