| #### D.15.7.6 grzero Procedure from library `gradedModules.lib` (see gradedModules_lib). Usage: grzero() Return: graded object representing S(0)^1 Purpose: compute presentation of S(0)^1 Example:
    LIB "gradedModules.lib";
    ring r=32003,(x,y,z),dp;
    grview( grobj(freemodule(0), intvec(0:0), intvec(0:0)) );
    ==> Graded homomorphism: 0 <- 0, given by zero (0^2) matrix.
    grview( grobj(freemodule(0), intvec(0:0)) );
    ==> Graded homomorphism: 0 <- 0, given by zero (0^2) matrix.
    grview( grzero() );
    ==> Graded homomorphism: 0 <- 0, given by zero (0^2) matrix.
    //  def M = grpower( grshift( grzero(), 3), 2 ); grview(M);

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