Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > ILE Home > Th. List > con2b | Unicode version |
Description: Contraposition. Bidirectional version of con2 638. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
con2b |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | con2 638 | . 2 | |
2 | con2 638 | . 2 | |
3 | 1, 2 | impbii 125 | 1 |
Colors of variables: wff set class |
Syntax hints: wn 3 wi 4 wb 104 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia2 106 ax-ia3 107 ax-in1 609 ax-in2 610 |
This theorem depends on definitions: df-bi 116 |
This theorem is referenced by: mt2bi 679 pm4.15 689 dfdif3 3237 ssconb 3260 disjsn 3645 isprm3 12072 |
Copyright terms: Public domain | W3C validator |