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Theorem nabi2 31560
Description: Constructor theorem for . (Contributed by Anthony Hart, 1-Sep-2011.)
Assertion
Ref Expression
nabi2 ((𝜑𝜓) → ((𝜒𝜑) ↔ (𝜒𝜓)))

Proof of Theorem nabi2
StepHypRef Expression
1 nanbi2 1448 1 ((𝜑𝜓) → ((𝜒𝜑) ↔ (𝜒𝜓)))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 195  wnan 1439
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 196  df-an 385  df-nan 1440
This theorem is referenced by: (None)
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