Exercise 15. Use the method of conditional proof to explain in words why the sentence {(Pv Q)A [(P= R)A (Q= S)]}= (R V S) is a tautology.12 Be explicit about discharging assumptions.

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Exercise 15. Use the method of conditional proof to explain in words why the sentence
{(Pv Q) A [(P= R) A (Q = S)]} = (RV S)
is a tautology.2 Be explicit about discharging assumptions.
Transcribed Image Text:Exercise 15. Use the method of conditional proof to explain in words why the sentence {(Pv Q) A [(P= R) A (Q = S)]} = (RV S) is a tautology.2 Be explicit about discharging assumptions.
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