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Mirrors > Home > NFE Home > Th. List > con1bid | Unicode version |
Description: A contraposition deduction. (Contributed by NM, 9-Oct-1999.) |
Ref | Expression |
---|---|
con1bid.1 |
Ref | Expression |
---|---|
con1bid |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | con1bid.1 | . . . 4 | |
2 | 1 | bicomd 192 | . . 3 |
3 | 2 | con2bid 319 | . 2 |
4 | 3 | bicomd 192 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wn 3 wi 4 wb 176 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
This theorem depends on definitions: df-bi 177 |
This theorem is referenced by: pm5.18 345 necon1abid 2569 necon1bbid 2570 opkelimagekg 4271 |
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