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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 878 disjss3 5084 nnsuc 7835 poxp2 8093 frrlem14 8249 unxpdomlem2 9167 oismo 9455 cnfcom3lem 9624 rankelb 9748 fin33i 10291 isf34lem4 10299 canthp1lem2 10576 gchdju1 10579 pwfseqlem3 10583 inttsk 10697 r1tskina 10705 nqereu 10852 zbtwnre 12896 discr1 14201 seqcoll2 14427 bitsfzo 16404 bitsf1 16415 eucalglt 16554 4sqlem17 16932 4sqlem18 16933 ramubcl 16989 psgnunilem5 19469 odnncl 19520 gexnnod 19563 sylow1lem1 19573 torsubg 19829 prmcyg 19869 ablfacrplem 20042 pgpfac1lem2 20052 pgpfac1lem3a 20053 pgpfac1lem3 20054 xrsdsreclblem 21393 prmirredlem 21452 ppttop 22972 pptbas 22973 regr1lem 23704 alexsublem 24009 reconnlem1 24792 metnrmlem1a 24824 vitalilem4 25578 vitalilem5 25579 itg2gt0 25727 rollelem 25956 lhop1lem 25980 coefv0 26213 plyexmo 26279 lgamucov 27001 ppinprm 27115 chtnprm 27117 lgsdir 27295 lgseisenlem1 27338 2sqlem7 27387 2sqblem 27394 pntpbnd1 27549 madebdaylemlrcut 27891 bdayfinbndlem1 28459 dfon2lem8 35970 poimirlem25 37966 fdc 38066 ac6s6 38493 2atm 39973 llnmlplnN 39985 trlval3 40633 cdleme0moN 40671 cdleme18c 40739 qirropth 43336 aacllem 50276 |
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