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Theorem euor2OLD 2322
Description: Obsolete proof of euor2 2321 as of 27-Dec-2018. (Contributed by NM, 21-Oct-2005.) (Proof shortened by Andrew Salmon, 9-Jul-2011.) (Proof modification is discouraged.) (New usage is discouraged.)
Assertion
Ref Expression
euor2OLD

Proof of Theorem euor2OLD
StepHypRef Expression
1 nfe1 1780 . . 3
21nfn 1840 . 2
3 19.8a 1797 . . . 4
43con3i 135 . . 3
5 orel1 382 . . . 4
6 olc 384 . . . 4
75, 6impbid1 203 . . 3
84, 7syl 16 . 2
92, 8eubid 2283 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3  ->wi 4  <->wb 184  \/wo 368  E.wex 1587  E!weu 2262
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1592  ax-4 1603  ax-5 1671  ax-6 1710  ax-7 1730  ax-10 1777  ax-12 1794
This theorem depends on definitions:  df-bi 185  df-or 370  df-ex 1588  df-nf 1591  df-eu 2266
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