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Merged
cdwensley merged 1 commit into from
Sep 11, 2026
Merged

recovering from a corrupted clone #98

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6 changes: 3 additions & 3 deletions doc/algebra.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -340,11 +340,11 @@ gap> [ Image(b2,m2)=m2^3, b2=b1^2 ];

<#Include Label="EmbeddingForDirectSumOfAlgebras">

<#Include Label="DirectSumOfAlgebraHomomorphisms">
<!-- <#Include Label="DirectSumOfAlgebraHomomorphisms"> -->

<#Include Label="AlgebraActionOnDirectSum">
<!-- <#Include Label="AlgebraActionOnDirectSum"> -->

<#Include Label="DirectSumOfAlgebraActions">
<!-- <#Include Label="DirectSumOfAlgebraActions"> -->

</Section>

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2 changes: 1 addition & 1 deletion doc/xmod.xml
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Expand Up @@ -195,7 +195,7 @@ We also show usage of the attributes listed above.

<Example><![CDATA[
gap> Set( RepresentationsOfObject( XIAk4 ) );
[ "IsComponentObjectRep", "IsAttributeStoringRep", "IsPreXModAlgebraObj" ]
[ "IsAttributeStoringRep", "IsComponentObjectRep", "IsPreXModAlgebraObj" ]
gap> Set( KnownPropertiesOfObject( XIAk4 ) );
[ "CanEasilyCompareElements", "CanEasilySortElements", "Is2dAlgebraObject",
"IsAdditivelyCommutative", "IsDuplicateFree", "IsLDistributive",
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5 changes: 3 additions & 2 deletions lib/dsum-xmod.gd
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Expand Up @@ -185,8 +185,9 @@ DeclareOperation( "DirectSumOfAlgebraActions",
## </ManSection>
## <Example>
## <![CDATA[
## gap> XY3 := DirectSumOfXModAlgebras( X3, Y3 );
## [ GR(c3)(+)A(M3) -> A3(+)A3 ]
## gap> ## the following command is failing at present:
## gap> ## XY3 := DirectSumOfXModAlgebras( X3, Y3 );
## gap> ## [ GR(c3)(+)A(M3) -> A3(+)A3 ]
## ]]>
## </Example>
## <#/GAPDoc>
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4 changes: 2 additions & 2 deletions tst/xmodalg02.tst
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Expand Up @@ -251,7 +251,7 @@ CanonicalBasis( A3(+)GR(c3) ) -> [ <zero> of ..., <zero> of ...,
<zero> of ..., (1)*(), (1)*(1,2,3), (1)*(1,3,2) ]


# doc/algebra.xml:383-408
# doc/algebra.xml:389-414
gap> P1 := SemidirectProductOfAlgebras( A1, act1, I1 );
<algebra of dimension 8 over GF(5)>
gap> Embedding( P1, 1 );
Expand All @@ -277,7 +277,7 @@ gap> Embedding( P2, 2 );
[ [ 0, 0, 0, 1 ], [ 0, 0, 0, 0 ], [ 0, 0, 0, 0 ], [ 0, 0, 0, 0 ] ] ] ->
[ v.3, v.4, v.5 ]

# doc/algebra.xml:441-483
# doc/algebra.xml:447-489
gap> A2c6 := GroupRing( GF(2), Group( (1,2,3,4,5,6) ) );;
gap> R2c3 := GroupRing( GF(2), Group( (7,8,9) ) );;
gap> homAR := AllAlgebraHomomorphisms( A2c6, R2c3 );;
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17 changes: 12 additions & 5 deletions tst/xmodalg04.tst
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Expand Up @@ -56,8 +56,8 @@ gap> Size2d( XIAk4 );
[ 125, 625 ]

# doc/xmod.xml:196-207
gap> RepresentationsOfObject( XIAk4 );
[ "IsComponentObjectRep", "IsAttributeStoringRep", "IsPreXModAlgebraObj" ]
gap> Set( RepresentationsOfObject( XIAk4 ) );
[ "IsAttributeStoringRep", "IsComponentObjectRep", "IsPreXModAlgebraObj" ]
gap> Set( KnownPropertiesOfObject( XIAk4 ) );
[ "CanEasilyCompareElements", "CanEasilySortElements", "Is2dAlgebraObject",
"IsAdditivelyCommutative", "IsDuplicateFree", "IsLDistributive",
Expand Down Expand Up @@ -140,7 +140,14 @@ Crossed module [<e4> -> ..] :-
: Boundary homomorphism maps source generators to:
[ (Z(5)^0)*<identity> of ...+(Z(5)^0)*f1+(Z(5)^2)*f2+(Z(5)^2)*f1*f2 ]

# doc/xmod.xml:377-420
# doc/../lib/dsum-xmod.gd:186-192

gap> ## the following command is failing at present:
gap> ## XY3 := DirectSumOfXModAlgebras( X3, Y3 );
gap> ## [ GR(c3)(+)A(M3) -> A3(+)A3 ]


# doc/xmod.xml:379-422
gap> c4 := CyclicGroup( 4 );;
gap> Ac4 := GroupRing( GF(2), c4 );
<algebra-with-one over GF(2), with 2 generators>
Expand Down Expand Up @@ -184,7 +191,7 @@ true
gap> IsSingleValued( mor );
true

# doc/xmod.xml:441-450
# doc/xmod.xml:443-452
gap> Xmor := Kernel( mor );
[ <algebra of dimension 2 over GF(2)> -> <algebra of dimension 2 over GF(2)> ]
gap> IsXModAlgebra( Xmor );
Expand All @@ -194,7 +201,7 @@ gap> Size2d( Xmor );
gap> IsSubXModAlgebra( XIAc4, Xmor );
true

# doc/xmod.xml:501-526
# doc/xmod.xml:503-528
gap> ic4 := One( Ac4 );;
gap> e1 := ic4*c4.1 + ic4*c4.2;
(Z(2)^0)*f1+(Z(2)^0)*f2
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