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Mirrors > Home > ILE Home > Th. List > necon1abiddc | Unicode version |
Description: Contrapositive deduction for inequality. (Contributed by Jim Kingdon, 16-May-2018.) |
Ref | Expression |
---|---|
necon1abiddc.1 |
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Ref | Expression |
---|---|
necon1abiddc |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | necon1abiddc.1 |
. . 3
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2 | 1 | con1biddc 876 |
. 2
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3 | df-ne 2348 |
. . 3
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4 | 3 | bibi1i 228 |
. 2
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5 | 2, 4 | syl6ibr 162 |
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-stab 831 df-dc 835 df-ne 2348 |
This theorem is referenced by: necon2abiddc 2413 |
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