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Theorem norasslem2 1536
Description: This lemma specializes biimt 364 suitably for the proof of norass 1538. (Contributed by Wolf Lammen, 18-Dec-2023.)
Assertion
Ref Expression
norasslem2 (𝜑 → (𝜓 ↔ ((𝜑𝜒) → 𝜓)))

Proof of Theorem norasslem2
StepHypRef Expression
1 orc 866 . 2 (𝜑 → (𝜑𝜒))
2 biimt 364 . 2 ((𝜑𝜒) → (𝜓 ↔ ((𝜑𝜒) → 𝜓)))
31, 2syl 17 1 (𝜑 → (𝜓 ↔ ((𝜑𝜒) → 𝜓)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 209  wo 846
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-or 847
This theorem is referenced by:  norass  1538
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