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seen Jan 7 '13 at 14:37

Jan
4
comment Order of elements
This is the famous "r-s-t" problem assigned to first year graduate students at the University of Chicago out of Alperin-Bell, which intentionally contains many highly nontrivial problems mixed among the easy ones, older grad students are sworn to secrecy as to which are which. We all spent hours trying to solve it inside the symmetric group using multiple different special cases. Only one or two students in history were known to get it correct, and it is easier to do inside PSL. It saddens me to see the answer posted here.
Nov
20
awarded  Nice Answer
Sep
20
comment Non-isomorphic finite simple groups
The $A_8 \cong GL(4,2)$ example is well-known at the University of Chicago where it's an exercise in Alperin-Bell, the idea being students shouldn't know if an exercise is hard or easy in advance. That and the famous "rst" problem have tormented many a 1st year grad student.
Jun
19
answered Order of automorphism of Projective special linear group
Jun
19
awarded  Critic
Jun
14
comment searching for text for studying representation theory
I taught a 1-semester class for seniors/1st year grad students out of this book and they all really enjoyed it. It should be very suitable for self study as well.
Jun
12
comment Heuristic argument that finite simple groups _ought_ to be “classifiable”?
Can someone explain the mysterious last sentence in this answer?
May
30
answered When (if ever) disclose your identity as a reviewer?
Feb
24
awarded  Supporter
Feb
24
answered indecomposable modules of the symmetric group
Feb
20
awarded  Editor
Feb
20
revised Restrictions of Modules and Dimensions
deleted 4 characters in body
Feb
20
answered Restrictions of Modules and Dimensions
Jun
29
awarded  Necromancer
Jun
15
awarded  Teacher
Jun
15
answered What are some examples of colorful language in serious mathematics papers?