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Mirrors > Home > ILE Home > Th. List > con2b | Unicode version |
Description: Contraposition. Bidirectional version of con2 572. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
con2b |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | con2 572 | . 2 | |
2 | con2 572 | . 2 | |
3 | 1, 2 | impbii 117 | 1 |
Colors of variables: wff set class |
Syntax hints: wn 3 wi 4 wb 98 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia2 100 ax-ia3 101 ax-in1 544 ax-in2 545 |
This theorem depends on definitions: df-bi 110 |
This theorem is referenced by: mt2bi 609 pm4.15 789 ssconb 3076 disjsn 3432 |
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