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1. (a) Prove part (2) of the Lemma on page 3 of the Week 8 Slides. That is, show that if and are formulas

1. (a) Prove part (2) of the Lemma on page 3 of the Week 8 Slides. That is, show that if and are formulas of a first order language C and I = (A,B) is an interpretation of C, then I (V) iff I por I.

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