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Mirrors > Home > ILE Home > Th. List > annimdc | Unicode version |
Description: Express conjunction in terms of implication. The forward direction, annimim 782, is valid for all propositions, but as an equivalence, it requires a decidability condition. (Contributed by Jim Kingdon, 25-Apr-2018.) |
Ref | Expression |
---|---|
annimdc | DECID DECID |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | imandc 786 | . . . 4 DECID | |
2 | 1 | adantl 262 | . . 3 DECID DECID |
3 | dcim 784 | . . . . 5 DECID DECID DECID | |
4 | 3 | imp 115 | . . . 4 DECID DECID DECID |
5 | dcn 746 | . . . . . 6 DECID DECID | |
6 | dcan 842 | . . . . . 6 DECID DECID DECID | |
7 | 5, 6 | syl5 28 | . . . . 5 DECID DECID DECID |
8 | 7 | imp 115 | . . . 4 DECID DECID DECID |
9 | con2bidc 769 | . . . 4 DECID DECID | |
10 | 4, 8, 9 | sylc 56 | . . 3 DECID DECID |
11 | 2, 10 | mpbid 135 | . 2 DECID DECID |
12 | 11 | ex 108 | 1 DECID DECID |
Colors of variables: wff set class |
Syntax hints: wn 3 wi 4 wa 97 wb 98 DECID wdc 742 |
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 630 |
This theorem depends on definitions: df-bi 110 df-dc 743 |
This theorem is referenced by: xordidc 1290 |
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