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This tag is used if a reference is needed in a paper or textbook on a specific result.

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 …
Mikhail Gudim's user avatar
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 …
Mikhail Gudim's user avatar