Exercise 58 … (For-Credit of 4 Points) (*) (1) Symbolize the following argument, (2) Establish its validity by a proof, and (3) “Evaluate” the argument as well. 1. All the beings that have wings can fly. 2. All birds have wings. C. Therefore, all birds can fly. NB: Evaluating an argument often calls for subjecting a critical premise to potential “counterexamples.” Exercise 60 … (For-Credit of 4 Points) (*) (1) Symbolize & (2) Prove the following argument: 1. All criminals are vicious. 2. Some humans are criminals. C. Thus some humans are vicious. —————————————————————————– 3. on alternative symbols for quantifiers As was in the Assignment , you may the following alternatives for the two quantifiers. 1. Universal Quantifier (x) … the same from the textbook but also you could use this: (Ax) .. for it as well to make it distinct from the other 2. Existential Quantifier (Ex)
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