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Wilberd van der Kallen's user avatar
Wilberd van der Kallen's user avatar
Wilberd van der Kallen's user avatar
Wilberd van der Kallen
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All Questions Answers
Score Newest
answer
36
Conceptual reason why the sign of a permutation is well-defined?
Mar 11, 2022
answer
35
How to prove this polynomial always has integer values at all integers?
Sep 18, 2015
answer
20
Universal cover of SL2(R) admits no central extensions?
May 1, 2011
answer
14
Is Lusztig's conjecture solved?
Mar 28, 2010
answer
14
Tensor product of rings of Witt vectors
Mar 4, 2011
answer
13
Invariants of matrices (by simultaneous $\mathrm{GL}_n$ conjugation) over arbitrary rings
Sep 8, 2021
answer
11
Non-finite version of Nakayama's lemma?
Jul 27, 2010
answer
10
Question about the representation theory of SL(n,Z)
Mar 21, 2011
answer
9
Proper subgroup of GL(n,Z) isomorphic to GL(n,Z)?
Sep 16, 2010
answer
9
Normalizer of SL_2(Z) in GL_2(R)
Feb 21, 2014
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