[GAP Forum] Strange GAP, III

[Thomas Breuer]

Dear GAP Forum,

Anvita wrote

> GAP sometimes fails to find class fusions for character tables one of
> which is modular:
> 
> -------------------------------------
> c1:=CharacterTable(CyclicGroup(12));
> c2:=CharacterTable("U3(11)");
> PossibleClassFusions(c1,c2);           # This line works fine (both
> tables ordinary)
> PossibleClassFusions(c1, c2 mod 11 );  # This one returns the following error:
> -------------------------------------
> 
> Error, no method found! For debugging hints type ?Recovery from NoMethodFound
> [...]

The function `PossibleClassFusions' is not defined for the case
that one argument is a Brauer table and the other is an ordinary table,
see the GAP Reference Manual.

In the example shown above, the following should work.

   PossibleClassFusions( c1 mod 11, c2 mod 11 );

All the best,
Thomas Breuer