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What is a valid formula of first-order logic? Any examples? - What is a satisfiable formula of first-order logic. Any examples? - What is an

What is a valid formula of first-order logic? Any examples? - What is a satisfiable formula of first-order logic. Any examples? - What is an unsatisfiable formula of first-order logic. Any examples? - How do we define an interpretation of a set of FOL formulas? Any examples? - Let A be a first-order logic formula. What is a free variable of A? What is a bound variable of A? Any examples?

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