Dear GAP people,
I'm using GAP 4.7.4 on arch linux 64 bit. Let
G:=AtlasGroup("M22.2");
S:=SylowSubgroup(G,7);
N:=Normalizer(G,S);
Size(N); # =42
Then the command HallSubgroup(N,[2,3]); works *sometimes*, but other
times I get "Error, depths are not compatible with parent pcgs".
Apparently, this is related to the initialization of G. Try:
for i in [1..10] do
Print(i,"\n");
G:=AtlasGroup("M22.2");
S:=SylowSubgroup(G,7);
N:=Normalizer(G,S);
HallSubgroup(N,[2,3]);
od;
Best wishes,
Benjamin
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