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Identifier
Values
=>
Cc0022;cc-rep
['A',1]=>2 ['A',2]=>3 ['B',2]=>3 ['G',2]=>4 ['A',3]=>4 ['B',3]=>5 ['C',3]=>4 ['A',4]=>5 ['B',4]=>7 ['C',4]=>5 ['D',4]=>6 ['F',4]=>9 ['A',5]=>6 ['B',5]=>9 ['C',5]=>6 ['D',5]=>8 ['A',6]=>7 ['B',6]=>11 ['C',6]=>7 ['D',6]=>10 ['E',6]=>12 ['A',7]=>8 ['B',7]=>13 ['C',7]=>8 ['D',7]=>12 ['E',7]=>18 ['A',8]=>9 ['B',8]=>15 ['C',8]=>9 ['D',8]=>14 ['E',8]=>30
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Description
The dual Coxeter number of a finite Cartan type.
References
[1] Humphreys, J. What role does the "dual Coxeter number" play in Lie theory (and should it be called the "Kac number")? MathOverflow:25592
Code
def statistic(C):
    return C.dual_coxeter_number()

Created
Apr 20, 2018 at 20:27 by Martin Rubey
Updated
Apr 20, 2018 at 20:27 by Martin Rubey