On Tue, Mar 29, 2011 at 08:16:53AM -0700, Daniel Bump wrote: > When the Dynkin diagram has a nontrivial automorphism (of order > two except D4), the map alpha -> -w0(alpha) may or not > coincide with this automorphism. ... > Here there is a non-trivial graph automorphism but this > isn't it. Therefore it seems to me that dynkin_diagram_automorphism > is not such a good name for this permutation of the indices.
The standard name in the literature for the automorphism (which may be trivial) induced by -w0 is "the opposition automorphism" Best regards, ------------------------------------------------------------------------ Jean MICHEL, Equipe des groupes finis, Institut de Mathematiques UMR7586 Bureau 9D17 tel.(33)157279144, 175, rue du Chevaleret 75013 Paris -- You received this message because you are subscribed to the Google Groups "sage-combinat-devel" group. To post to this group, send email to sage-combinat-devel@googlegroups.com. To unsubscribe from this group, send email to sage-combinat-devel+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sage-combinat-devel?hl=en.
