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Theorem 19.42vvv 1908
Description: Theorem 19.42 of [Margaris] p. 90 with 3 quantifiers. (Contributed by NM, 21-Sep-2011.)
Assertion
Ref Expression
19.42vvv
Distinct variable groups:   ,   ,   ,
Allowed substitution hints:   (,,)

Proof of Theorem 19.42vvv
StepHypRef Expression
1 19.42vv 1907 . . 3
21exbii 1582 . 2
3 19.42v 1905 . 2
42, 3bitri 240 1
Colors of variables: wff setvar class
Syntax hints:   wb 176   wa 358  wex 1541
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  ax-11 1746
This theorem depends on definitions:  df-bi 177  df-an 360  df-ex 1542  df-nf 1545
This theorem is referenced by:  ceqsex6v  2899
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