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8/16/2019 Leis e Regras
1/2
A ≡ A ∧ AA ≡ A ∨ A
A ∧ B ≡ B ∧ AA ∨ B ≡ B ∨ A
A ∧ (B ∧ C ) ≡ (A ∧ B) ∧ C
A ∨ (B ∨ C ) ≡ (A ∨ B) ∨ C
A ∧ (B ∨ C ) ≡ (A ∧ B) ∨ (A ∧ C )A ∨ (B ∧ C ) ≡ (A ∨ B) ∧ (A ∨ C )
¬¬A ≡ A
¬(A ∧ B) ≡ ¬A ∨ ¬B¬(A ∨ B) ≡ ¬A ∧ ¬B
A → B ≡ ¬A ∨ B
A ↔ B ≡ (A → B) ∧ (B → A)
A ↔ B ≡ (A ∧ B) ∨ (¬A ∧ ¬B)
A ↔ B ≡ (¬A ∨ B) ∧ (¬B ∨ A)
A → B ≡ ¬B → ¬A
(A ∧ B) → C ≡ A → (B → C )
A ∨ ¬A ≡ V
A ∧ V ≡ A
8/16/2019 Leis e Regras
2/2
A ∧ ¬A ≡ F
A ∨ F ≡ A
A, B ≡ A ∧ B
A |= A ∨ B
A ∧ B |= AA ∧ B |= B
(A ∨ B) ∧ (A ∨ ¬B) |= A
A → B |= A → (A ∧ B)
(A → B), A |= B
(A → B), ¬B |= ¬A
(A ∨ B), ¬A |= B(A ∨ B), ¬B |= A
(A → B), (B → C ) |= (A → C )
(A → B), (C → D), (A ∨ C ) |= (B ∨ D)
(A → B), (C → D), (¬B ∨ ¬D) |= (¬A ∨ ¬C )
¬∀xP (x) ≡ ∃x¬P (x)¬∃xP (x) ≡ ∀x¬P (x)
∀x(P (x) ∧ Q(x)) ≡ ∀xP (x) ∧ ∀xQ(x)
∃x(P (x) ∨ Q(x)) ≡ ∃xP (x) ∨ ∃xQ(x)
∀
∀xP (x) |= P (x/t)
∀
P (t) |= ∀xP (x)
t
∃ P (t) |= ∃xP (x)
∃
∃xP (x) |= P (x/t)