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Mirrors > Home > QLE Home > Th. List > wcon | Unicode version |
Description: Contraposition law. |
Ref | Expression |
---|---|
wcon |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | conb 122 | . 2 | |
2 | 1 | bi1 118 | 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-a5 34 ax-r1 35 ax-r2 36 ax-r4 37 ax-r5 38 |
This theorem depends on definitions: df-b 39 df-a 40 df-t 41 df-f 42 |
This theorem is referenced by: (None) |
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