Question: Derive the following sequent three different ways: (1) Direct proof, (2) Conditional proof, (3) Indirect proof. In our system, conditional proof involves the hypothetical rule

Derive the following sequent three different ways: (1) Direct proof, (2) Conditional proof, (3) Indirect proof. In our system, conditional proof involves the hypothetical rule called Conditional Introduction (I) and indirect proof involves the hypothetical rule called Negation Introduction (~I).

(P v Q), P (R S), Q (R S) R S

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