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Theorem 19.42 1972
Description: Theorem 19.42 of [Margaris] p. 90. See 19.42v 1775 for a version requiring fewer axioms. (Contributed by NM, 18-Aug-1993.)
Hypothesis
Ref Expression
19.42.1
Assertion
Ref Expression
19.42

Proof of Theorem 19.42
StepHypRef Expression
1 19.42.1 . . 3
2119.41 1971 . 2
3 exancom 1671 . 2
4 ancom 450 . 2
52, 3, 43bitr4i 277 1
Colors of variables: wff setvar class
Syntax hints:  <->wb 184  /\wa 369  E.wex 1612  F/wnf 1616
This theorem is referenced by:  eean  1987  r2exfOLD  2979  bnj596  33803  bnj916  33991  bnj983  34009
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1618  ax-4 1631  ax-5 1704  ax-6 1747  ax-7 1790  ax-10 1837  ax-12 1854
This theorem depends on definitions:  df-bi 185  df-an 371  df-ex 1613  df-nf 1617
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