MPE Home Metamath Proof Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >  necon1adOLD Unicode version

Theorem necon1adOLD 2674
Description: Obsolete proof of necon1ad 2673 as of 23-Nov-2019. (Contributed by NM, 2-Apr-2007.) (Proof modification is discouraged.) (New usage is discouraged.)
Hypothesis
Ref Expression
necon1ad.1
Assertion
Ref Expression
necon1adOLD

Proof of Theorem necon1adOLD
StepHypRef Expression
1 df-ne 2654 . 2
2 necon1ad.1 . . 3
32con1d 124 . 2
41, 3syl5bi 217 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
  Copyright terms: Public domain W3C validator