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Theorem exp4b 590
Description: An exportation inference. (Contributed by NM, 26-Apr-1994.) (Proof shortened by Wolf Lammen, 23-Nov-2012.)
Hypothesis
Ref Expression
exp4b.1
Assertion
Ref Expression
exp4b

Proof of Theorem exp4b
StepHypRef Expression
1 exp4b.1 . . 3
21ex 423 . 2
32exp4a 589 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:  exp43  595  reuss2  3535  nchoicelem17  6305
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