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#companion ps isomorphism
mat := [[1,0,0],[3,0,2],[0,5,4]]*Z(7^3);
frob := FrobeniusAutomorphism(GF(7^3));
delta := StandardDualityOfProjectiveSpace(ProjectiveSpace(2,GF(7^3)));
phi := CorrelationOfProjectiveSpace(mat,frob,GF(7^3),delta);
ProjectiveSpaceIsomorphism(phi);
quit;
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