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GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it

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LoadPackage( "LinearAlgebraForCAP" );

Q := HomalgFieldOfRationals( );

V := VectorSpaceObject( 1, Q );

W := VectorSpaceObject( 2, Q );

alpha := VectorSpaceMorphism( V, HomalgMatrix( [ [ 1, 0 ] ], Q ), W );

vecspaces := CapCategory( V );