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Theorem a2andOLD 812
Description: Obsolete proof of a2and 811 as of 19-Jan-2020. (Contributed by AV, 25-Oct-2019.) (Proof modification is discouraged.) (New usage is discouraged.)
Hypotheses
Ref Expression
a2and.1
a2and.2
Assertion
Ref Expression
a2andOLD

Proof of Theorem a2andOLD
StepHypRef Expression
1 a2and.2 . 2
2 a2and.1 . 2
3 pm2.27 39 . . . 4
4 pm2.27 39 . . . . . 6
5 pm2.27 39 . . . . . . . . 9
65adantlr 714 . . . . . . . 8
7 pm2.27 39 . . . . . . . 8
86, 7syl6 33 . . . . . . 7
98ex 434 . . . . . 6
104, 9syld 44 . . . . 5
1110com24 87 . . . 4
123, 11syld 44 . . 3
1312com14 88 . 2
141, 2, 13sylc 60 1
Colors of variables: wff setvar class
Syntax hints:  ->wi 4  /\wa 369
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-an 371
  Copyright terms: Public domain W3C validator