Theorem bifal 1583

Description: A contradiction is equivalent to falsehood. (Contributed by Mario Carneiro, 9-May-2015.)

Hypothesis

Ref	Expression
bifal.1	⊢ ¬ 𝜑

Assertion

Ref	Expression
bifal	⊢ (𝜑 ↔ ⊥)

Proof of Theorem bifal

Step	Hyp	Ref	Expression
1		bifal.1	. 2 ⊢ ¬ 𝜑
2		fal 1581	. 2 ⊢ ¬ ⊥
3	1, 2	2false 378	1 ⊢ (𝜑 ↔ ⊥)

Syntax hints:  ¬ wn 3   ↔ wb 209  ⊥wfal 1579

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-tru 1570  df-fal 1580

This theorem is referenced by:  falantru  1602  dfnul4  4296  dfnul2  4297  abf  4377  ralnralall  4479  tgcgr4  28765  frgrregord013  30686  nrmo  36809  bj-ntrufal  37050  bicontr  38618  aibnbaif  47532  aifftbifffaibif  47546  atnaiana  47548