Clause Form
Expressions such as P, ~P, Q and ~Q are called literals.
They are atomic formulas to which a negation may be prefixed.
A clause is an expression of the form L1 v L2 v ... v Lq
where each Li is a literal.
Any propositional calculus formula can be represented as a set of clauses.
~(P & (Q -> R)) starting formula
~(P & (~Q v R)) eliminate ->
~((P & ~Q) v (P & R)) distribute & over v.
~(P & ~Q) & ~(P & R) DeMorgan’s law
(~P v ~~Q) & (~P v ~R) “ “
~P v Q, ~P v ~R Double neg. and break into clauses