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Bjorn Poonen's user avatar
Bjorn Poonen's user avatar
Bjorn Poonen
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question
294
Polynomial representing all nonnegative integers
Dec 25, 2009
answer
106
Conceptual reason why the sign of a permutation is well-defined?
Mar 9, 2022
answer
97
Experimental mathematics leading to major advances
Jan 17, 2010
answer
77
Is there an "elementary" proof of the infinitude of completely split primes?
Feb 14, 2010
answer
76
Polynomial with the primes as coefficients irreducible?
Mar 14, 2010
question
63
Smooth proper scheme over Z
Dec 23, 2009
answer
55
How can I define the product of two ideals categorically?
Feb 9, 2010
answer
49
Expected determinant of a random NxN matrix
Jan 26, 2010
answer
48
Intuition for the last step in Serre's proof of the three-squares theorem
Dec 31, 2009
question
47
Collapsible group words
Feb 15, 2010