Using only the Primitive Rules, prove the following double sequent:   (A v B) → A ⊣⊢ B → A

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter7: Real And Complex Numbers
Section7.1: The Field Of Real Numbers
Problem 20E: Give counterexamples for the following statements. If and are irrational, then is irrational. If ...
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Using only the Primitive Rules, prove the following double sequent:

 

(A v B) → A ⊣⊢ B → A 

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