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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 |
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Ref | Expression |
---|---|
dcbid |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dcbid.1 |
. . 3
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2 | 1 | notbid 667 |
. . 3
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3 | 1, 2 | orbi12d 793 |
. 2
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4 | df-dc 835 |
. 2
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5 | df-dc 835 |
. 2
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6 | 3, 4, 5 | 3bitr4g 223 |
1
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