Theorem xorbin 1379

Description: A consequence of exclusive or. In classical logic the converse also holds. (Contributed by Jim Kingdon, 8-Mar-2018.)

Assertion

Ref	Expression
xorbin	⊢ ((𝜑 ⊻ 𝜓) → (𝜑 ↔ ¬ 𝜓))

Proof of Theorem xorbin

Step	Hyp	Ref	Expression
1		df-xor 1371	. . 3 ⊢ ((𝜑 ⊻ 𝜓) ↔ ((𝜑 ∨ 𝜓) ∧ ¬ (𝜑 ∧ 𝜓)))
2		imnan 685	. . . . 5 ⊢ ((𝜑 → ¬ 𝜓) ↔ ¬ (𝜑 ∧ 𝜓))
3	2	biimpri 132	. . . 4 ⊢ (¬ (𝜑 ∧ 𝜓) → (𝜑 → ¬ 𝜓))
4	3	adantl 275	. . 3 ⊢ (((𝜑 ∨ 𝜓) ∧ ¬ (𝜑 ∧ 𝜓)) → (𝜑 → ¬ 𝜓))
5	1, 4	sylbi 120	. 2 ⊢ ((𝜑 ⊻ 𝜓) → (𝜑 → ¬ 𝜓))
6		pm2.53 717	. . . . 5 ⊢ ((𝜓 ∨ 𝜑) → (¬ 𝜓 → 𝜑))
7	6	orcoms 725	. . . 4 ⊢ ((𝜑 ∨ 𝜓) → (¬ 𝜓 → 𝜑))
8	7	adantr 274	. . 3 ⊢ (((𝜑 ∨ 𝜓) ∧ ¬ (𝜑 ∧ 𝜓)) → (¬ 𝜓 → 𝜑))
9	1, 8	sylbi 120	. 2 ⊢ ((𝜑 ⊻ 𝜓) → (¬ 𝜓 → 𝜑))
10	5, 9	impbid 128	1 ⊢ ((𝜑 ⊻ 𝜓) → (𝜑 ↔ ¬ 𝜓))

Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 103   ↔ wb 104   ∨ wo 703   ⊻ wxo 1370

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 609  ax-in2 610  ax-io 704

This theorem depends on definitions:  df-bi 116  df-xor 1371

This theorem is referenced by:  xornbi  1381  zeo4  11829  odd2np1  11832