Theorem xnor 1541

Description: Two ways to write XNOR (exclusive not-or). (Contributed by Mario Carneiro, 4-Sep-2016.)

Assertion

Ref	Expression
xnor	⊢ ((𝜑 ↔ 𝜓) ↔ ¬ (𝜑 ⊻ 𝜓))

Proof of Theorem xnor

Step	Hyp	Ref	Expression
1		df-xor 1540	. 2 ⊢ ((𝜑 ⊻ 𝜓) ↔ ¬ (𝜑 ↔ 𝜓))
2	1	con2bii 360	1 ⊢ ((𝜑 ↔ 𝜓) ↔ ¬ (𝜑 ⊻ 𝜓))

Syntax hints:  ¬ wn 3   ↔ wb 209   ⊻ wxo 1539

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 210  df-xor 1540

This theorem is referenced by:  xorass  1543  xorneg2  1549  hadbi  1626  had0  1632  wl-df-3xor  38062  wl-3xorbi  38067  tsxo1  38736  tsxo2  38737