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5 Let L= {f2,c} be a language including a binary function and a constant, and let TG be the set of sentences (Vx)(Vy) (Vz)(=

5 Let L= {f2,c} be a language including a binary function and a constant, and let TG be the set of sentences

5 Let L= {f2,c} be a language including a binary function and a constant, and let TG be the set of sentences (Vx)(Vy) (Vz)(= ffxyzfxfyz). (Vx)(= fxcx). (Vx)(= fcxx). (Vx) (y)(= fxyc A = fyxc). Prove that TG (Vr) (Vy)(= fayfyr). (Hint: Soundness.)

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