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    Philosophy
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    Introduction to Formal Logic with Philosophical Applications
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    Exam 5: Full First-Order Logic
  5. Question
    Construct a Derivation of Each Logical Truth of Identity Theory
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Construct a Derivation of Each Logical Truth of Identity Theory

Question 220

Question 220

Essay

construct a derivation of each logical truth of identity theory.
-(?x)[Px • (?y)(Qy • y=x)] ? (?x)(Px • Qx)

Correct Answer:

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\[\begin{array} { | l l }
\text { 1. } ...

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