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Mirrors > Home > ILE Home > Th. List > Mathboxes > bj-nndcALT | Unicode version |
Description: Alternate proof of nndc 851. (Proof modification is discouraged.) (New usage is discouraged.) (Contributed by BJ, 9-Oct-2019.) |
Ref | Expression |
---|---|
bj-nndcALT |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | notnot 629 |
. . 3
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2 | bj-nnor 14422 |
. . 3
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3 | 1, 2 | mpbir 146 |
. 2
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4 | df-dc 835 |
. . 3
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5 | 4 | notbii 668 |
. 2
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6 | 3, 5 | mtbir 671 |
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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