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Mirrors > Home > ILE Home > Th. List > pm2.1dc | Unicode version |
Description: Commuted law of the excluded middle for a decidable proposition. Based on theorem *2.1 of [WhiteheadRussell] p. 101. (Contributed by Jim Kingdon, 25-Mar-2018.) |
Ref | Expression |
---|---|
pm2.1dc | DECID |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-dc 776 | . . 3 DECID | |
2 | orcom 679 | . . 3 | |
3 | 1, 2 | bitri 182 | . 2 DECID |
4 | 3 | biimpi 118 | 1 DECID |
Colors of variables: wff set class |
Syntax hints: wn 3 wi 4 wo 661 DECID wdc 775 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-io 662 |
This theorem depends on definitions: df-bi 115 df-dc 776 |
This theorem is referenced by: pm2.6dc 792 rabrsndc 3460 |
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