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Theorem 19.3v 1665
Description: Special case of Theorem 19.3 of [Margaris] p. 89. (Contributed by NM, 1-Aug-2017.) (Revised by Wolf Lammen to remove dependency on ax-8, 4-Dec-2017.)
Assertion
Ref Expression
19.3v
Distinct variable group:   ,

Proof of Theorem 19.3v
StepHypRef Expression
1 alex 1572 . 2
2 19.9v 1664 . . 3
32con2bii 322 . 2
41, 3bitr4i 243 1
Colors of variables: wff setvar class
Syntax hints:   wn 3   wb 176  wal 1540  wex 1541
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654
This theorem depends on definitions:  df-bi 177  df-an 360  df-ex 1542
This theorem is referenced by:  spvw  1666  19.9vOLD  1697
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