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Jim Humphreys's user avatar
Jim Humphreys's user avatar
Jim Humphreys's user avatar
Jim Humphreys
  • Member for 14 years, 9 months
  • Last seen more than 4 years ago
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About

Jim Humphreys (1939-2020)

More-or-less retired professor at UMass Amherst. Basically an algebraist with interests in Lie theory, specifically representation theory and related algebraic geometry.
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answer
85
Motivating the Casimir element
Sep 7, 2011
question
73
What are "classical groups"?
Dec 28, 2010
question
65
Origin of terms "flag", "flag manifold", "flag variety"?
Mar 13, 2011
question
52
Is Galois theory necessary (in a basic graduate algebra course)?
Aug 1, 2010
answer
51
Books you would like to read (if somebody would just write them…)
Jan 30, 2011
question
50
What role does the "dual Coxeter number" play in Lie theory (and should it be called the "Kac number")?
May 22, 2010
answer
48
Fraktur symbols for Lie algebras
Mar 1, 2012
answer
47
What is significant about the half-sum of positive roots?
Nov 5, 2011
question
46
Definition of "finite group of Lie type"?
Jul 16, 2013
answer
45
Fields of mathematics that were dormant for a long time until someone revitalized them
May 11, 2010