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Mirrors > Home > NFE Home > Th. List > con34b | Unicode version |
Description: Contraposition. Theorem *4.1 of [WhiteheadRussell] p. 116. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
con34b |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | con3 126 | . 2 | |
2 | ax-3 8 | . 2 | |
3 | 1, 2 | impbii 180 | 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: mtt 329 pm4.14 561 sscon34 3661 evenodddisjlem1 4515 |
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