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D.4.7.17 kontrahom

Procedure from library homolog.lib (see homolog_lib).

Usage:
kontrahom(A,k); A=matrix, k=integer

Return:
matrix Hom(A,R^k), i.e. let A be a matrix defining a map F1-->F2 of free R-modules, then the matrix of Hom(F2,R^k)-->Hom(F1,R^k) is computed (R=basering).

Example:
 


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