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  • FOL formulas are joined together by logical operators to form more complex formulas (just like in propositional logic)

  • The basic logical operators are the same as in propositional logic as well:

    • Negation: ¬p („it is not the case that p“)

    • Conjunction: p ∧ q („p and q“)

    • Disjunction: p ∨ q („p or q“)

    • Implication: p → q („p implies q“ or “q if p“)

    • Equivalence: p ↔ q („p if and only if q“)

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