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Theorem excomim 1742
Description: One direction of Theorem 19.11 of [Margaris] p. 89. (Contributed by NM, 5-Aug-1993.) (Revised by Mario Carneiro, 24-Sep-2016.) (Revised by Wolf Lammen to remove dependency on ax-11 1746 ax-6 1729 ax-9 1654 ax-8 1675 and ax-17 1616, 8-Jan-2018.)
Assertion
Ref Expression
excomim

Proof of Theorem excomim
StepHypRef Expression
1 excom 1741 . 2
21biimpi 186 1
Colors of variables: wff setvar class
Syntax hints:   wi 4  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-7 1734
This theorem depends on definitions:  df-bi 177  df-ex 1542
This theorem is referenced by:  excomOLD  1859  2euswap  2280
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