Laws of Propositional Logic

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14 Terms

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Identity

p ∧ T ≡ p; p ∨ F ≡ p

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Domination

p ∨ T ≡ T; p ∧ F ≡ F

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Idempotent

p ∧ p ≡ p; p ∨ p ≡ p

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Double Negation

¬¬p ≡ p

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Commutativity

p ∧ q ≡ q ∧ p; p ∨ q ≡ q ∨ p

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Associativity

(p ∧ q) ∧ r ≡ p ∧ (q ∧ r); (p ∨ q) ∨ r ≡ p ∨ (q ∨ r)

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Distributive Laws

p ∧ (q ∨ r) ≡ (p ∧ q) ∨ (p ∧ r); p ∨ (q ∧ r) ≡ (p ∨ q) ∧ (p ∨ r)

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DeMorgan's Laws

¬(p ∧ q) ≡ (¬p ∨ ¬q); ¬(p ∨ q) ≡ (¬p ∧ ¬q)

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Absorption

p ∨ (p ∧ q) ≡ p; p ∧ (p ∨ q) ≡ p

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Tautology

p ∨ ¬p ≡ T

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Contradiction

p ∧ ¬p ≡ F

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Contrapositive

p ⇒ q ≡ ¬q ⇒ ¬p

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Conditional Disjunction Equivalence

p ⇒ q ≡ ¬p ∨ q

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Biconditional

p ⇔ q ≡ (p ⇒ q) ∧ (q ⇒ p)

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