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Theorem pm13.18 2768
Description: Theorem *13.18 in [WhiteheadRussell] p. 178. (Contributed by Andrew Salmon, 3-Jun-2011.)
Assertion
Ref Expression
pm13.18

Proof of Theorem pm13.18
StepHypRef Expression
1 eqeq1 2461 . . . 4
21biimprd 223 . . 3
32necon3d 2681 . 2
43imp 429 1
Colors of variables: wff setvar class
Syntax hints:  ->wi 4  /\wa 369  =wceq 1395  =/=wne 2652
This theorem is referenced by:  pm13.181  2769  cncfiooicclem1  31696  4atexlemex4  35797
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-ext 2435
This theorem depends on definitions:  df-bi 185  df-an 371  df-cleq 2449  df-ne 2654
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