Singular Manual: cohomologyMatrixFromResolution

| #### D.15.24.8 cohomologyMatrixFromResolution Procedure from library `tateProdCplxNegGrad.lib` (see tateProdCplxNegGrad_lib). Usage: cohomologyMatrixFromResolution(T,low,high); T multigradedcomplex, low intvec, high intvec Purpose: computes the cohomology matrix corresponding to the multigraded complex T (part of a Tate resolution) Assume: T is a multigraded complex representing a part of a Tate resolution (for example output of tateResolution), basering is E Return: ring Z in which cohomology matrix lives, it is exported in the variable cohomologymat, cohomologymat stores information in the range between low and high Example:
    LIB "tateProdCplxNegGrad.lib";
    intvec c = 1,1;
    def (S,E) = productOfProjectiveSpaces(c);
    intvec low = -3,-3;
    intvec high = 3,3;
    setring(S);
    module M = 0;
    intmat grading[2][1] = -1,-1;
    M = setModuleGrading(M,grading);
    multigradedcomplex tate;
    (E,tate) = tateResolution(M,low,high);
    setring(E);
    ring Z = cohomologyMatrixFromResolution(tate,low,high);
    setring(Z);
    print(cohomologymat);

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