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Mirrors > Home > MPE Home > Th. List > necon3bi | Structured version Visualization version Unicode version |
Description: Contrapositive inference for inequality. (Contributed by NM, 1-Jun-2007.) (Proof shortened by Andrew Salmon, 25-May-2011.) (Proof shortened by Wolf Lammen, 22-Nov-2019.) |
Ref | Expression |
---|---|
necon3bi.1 |
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Ref | Expression |
---|---|
necon3bi |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | necon3bi.1 |
. . 3
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2 | 1 | con3i 142 |
. 2
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3 | 2 | neqned 2650 |
1
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