| #### D.4.17.6 intersectMon Procedure from library `monomialideal.lib` (see monomialideal_lib). Usage: intersectMon (I,J); I,J ideals. Return: an ideal, the intersection of I and J. (it returns -1 if I or J are not monomial ideals) Assume: I,J are monomial ideals of the basering. Note: the minimal monomial generating set is returned. Example:
    LIB "monomialideal.lib";
    ring R = 0,(w,x,y,z,t),lp;
    ideal I = w^3*x*y,w*x*y*z*t,x^2*y^2*z^2,x^2*z^4*t^3,y^3*z;
    ideal J = w*x, x^2, y*z*t, y^5*t;
    intersectMon (I,J);
    ==> _[1]=y3zt
    ==> _[2]=wxyzt
    ==> _[3]=w3xy
    ==> _[4]=x2y2z2
    ==> _[5]=x2z4t3
    ==> _[6]=x2y3z
    ==> _[7]=wxy3z

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