Subspace( V, gens )
returns the subspace of the row space V that is generated by the vectors in the list gens.
gap> v:= GF(3)^2; v.name:= "v";; RowSpace( GF(3), [ [ Z(3)^0, 0*Z(3) ], [ 0*Z(3), Z(3)^0 ] ] ) gap> s:= Subspace( v, [ [ 1, -1 ] *Z(3)^0 ] ); Subspace( v, [ [ Z(3)^0, Z(3) ] ] )
GAP 3.4.4