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Mirrors > Home > QLE Home > Th. List > wcon3 | Unicode version |
Description: Weak contraposition. |
Ref | Expression |
---|---|
wcon3.1 |
Ref | Expression |
---|---|
wcon3 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ax-a1 30 | . . . . 5 | |
2 | 1 | ax-r1 35 | . . . 4 |
3 | 2 | lbi 97 | . . 3 |
4 | wcon3.1 | . . 3 | |
5 | 3, 4 | ax-r2 36 | . 2 |
6 | 5 | wcon1 207 | 1 |
Colors of variables: term |
Syntax hints: wb 1 wn 4 tb 5 wt 8 |
This theorem was proved from axioms: ax-a1 30 ax-a2 31 ax-r1 35 ax-r2 36 ax-r4 37 ax-r5 38 |
This theorem depends on definitions: df-b 39 df-a 40 |
This theorem is referenced by: wlecon 395 wcomd 418 wfh1 423 |
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