Clause Form

(all x) (Macintosh(x) -> UsesElectricity(x)

UsesElectricity(x) v Not Macintosh(x).

Any boolean formula can be put into conjunctive normal form (CNF).

If not Y then X and not Z.

Y or (X & not Z)

(Y or X & (Y or not Z)

(X v Y) & (Y v ~Z)

clauses: (X v Y), (Y v ~Z)

X, Y, and ~Z are called literals.

Each clause is a disjunction of literals.

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