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History and philosophy of mathematics, biographies of mathematicians, mathematics education, recreational mathematics, communication of mathematics.

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Is there something I am missing about the computation of the $p$-part of the class groups of...

[Rather than leaving the comment "Class number formula" for Olivier as a comment, I expand it for other readers of the question, to a partial answer.] Kummer knew in 1850 that the class group of $\mat …
Chris Wuthrich's user avatar