show that p belongs to q or
Answers
Answer:
Show that (p ∧ q) → (p ∨ q) is a tautology
The first step shows: (p ∧ q) → (p ∨ q) ≡ ¬(p ∧ q) ∨ (p ∨ q)
I've been reading my text book and looking at Equivalence Laws. I know the answer to this but I don't understand the first step.
How is (p ∧ q)→ ≡ ¬(p ∧ q)?
If someone could explain this I would be extremely grateful. I'm sure its something simple and I am overlooking it.
The first thing I want to do when seeing this is
(p ∧ q) → (p ∨ q) ≡ ¬(p → ¬q)→(p ∨ q)
but the answer shows:
¬ (p ∧ q) ∨ (p ∨ q) (by logical equivalence)
Hope my answer will help you...
Step-by-step explanation:
x-> y = ~xvy
p^q -> pvq
= ~(p^q)v(pvq)
= ~pv~qvp vq
= (~pvp) v(~q vq)
= TvT = T
Always x v ~x results true
hence tautology,
hope my explanation is helpful to you - naimabanu055