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Theorem pm5.71dc 867
Description: Decidable proposition version of theorem *5.71 of [WhiteheadRussell] p. 125. (Contributed by Roy F. Longton, 23-Jun-2005.) (Modified for decidability by Jim Kingdon, 19-Apr-2018.)
Assertion
Ref Expression
pm5.71dc DECID

Proof of Theorem pm5.71dc
StepHypRef Expression
1 orel2 644 . . . . 5
2 orc 632 . . . . 5
31, 2impbid1 130 . . . 4
43anbi1d 438 . . 3
54a1i 9 . 2 DECID
6 pm2.21 547 . . 3
76pm5.32rd 424 . 2
85, 7jadc 759 1 DECID
Colors of variables: wff set class
Syntax hints:   wn 3   wi 4   wa 97   wb 98   wo 628  DECID wdc 741
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-in2 545  ax-io 629
This theorem depends on definitions:  df-bi 110  df-dc 742
This theorem is referenced by: (None)
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