Foundations of Computation, Second edition by Carol Critchlow, David Eck
By Carol Critchlow, David Eck
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7. 8. 9. q→p q p t→r t r p∧r (p ∧ r) → s s premise premise from 1 and premise premise from 4 and from 3 and premise from 7 and 2 (modus ponens) 5 (modus ponens) 6 8 (modus ponens) 42 CHAPTER 1. LOGIC AND PROOF Once a formal proof has been constructed, it is convincing. Unfortunately, it’s not necessarily easy to come up with the proof. ”). For this proof, I might have thought: I want to prove s. I know that p ∧ r implies s, so if I can prove p ∧ r, I’m OK. But to prove p ∧ r, it’ll be enough to prove p and r separately.
2. Each of the following is a valid rule of deduction. For each one, give an example of a valid argument in English that uses that rule. p∨q ¬p ∴ q p∧q ∴ p p q ∴ p∧q p ∴ p∨q 3. There are two notorious invalid arguments that look deceptively like modus ponens and modus tollens: p→q q ∴ p p→q ¬p ∴ ¬q Show that each of these arguments is invalid. Give an English example that uses each of these arguments. 4. Decide whether each of the following arguments is valid. If it is valid, give a formal proof.
The first part of this conjunction says that there is at least one happy person. The second part says that if y and z are both happy people, then they are actually the same person. ) To calculate in predicate logic, we need a notion of logical equivalence. Clearly, there are pairs of propositions in predicate logic that mean the same thing. ” These statements have the same truth value: If not everyone is happy, then someone is unhappy and vice versa. But logical equivalence is much stronger than just having the same truth value.