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Problem 5: Let P(m, n) be “n is greater than or equal to m” where the...

Problem 5: Let P(m, n) be “n is greater than or equal to m” where the domain (universe of discourse) is the set of nonnegative integers. What are the truth values of ∃n ∀m P(m, n) and ∀m ∃n P(m, n)?

Problem 6: A stamp collector wants to include in her collection exactly one stamp from each country of Africa. If I(s) means that she has stamp s in her collection, F(s, c) means that stamp s was issued by country c, the domain for s is all stamps, and the domain for c is all countries of Africa, express the statement that her collection satisfies her requirement. Do not use the ∃! symbol.

Problem 7: Translate the following statement into propositional logic. Clearly specify used propositions: “Some person in the Games of Throne (name of a TV series) has visited Winterfell (city name) but has not visited King's Landing (city name).”

Problem 8: Show that the following conditional statements is a tautology without using truth tables and by using equivalence and inference rules.

[(p ∨ q) ∧ (p → r) ∧ (q → r)] → r

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