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Mirrors > Home > ILE Home > Th. List > dcbid | Unicode version |
Description: Equivalence property for decidability. Deduction form. (Contributed by Jim Kingdon, 7-Sep-2019.) |
Ref | Expression |
---|---|
dcbid.1 |
Ref | Expression |
---|---|
dcbid | DECID DECID |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dcbid.1 | . . 3 | |
2 | 1 | notbid 662 | . . 3 |
3 | 1, 2 | orbi12d 788 | . 2 |
4 | df-dc 830 | . 2 DECID | |
5 | df-dc 830 | . 2 DECID | |
6 | 3, 4, 5 | 3bitr4g 222 | 1 DECID DECID |
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