Decide whether each of the following wffs is valid or invalid. Justify your answer. a. Ex)A(x) → ((Vx)[A(x)]')' b. (Vx)P(x) V (3x)Q(x)→ (Vx)[P(x) V Q)]

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter3: Functions And Graphs
Section3.5: Graphs Of Functions
Problem 56E
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Decide whether each of the following wffs is valid or invalid. Justify your answer.
a. Ex)A(x) → ((Vx)[A(x)]')'
b. (Vx)P(x) V (3x)Q(x)→ (Vx)[P(x) V Q)]
Transcribed Image Text:Decide whether each of the following wffs is valid or invalid. Justify your answer. a. Ex)A(x) → ((Vx)[A(x)]')' b. (Vx)P(x) V (3x)Q(x)→ (Vx)[P(x) V Q)]
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