73.109 XModEndomorphismDerivation

XModEndomorphismDerivation( chi )

The endomorphisms sigma4, rho4 together determine a pair which may be used to construct an endomorphism of {cal X}. When the derivation is regular, the resulting morphism is an automorphism, and this construction determines a homomorphism from the Whitehead group to the automorphism group of X.

    gap> phi4 := XModEndomorphismDerivation( chi4 );
    Morphism of crossed modules <[c3->s3]->[c3->s3]>  

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