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Theorem pm5.24dc 1286
Description: Theorem *5.24 of [WhiteheadRussell] p. 124, but for decidable propositions. (Contributed by Jim Kingdon, 5-May-2018.)
Assertion
Ref Expression
pm5.24dc DECID DECID

Proof of Theorem pm5.24dc
StepHypRef Expression
1 dfbi3dc 1285 . . . . 5 DECID DECID
21imp 115 . . . 4 DECID DECID
32notbid 591 . . 3 DECID DECID
4 xordc 1280 . . . 4 DECID DECID
54imp 115 . . 3 DECID DECID
63, 5bitr3d 179 . 2 DECID DECID
76ex 108 1 DECID 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-in1 544  ax-in2 545  ax-io 629
This theorem depends on definitions:  df-bi 110  df-dc 742  df-xor 1266
This theorem is referenced by: (None)
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