PositionId( W )
PositionSgn( W )
return the position of the trivial and the sign character, respectively, in the character table of the group W.
gap> W := CoxeterGroup( "D", 4 );; gap> PositionId( W ); 13 gap> PositionSgn( W ); 4
PositionId, one could also give an arbitrary finite group or its
character table as argument.
See also ChevieClassInfo.
This function requires the package "chevie" (see RequirePackage).
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