Theorem abciffcbatnabciffncba 46875

Description: Operands in a biconditional expression converted negated. Additionally biconditional converted to show antecedent implies sequent. Closed form. (Contributed by Jarvin Udandy, 7-Sep-2020.)

Assertion

Ref	Expression
abciffcbatnabciffncba	⊢ (¬ ((𝜑 ∧ 𝜓) ∧ 𝜒) → ¬ ((𝜒 ∧ 𝜓) ∧ 𝜑))

Proof of Theorem abciffcbatnabciffncba

Step	Hyp	Ref	Expression
1		an31 648	. . 3 ⊢ (((𝜑 ∧ 𝜓) ∧ 𝜒) ↔ ((𝜒 ∧ 𝜓) ∧ 𝜑))
2		notbi 319	. . . 4 ⊢ ((((𝜑 ∧ 𝜓) ∧ 𝜒) ↔ ((𝜒 ∧ 𝜓) ∧ 𝜑)) ↔ (¬ ((𝜑 ∧ 𝜓) ∧ 𝜒) ↔ ¬ ((𝜒 ∧ 𝜓) ∧ 𝜑)))
3	2	biimpi 216	. . 3 ⊢ ((((𝜑 ∧ 𝜓) ∧ 𝜒) ↔ ((𝜒 ∧ 𝜓) ∧ 𝜑)) → (¬ ((𝜑 ∧ 𝜓) ∧ 𝜒) ↔ ¬ ((𝜒 ∧ 𝜓) ∧ 𝜑)))
4	1, 3	ax-mp 5	. 2 ⊢ (¬ ((𝜑 ∧ 𝜓) ∧ 𝜒) ↔ ¬ ((𝜒 ∧ 𝜓) ∧ 𝜑))
5	4	biimpi 216	1 ⊢ (¬ ((𝜑 ∧ 𝜓) ∧ 𝜒) → ¬ ((𝜒 ∧ 𝜓) ∧ 𝜑))

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 206   ∧ wa 395

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8

This theorem depends on definitions:  df-bi 207  df-an 396

This theorem is referenced by: (None)