Logic Strand Lecture 3
Logic Strand Lecture 3
Logic Strand Lecture 3
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6. Implication Laws:<br />
• ( P ⇒ Q)<br />
≡<br />
• ( P<br />
⇔ Q)<br />
≡<br />
7. Identity Laws:<br />
• ( P ∨<br />
F ) ≡<br />
• ( P ∧ T ) ≡<br />
P<br />
( ~ P ∨ Q)<br />
(Implication)<br />
((<br />
P ⇒ Q)<br />
∧ ( Q ⇒ P)<br />
) (Biconditional)<br />
P<br />
8. Negation (Complement) Laws:<br />
• ( P∨<br />
• ( P∧<br />
~ P)<br />
≡ T<br />
~ P)<br />
≡<br />
F<br />
9. Dominance Laws:<br />
• ( P ∨ T )<br />
≡ T<br />
• ( P ∧ F ) ≡<br />
F<br />
10. Idempotent Laws:<br />
• ( P ∨<br />
P)<br />
≡<br />
• ( P ∧ P)<br />
≡<br />
P<br />
P<br />
11. Absorption Laws:<br />
• P ∧ ( P ∨ Q)<br />
≡ P<br />
• P ∨ ( P ∧ Q)<br />
≡ P<br />
12. Property of Implication:<br />
• ( P ⇒ ( Q ∧ R)<br />
) ≡ ((<br />
P ⇒ Q)<br />
∧ ( P ⇒ R)<br />
)<br />
• ((<br />
P ∨ Q)<br />
⇒ R) ≡ ((<br />
P ⇒ R)<br />
∧ ( Q ⇒ R)<br />
)<br />
WUCT121 <strong>Logic</strong> 56