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Mirrors > Home > ILE Home > Th. List > con2b | Unicode version |
Description: Contraposition. Bidirectional version of con2 633. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
con2b |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | con2 633 |
. 2
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2 | con2 633 |
. 2
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3 | 1, 2 | impbii 125 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() ![]() |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 |
This theorem depends on definitions: df-bi 116 |
This theorem is referenced by: mt2bi 674 pm4.15 684 dfdif3 3191 ssconb 3214 disjsn 3593 isprm3 11835 |
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