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Theorem ifpbi3 41814
Description: Equivalence theorem for conditional logical operators. (Contributed by RP, 14-Apr-2020.)
Assertion
Ref Expression
ifpbi3 ((𝜑𝜓) → (if-(𝜒, 𝜃, 𝜑) ↔ if-(𝜒, 𝜃, 𝜓)))

Proof of Theorem ifpbi3
StepHypRef Expression
1 imbi2 349 . . 3 ((𝜑𝜓) → ((¬ 𝜒𝜑) ↔ (¬ 𝜒𝜓)))
21anbi2d 630 . 2 ((𝜑𝜓) → (((𝜒𝜃) ∧ (¬ 𝜒𝜑)) ↔ ((𝜒𝜃) ∧ (¬ 𝜒𝜓))))
3 dfifp2 1064 . 2 (if-(𝜒, 𝜃, 𝜑) ↔ ((𝜒𝜃) ∧ (¬ 𝜒𝜑)))
4 dfifp2 1064 . 2 (if-(𝜒, 𝜃, 𝜓) ↔ ((𝜒𝜃) ∧ (¬ 𝜒𝜓)))
52, 3, 43bitr4g 314 1 ((𝜑𝜓) → (if-(𝜒, 𝜃, 𝜑) ↔ if-(𝜒, 𝜃, 𝜓)))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 205  wa 397  if-wif 1062
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 206  df-an 398  df-or 847  df-ifp 1063
This theorem is referenced by:  ifpxorcor  41822  ifpnot23c  41830  ifpdfnan  41832
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