Dear forum,
The following code used to worke fine, but after updating GAP it no longer
does. How can I construct a left ideal in a group algebra in the new GAP
release?
Thank you
Anvita
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GAP4, Version: 4.4.7 of 17-Mar-2006, i686-pc-cygwin-gcc
Components: small 2.1, small2 2.0, small3 2.0, small4 1.0, small5 1.0,
small6 1.0, small7 1.0, small8 1.0, small9 1.0, small10 0.2,
id2 3.0, id3 2.1, id4 1.0, id5 1.0, id6 1.0, id9 1.0, id10 0.1,
trans 1.0, prim 2.1 loaded.
Packages: TomLib 1.1.2 loaded.
gap> S:=SymmetricGroup(5);
Sym( [ 1 .. 5 ] )
gap> F:=GF(2);
GF(2)
gap> R:=GroupRing(F,S);
<algebra-with-one over GF(2), with 2 generators>
gap> e12:=Image(Embedding(S,R),(1,2));
(Z(2)^0)*(1,2)
gap> I:=R*e12;
<left ideal in <algebra-with-one over GF(2), with 2 generators>,
(1 generators)>
gap>
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GAP4, Version: 4.4.8 of 18-Sep-2006, i686-pc-cygwin-gcc
Components: small 2.1, small2 2.0, small3 2.0, small4 1.0, small5 1.0,
small6 1.0, small7 1.0, small8 1.0, small9 1.0, small10 0.2,
id2 3.0, id3 2.1, id4 1.0, id5 1.0, id6 1.0, id9 1.0, id10 0.1,
trans 1.0, prim 2.1 loaded.
Packages: AClib 1.1, Polycyclic 1.1, Alnuth 2.1.3, CrystCat 1.1.2,
Cryst 4.1.4, AutPGrp 1.2, CRISP 1.3.1, CTblLib 1.1.3,
TomLib 1.1.2, FactInt 1.4.11, FGA 1.1.0.1, GAPDoc 0.99999,
IRREDSOL 1.1.1, LAGUNA 3.3.3, Sophus 1.23, Polenta 1.2.3,
ResClasses 2.3.3 loaded.
gap> S:=SymmetricGroup(5);
Sym( [ 1 .. 5 ] )
gap> F:=GF(2);
GF(2)
gap> R:=GroupRing(F,S);
<algebra-with-one over GF(2), with 2 generators>
gap> e12:=Image(Embedding(S,R),(1,2));
(Z(2)^0)*(1,2)
gap> I:=R*e12;
Error, no method found! For debugging hints type ?Recovery from NoMethodFound
Error, no 2nd choice method found for `ResidueClassUnionCons' on 6 arguments c\
alled from
ResidueClassUnionCons( IsUnionOfResidueClasses, R, m, r, included, excluded
) called from
ResidueClassUnion( R, m, [ r ] ) called from
ResidueClass( R, x, Zero( x ) ) called from
<function>( <arguments> ) called from read-eval-loop
Entering break read-eval-print loop ...
you can 'quit;' to quit to outer loop, or
you can 'return;' to continue
brk>
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