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A129520 Orders of symmetric groups associated with the exceptional groups G2, F4, E6, E7, E7.5, E8, E9 (or better? E11): A_3, S_3, A_4, S_5, "? ", A_5, S_5. 0
3, 6, 24, 40, 60, 120 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
The calculation by hand based on dimensions of: Dim_Ex(i)-n(i)*Dim_Symm(i)=small_integer The groups E7.5 and E9 are better thought of as E7.6 and E11 when integer results are wanted. The "?" question mark group is a symmetrical group between s4 and A5 with dimension 40; it is not in any of the books I have or on the web as far as I can find by searching.
REFERENCES
Gareth Jones and David Singerman, Bull. London Math Soc. 28, (1996) pages 561-590 ( A_4, S_4, A_5 on p585)
LINKS
EXAMPLE
14-4*3=2
52-8*6=4
78-5*12=6
133-5*24=13
190-4.6*40=6
248-4*60=8
484-4*120=4
Example:
DimEx(E7.6)/Dim_cartan=190/7.6=25
DimEx(E11)/Dim_cartan=484/11=44
which fit in the sequence of the traditional exceptional groups A118889
as:3, 7, 13, 13, 19, 25, 31,44
CROSSREFS
Cf. A118889.
Sequence in context: A101738 A083525 A106213 * A330300 A047167 A271428
KEYWORD
nonn,uned,obsc
AUTHOR
Roger L. Bagula, May 28 2007
EXTENSIONS
Partially edited by N. J. A. Sloane, May 15 2010
STATUS
approved

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Last modified July 14 05:06 EDT 2024. Contains 374291 sequences. (Running on oeis4.)