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Mirrors > Home > MPE Home > Th. List > con2b | Structured version Visualization version Unicode version |
Description: Contraposition. Bidirectional version of con2 130. (Contributed by NM, 12-Mar-1993.) |
Ref | Expression |
---|---|
con2b |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | con2 130 | . 2 | |
2 | con2 130 | . 2 | |
3 | 1, 2 | impbii 199 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wn 3 wi 4 wb 196 |
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 197 |
This theorem is referenced by: mt2bi 353 pm4.15 605 nic-ax 1598 nic-axALT 1599 alimex 1758 ssconb 3743 disjsn 4246 oneqmini 5776 kmlem4 8975 isprm3 15396 bnj1171 31068 bnj1176 31073 bnj1204 31080 bnj1388 31101 bnj1523 31139 wl-nancom 33297 dfxor5 38059 pm13.196a 38615 |
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