Davide Ferrario wrote
I'm working on some small programs in gap, and I have the following 2 questions:
(I'm running a gap4r1 bugfix 1 version, compiled on a linux box
i686-pc-linux-gnu-gcc, with pargapmpi installed)
1. Consider the following strange behavior:---BEGIN gap> G:=DihedralGroup(6); <pc group of size 6 with 2 generators> gap> tm:=TableOfMarks(G); TableOfMarks( Group( [ f1, f2 ] ) ) gap> H:=RepresentativeTom(tm,2); Group([ f2 ]) gap> th:=CharacterTable(H); CharacterTable( Group([ f2 ]) ) gap> Size(H); 2 gap> SizesConjugacyClasses(th); [ 1, 2/3, 2/3 ] [...] ---END
What am I doing wrong? What does it mean? How can I avoid this problem?
The above behaviour is due to a bug in the code for tables of marks.
It may happen that the two arguments of `RepresentativeTom' refer to
different orderings of subgroups, which leads to inconsistencies;
For example, the group `H' that claims to have order 2 has in fact order 3.
This will be corrected with the next bugfix.
Thanks for reporting this bug.