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| Mirrors > Home > MPE Home > Th. List > mt3d | Structured version Visualization version GIF version | ||
| Description: Modus tollens deduction. (Contributed by NM, 26-Mar-1995.) |
| Ref | Expression |
|---|---|
| mt3d.1 | ⊢ (𝜑 → ¬ 𝜒) |
| mt3d.2 | ⊢ (𝜑 → (¬ 𝜓 → 𝜒)) |
| Ref | Expression |
|---|---|
| mt3d | ⊢ (𝜑 → 𝜓) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | mt3d.1 | . 2 ⊢ (𝜑 → ¬ 𝜒) | |
| 2 | mt3d.2 | . . 3 ⊢ (𝜑 → (¬ 𝜓 → 𝜒)) | |
| 3 | 2 | con1d 145 | . 2 ⊢ (𝜑 → (¬ 𝜒 → 𝜓)) |
| 4 | 1, 3 | mpd 15 | 1 ⊢ (𝜑 → 𝜓) |
| 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: mt3i 149 olcnd 877 disjss3 5097 nnsuc 7826 poxp2 8085 frrlem14 8241 unxpdomlem2 9157 oismo 9445 cnfcom3lem 9612 rankelb 9736 fin33i 10279 isf34lem4 10287 canthp1lem2 10564 gchdju1 10567 pwfseqlem3 10571 inttsk 10685 r1tskina 10693 nqereu 10840 zbtwnre 12859 discr1 14162 seqcoll2 14388 bitsfzo 16362 bitsf1 16373 eucalglt 16512 4sqlem17 16889 4sqlem18 16890 ramubcl 16946 psgnunilem5 19423 odnncl 19474 gexnnod 19517 sylow1lem1 19527 torsubg 19783 prmcyg 19823 ablfacrplem 19996 pgpfac1lem2 20006 pgpfac1lem3a 20007 pgpfac1lem3 20008 xrsdsreclblem 21367 prmirredlem 21427 ppttop 22951 pptbas 22952 regr1lem 23683 alexsublem 23988 reconnlem1 24771 metnrmlem1a 24803 vitalilem4 25568 vitalilem5 25569 itg2gt0 25717 rollelem 25949 lhop1lem 25974 coefv0 26209 plyexmo 26277 lgamucov 27004 ppinprm 27118 chtnprm 27120 lgsdir 27299 lgseisenlem1 27342 2sqlem7 27391 2sqblem 27398 pntpbnd1 27553 madebdaylemlrcut 27895 bdayfinbndlem1 28463 dfon2lem8 35982 poimirlem25 37842 fdc 37942 ac6s6 38369 2atm 39783 llnmlplnN 39795 trlval3 40443 cdleme0moN 40481 cdleme18c 40549 qirropth 43146 aacllem 50042 |
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