For each of the following arguments, adding just two statements to the premises will produce a formal proof of its validity. Construct a formal proof for each of these arguments.
1. W ⊃ X
2. Y ⊃ X
Therefore, W ⊃ Y
9.9 exercise 2
Prove the invalidity of the following by the method of assigning truth values.
Not (E and F)
(not-E and not-F) implies (G and H)
9.10 A Exercise 2
For the following, either construct a formal proof of validity or prove invalidity by the method of assigning truth values to the simple statements involved.
Therefore, (E or G) implies (F and H)
9.11, argument 3 —- in page 394.
For each of the following arguments, construct an indirect proof of validity.
1. (D v E) ⊃ (F ⊃ G)
2. ( G v H) ⊃ (D · F)
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