GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
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## Matrices.gd SCO package Simon Goertzen
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## Copyright 2007-2008 Lehrstuhl B für Mathematik, RWTH Aachen
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## Declaration stuff for matrix creation.
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DeclareGlobalFunction( "BoundaryOperator" );
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DeclareOperation( "CreateCoboundaryMatrices",
[ IsSimplicialSet, IsInt, IsHomalgRing ] );
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DeclareOperation( "CreateCoboundaryMatrices",
[ IsSimplicialSet, IsHomalgRing ] );
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DeclareOperation( "CreateBoundaryMatrices",
[ IsSimplicialSet, IsInt, IsHomalgRing ] );
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DeclareOperation( "CreateBoundaryMatrices",
[ IsSimplicialSet, IsHomalgRing ] );