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Mirrors > Home > ILE Home > Th. List > pm3.13dc | Unicode version |
Description: Theorem *3.13 of [WhiteheadRussell] p. 111, but for decidable propositions. The converse, pm3.14 702, holds for all propositions. (Contributed by Jim Kingdon, 22-Apr-2018.) |
Ref | Expression |
---|---|
pm3.13dc | DECID DECID |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dcn 779 | . . 3 DECID DECID | |
2 | dcn 779 | . . 3 DECID DECID | |
3 | dcor 876 | . . 3 DECID DECID DECID | |
4 | 1, 2, 3 | syl2im 38 | . 2 DECID DECID DECID |
5 | pm3.11dc 898 | . 2 DECID DECID | |
6 | con1dc 786 | . 2 DECID | |
7 | 4, 5, 6 | syl6c 65 | 1 DECID DECID |
Colors of variables: wff set class |
Syntax hints: wn 3 wi 4 wa 102 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-in1 576 ax-in2 577 ax-io 662 |
This theorem depends on definitions: df-bi 115 df-dc 776 |
This theorem is referenced by: (None) |
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