Question: 8.13. Clause-monotone satisfiability problem: A formula is monotone if each clause of it contains either only positive variables or only negative variables. For instance F=(X1X2)&(X3)&(X2X3)

8.13. Clause-monotone satisfiability problem: A formula is monotone if each clause of it contains either only positive variables or only negative variables. For instance F=(X1X2)&(X3)&(X2X3) is a monotone formula. Show that the problem of deciding whether a monotone formula is satisfiable or not is NP-complete

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