| #### D.5.17.11 rankSheaf Procedure from library `schubert.lib` (see schubert_lib). Usage: rankSheaf(S); S sheaf Return: int Input: S is a sheaf Output: a positive integer which is the rank of a sheaf. Example:
    LIB "schubert.lib";
    variety G = Grassmannian(2,4);
    def R = G.baseRing;
    setring R;
    sheaf S = makeSheaf(G,subBundle);
    rankSheaf(S);
    ==> 2
See also: makeSheaf; printSheaf.

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