| #### D.13.7.3 newtonPolygonNegSlopes Procedure from library `tropicalNewton.lib` (see tropicalNewton_lib). Usage: newtonPolygonNegSlopes(g,b); g poly, b int Return: list, the negative slopes of the Newton Polygon of g if b==1, computes root (type poly) instead if (easily) possible Assume: uniformizingParameter is set and g univariate Example:
    LIB "tropicalNewton.lib";
    ring r = (0,t),x,dp;
    setUniformizingParameter(t);
    poly g = tx2+x+1;
    newtonPolygonNegSlopes(g);
    ==> [1]:
    ==> 0
    ==> [2]:
    ==> -1
    // poor man's polynomials over p-adic numbers:
    ring s = 0,x,dp;
    setUniformizingParameter(3);
    poly g = x2+9x+1;
    newtonPolygonNegSlopes(g);
    ==> [1]:
    ==> 0

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