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Theorem imp4b 573
Description: An importation inference. (Contributed by NM, 26-Apr-1994.)
Hypothesis
Ref Expression
imp4.1
Assertion
Ref Expression
imp4b

Proof of Theorem imp4b
StepHypRef Expression
1 imp4.1 . . 3
21imp4a 572 . 2
32imp 418 1
Colors of variables: wff setvar class
Syntax hints:   wi 4   wa 358
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 177  df-an 360
This theorem is referenced by:  imp43  578
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