Theorem nanan 1449

Description: Write 'and' in terms of 'nand'. (Contributed by Mario Carneiro, 9-May-2015.)

Assertion

Ref	Expression
nanan	⊢ ((𝜑 ∧ 𝜓) ↔ ¬ (𝜑 ⊼ 𝜓))

Proof of Theorem nanan

Step	Hyp	Ref	Expression
1		df-nan 1448	. 2 ⊢ ((𝜑 ⊼ 𝜓) ↔ ¬ (𝜑 ∧ 𝜓))
2	1	con2bii 347	1 ⊢ ((𝜑 ∧ 𝜓) ↔ ¬ (𝜑 ⊼ 𝜓))

Syntax hints:  ¬ wn 3   ↔ wb 196   ∧ wa 384   ⊼ wnan 1447

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 197  df-nan 1448

This theorem is referenced by:  nannan  1451  wl-nannan  33298