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Theorem necon4aiOLD 2696
Description: Obsolete proof of necon4ai 2695 as of 22-Nov-2019. (Contributed by NM, 16-Jan-2007.) (Proof shortened by Andrew Salmon, 25-May-2011.) (Proof modification is discouraged.) (New usage is discouraged.)
Hypothesis
Ref Expression
necon4ai.1
Assertion
Ref Expression
necon4aiOLD

Proof of Theorem necon4aiOLD
StepHypRef Expression
1 necon4ai.1 . . 3
21con2i 120 . 2
3 nne 2658 . 2
42, 3sylib 196 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3  ->wi 4  =wceq 1395  =/=wne 2652
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem depends on definitions:  df-bi 185  df-ne 2654
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