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2.1.15 Let R be the proposition “The summit of Mount Everest is underwater”. Suppose that S...

2.1.15 Let R be the proposition “The summit of Mount Everest is underwater”. Suppose that S is a proposition such that(R∨S) ⇐⇒ (R∧S) is false.

(a) What can you say about S?

(b) What if, instead, (R ∨ S) ⇐⇒ (R ∧ S) is true? Hopefully it is obvious to you that R is false. . .

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