| #### D.15.13.34 isPositive Procedure from library `multigrading.lib` (see multigrading_lib). Usage: isPositive() Purpose: Computes whether the multigrading of the ring is positive. For computation theorem 8.6 of the Miller/Sturmfels book is used. Returns: true if the multigrading is positive Example:
    LIB "multigrading.lib";
    printlevel = 3;
    ring r = 0,(x,y),dp;
    intmat A[1][2]=-1,1;
    setBaseMultigrading(A);
    isPositive();
    ==> 0
    intmat B[1][2]=1,1;
    setBaseMultigrading(B);
    isPositive(B);
    ==> 1

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