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D.15.21.14 strand

Procedure from library tateProdCplxNegGrad.lib (see tateProdCplxNegGrad_lib).

Usage:
strand(T,c,J)

Purpose:
compute the strand of T w.r.t. the set J and the vector c

Return:
subquotient complex of T which is the strand of T

Example:
 
LIB "tateProdCplxNegGrad.lib";
intvec f = 1,1;
def (S,E) = productOfProjectiveSpaces(f);
intvec low = -3,-3;
intvec high = 3,3;
setring(S);
module M = 0;
intmat MGrading[2][1] = -1,-1;
M = setModuleGrading(M,MGrading);
multigradedcomplex tate;
(E,tate) = tateResolution(M,low,high);
setring(E);
ring Z = cohomologyMatrixFromResolution(tate,low,high);
setring(Z);
print(cohomologymat);
setring(E);
intvec  c= 0,-3;
intvec J = 1;
multigradedcomplex U = strand(tate,c,J);
U;
Z = cohomologyMatrixFromResolution(U,low,high);
setring(Z);
print(cohomologymat);


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