Metamath Proof Explorer < Previous   Next > Nearby theorems Mirrors  >  Home  >  MPE Home  >  Th. List  >  19.43OLD Unicode version

Theorem 19.43OLD 1596
 Description: Obsolete proof of 19.43 1595 as of 3-May-2016. Leave this in for the example on the mmrecent.html page. (Contributed by NM, 5-Aug-1993.) (Proof modification is discouraged.) (New usage is discouraged.)
Assertion
Ref Expression
19.43OLD

Proof of Theorem 19.43OLD
StepHypRef Expression
1 ioran 476 . . . . 5
21albii 1556 . . . 4
3 19.26 1583 . . . 4
4 alnex 1533 . . . . 5
5 alnex 1533 . . . . 5
64, 5anbi12i 678 . . . 4
72, 3, 63bitri 262 . . 3
87notbii 287 . 2
9 df-ex 1532 . 2
10 oran 482 . 2
118, 9, 103bitr4i 268 1
 Colors of variables: wff set class Syntax hints:   wn 3   wb 176   wo 357   wa 358  wal 1530  wex 1531 This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1536  ax-5 1547 This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-ex 1532
 Copyright terms: Public domain W3C validator