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an abelian group and we consider the group homomorphisms from A into A. Then addition of two such homomorphisms may be defined pointwise to produce another group homomorphism. Explicitly, given two such homomorphisms f and g, the sum of f and g is the homomorphism ''f'' + ''g'' : ''x'' ? ''f''(''x'') + ''g''(''x''). Under this operation End(A) is an abelian group. With the additional operation of composition of homomorphisms, End(A) is a ring with multiplicative identity. This composition is explicitly ''fg'' : ''x'' ? ''f''(''g''(''x'')). The

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