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Questions that are about research in mathematics, or about the job of a research mathematician, without being mathematical problems or statements in the strictest sense. Do not use this tag for easy or supposedly easy mathematical questions.

3 votes

when will the surfficient large power of a rational matrix be a integer matrix?

They are not equivalent. Take a (15,8,8) design ( or the 15 by 15 0-1 matrix associated with the order 16 Sylvester-Hadamard matrix ). Multiply all elements by 1/2, and call the result A. AA is an i …
The Masked Avenger's user avatar
5 votes

Parodies of abstruse mathematical writing

I recommend the book A Random Walk In Science. That should keep you busy for a while.