Prove valid 1. (x) (~Ax v Fx)                             / (x) (~Gx--> ~Ax) 2. (y) (~Fy v (~Cy v Gy)) 3. (v) (~(~Cv-->  ~Fv) --> ~Av)

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter1: Fundamental Concepts Of Algebra
Section1.3: Algebraic Expressions
Problem 20E
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2. Prove valid
1. (x) (~Ax v Fx)                             / (x) (~Gx--> ~Ax)
2. (y) (~Fy v (~Cy v Gy))
3. (v) (~(~Cv-->  ~Fv) --> ~Av)

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