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weakening (monotonicity) A rule of reasoning that implies that from a clause such as P⇒Q (where ⇒ should be interpreted as “implies” and P and Q are atoms) one can deduce both P∨R⇒Q and P⇒Q∨R (where ∨ signifies “or”). In other words, additional antecedents can always be added to a clause in a deduction.
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