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Mirrors > Home > NFE Home > Th. List > con3 | Unicode version |
Description: Contraposition. Theorem *2.16 of [WhiteheadRussell] p. 103. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 13-Feb-2013.) |
Ref | Expression |
---|---|
con3 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | id 19 | . 2 | |
2 | 1 | con3d 125 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wn 3 wi 4 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
This theorem is referenced by: pm2.65 164 con34b 283 nic-ax 1438 nic-axALT 1439 exim 1575 hbnt 1775 nfndOLD 1792 hbimdOLD 1816 equsalhwOLD 1839 dvelimv 1939 ax9o 1950 ax11indn 2195 rexim 2718 ralf0 3656 |
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