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D.15.21.15 firstQuadrantComplex

Procedure from library tateProdCplxNegGrad.lib (see tateProdCplxNegGrad_lib).

Usage:
firstQuadrantComplex(T,c); T multigradedcomplex, c intvec

Purpose:
compute the first quadrant complex of T w.r.t. the set J and the vector c

Return:
subquotient complex of T which is the first quadrand complex of T