Answer to Question #308449 in Discrete Mathematics for shouty

Question #308449

Show that (p ∧ q) → (p ∨ q) is a tautology. 


1
Expert's answer
2022-03-10T07:52:27-0500

Solution


A  tautology is a proposition that is always true.


To show the given proposition is a Tautology, the truth table of the proposition

(pq)(pq)(p ∧ q) → (p ∨ q) is shown below.





Furthermore,


(pq)(pq)¬(pq)(pq)(p ∧ q) → (p ∨ q) ≡ ¬(p ∧ q) ∨ (p ∨ q)


The last column shows that the proposition (pq)(pq)(p ∧ q) → (p ∨ q) is a Tautology.




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