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Questions about abstract measure and Lebesgue integral theory. Also concerns such properties as measurability of maps and sets.

15 votes
5 answers
17k views

Proving "almost all matrices over C are diagonalizable".

This is an elementary question, but a little subtle so I hope it is suitable for MO. Let $T$ be an $n \times n$ square matrix over $\mathbb{C}$. The characteristic polynomial $T - \lambda I$ splits …
Anweshi's user avatar
  • 7,442
19 votes
9 answers
6k views

Haar measure on a quotient, References for

I remember reading Weil's "Basic Number Theory" and giving up after a while. Now I find myself thinking of it (thanks to some comments by Ben Linowitz). Right from the very beginning, Weil uses the fa …
Anweshi's user avatar
  • 7,442
75 votes
4 answers
23k views

Non-Borel sets without axiom of choice

This is a simple doubt of mine about the basics of measure theory, which should be easy for the logicians to answer. The example I know of non Borel sets would be a Hamel basis, which needs axiom of …
Anweshi's user avatar
  • 7,442