ILE Home Intuitionistic Logic Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >  3anibar GIF version

Theorem 3anibar 1111
Description: Remove a hypothesis from the second member of a biimplication. (Contributed by FL, 22-Jul-2008.)
Hypothesis
Ref Expression
3anibar.1 ((𝜑𝜓𝜒) → (𝜃 ↔ (𝜒𝜏)))
Assertion
Ref Expression
3anibar ((𝜑𝜓𝜒) → (𝜃𝜏))

Proof of Theorem 3anibar
StepHypRef Expression
1 3anibar.1 . 2 ((𝜑𝜓𝜒) → (𝜃 ↔ (𝜒𝜏)))
2 simp3 945 . . 3 ((𝜑𝜓𝜒) → 𝜒)
32biantrurd 299 . 2 ((𝜑𝜓𝜒) → (𝜏 ↔ (𝜒𝜏)))
41, 3bitr4d 189 1 ((𝜑𝜓𝜒) → (𝜃𝜏))
Colors of variables: wff set class
Syntax hints:  wi 4  wa 102  wb 103  w3a 924
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106
This theorem depends on definitions:  df-bi 115  df-3an 926
This theorem is referenced by:  frecsuclem  6171  shftfibg  10250
  Copyright terms: Public domain W3C validator