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Existential Introduction

  • If P(c) is true, then ∃x P(x) is inferred.

  • The inverse of existential elimination

  • All instances of the given constant symbol are replaced by the new variable symbol

  • Note that the variable symbol cannot already exist anywhere in the expression

  • Example:

    • Eats(Ziggy, IceCream)

    • ∃x Eats(Ziggy,x)


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