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Theorem 19.45 1970
Description: Theorem 19.45 of [Margaris] p. 90. (Contributed by NM, 12-Mar-1993.)
Hypothesis
Ref Expression
19.45.1
Assertion
Ref Expression
19.45

Proof of Theorem 19.45
StepHypRef Expression
1 19.43 1693 . 2
2 19.45.1 . . . 4
3219.9 1893 . . 3
43orbi1i 520 . 2
51, 4bitri 249 1
Colors of variables: wff setvar class
Syntax hints:  <->wb 184  \/wo 368  E.wex 1612  F/wnf 1616
This theorem is referenced by:  eeor  1976
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-or 370  df-ex 1613  df-nf 1617
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