Given use the Fitch system to prove q(a) I have started: but I do not know how to continue. I believe I must prove also and by existential elimination I will get q(a). Can you help me solve it?
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This is much simpler. Instantiate x with a in ∀x (p(x) => q(x)) and then use Modus Ponens (implication elimination) with p(a).
Thanks!
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