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Mirrors > Home > ILE Home > Th. List > notbi | Unicode version |
Description: Equivalence property for negation. Closed form. (Contributed by BJ, 27-Jan-2020.) |
Ref | Expression |
---|---|
notbi |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | bi2 129 |
. . 3
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2 | 1 | con3d 621 |
. 2
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3 | bi1 117 |
. . 3
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4 | 3 | con3d 621 |
. 2
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5 | 2, 4 | impbid 128 |
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 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 |
This theorem depends on definitions: df-bi 116 |
This theorem is referenced by: notbid 657 notbii 658 ifbi 3497 |
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