Theorem aisbbisfaisf 43129

Description: Given a is equivalent to b, b is equivalent to ⊥ there exists a proof for a is equivalent to F. (Contributed by Jarvin Udandy, 30-Aug-2016.)

Hypotheses

Ref	Expression
aisbbisfaisf.1	⊢ (𝜑 ↔ 𝜓)
aisbbisfaisf.2	⊢ (𝜓 ↔ ⊥)

Assertion

Ref	Expression
aisbbisfaisf	⊢ (𝜑 ↔ ⊥)

Proof of Theorem aisbbisfaisf

Step	Hyp	Ref	Expression
1		aisbbisfaisf.1	. 2 ⊢ (𝜑 ↔ 𝜓)
2		aisbbisfaisf.2	. 2 ⊢ (𝜓 ↔ ⊥)
3	1, 2	bitri 277	1 ⊢ (𝜑 ↔ ⊥)

Syntax hints:   ↔ wb 208  ⊥wfal 1543

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 209

This theorem is referenced by:  mdandysum2p2e4  43226