Question: - What is a semantic tableau and what is an advantage of using it to determine if a formula is satisfiable? - Theorem 2.60 in

- What is a semantic tableau and what is an advantage of using it to determine if a formula is satisfiable?

- Theorem 2.60 in our textbook states: A set of literals is satisfiable if and only if it does not contain a complementary pair of literals. Discuss and illustrate with examples the meaning of this theorem. (note: a literal is a propositional variable or a negation of a propositional variable)

- Discuss the algorithm for the construction of a semantic tableau for a formula in propositional logic. What is the main idea of the algorithm?

- Show and discuss examples of the use of semantic tableaux.

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