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Mirrors > Home > ILE Home > Th. List > dcnnOLD | Unicode version |
Description: Obsolete proof of dcnnOLD 849 as of 25-Nov-2023. (Contributed by David A. Wheeler, 6-Dec-2018.) (Proof modification is discouraged.) (New usage is discouraged.) |
Ref | Expression |
---|---|
dcnnOLD |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | notnotnot 634 |
. . . 4
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2 | 1 | orbi2i 762 |
. . 3
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3 | orcom 728 |
. . 3
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4 | 2, 3 | bitri 184 |
. 2
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5 | df-dc 835 |
. 2
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6 | df-dc 835 |
. 2
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7 | 4, 5, 6 | 3bitr4ri 213 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 614 ax-in2 615 ax-io 709 |
This theorem depends on definitions: df-bi 117 df-dc 835 |
This theorem is referenced by: (None) |
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