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Mirrors > Home > ILE Home > Th. List > necon4biddc | Unicode version |
Description: Contrapositive law deduction for inequality. (Contributed by Jim Kingdon, 19-May-2018.) |
Ref | Expression |
---|---|
necon4biddc.1 | DECID DECID |
Ref | Expression |
---|---|
necon4biddc | DECID DECID |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | necon4biddc.1 | . . 3 DECID DECID | |
2 | df-ne 2246 | . . . 4 | |
3 | 2 | bibi2i 225 | . . 3 |
4 | 1, 3 | syl8ib 164 | . 2 DECID DECID |
5 | 4 | necon4abiddc 2318 | 1 DECID DECID |
Colors of variables: wff set class |
Syntax hints: wn 3 wi 4 wb 103 DECID wdc 775 wceq 1284 wne 2245 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-in2 577 ax-io 662 |
This theorem depends on definitions: df-bi 115 df-dc 776 df-ne 2246 |
This theorem is referenced by: nebidc 2325 |
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