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D.15.21.3 truncateCoker

Procedure from library tateProdCplxNegGrad.lib (see tateProdCplxNegGrad_lib).

Usage:
truncateCoker(M,c); M module, c intvec

Purpose:
truncate cokernel coker(M) at the multidegree c

Return:
module, which is a presentation matrix of the truncation of coker(M) at c

Example:
 
LIB "tateProdCplxNegGrad.lib";
// example 1
intvec c1 = 1,1,1;
def(S1,E1) = productOfProjectiveSpaces(c1);
setring(S1);
module M1= 0;
intmat grading1[3][1] = 0,0,0;
M1 = setModuleGrading(M1,grading1);
truncateCoker(M1,c1);
// example 2
intvec c2 = 1,1;
def (S2,E2) = productOfProjectiveSpaces(c2);
setring(S2);
module M2 = 0;
intmat grading2[2][1] = 0,0;
M2 = setModuleGrading(M2,grading2);
truncateCoker(M2,c2);


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