| #### D.15.28.7 Sfunction Procedure from library `tropicalEllipticCovers.lib` (see tropicalEllipticCovers_lib). Usage: Sfunction(z,k); z poly, k int Assume: z is a polynomial and k is an integer Return: poly Theory: Returns the S-function in the form of (1+X), where X is a taylor series expansion of the sinh function upto k terms. Example:
    LIB "tropicalEllipticCovers.lib";
    ring R=0,(x,y),dp;
    Sfunction(x,3);

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