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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 888 disjss3 5098 nnsuc 7860 poxp2 8118 frrlem14 8275 unxpdomlem2 9197 oismo 9485 cnfcom3lem 9655 rankelb 9779 fin33i 10323 isf34lem4 10331 canthp1lem2 10608 gchdju1 10611 pwfseqlem3 10615 inttsk 10729 r1tskina 10737 nqereu 10884 zbtwnre 12944 discr1 14249 seqcoll2 14475 bitsfzo 16452 bitsf1 16463 eucalglt 16602 4sqlem17 16980 4sqlem18 16981 ramubcl 17037 psgnunilem5 19517 odnncl 19568 gexnnod 19611 sylow1lem1 19621 torsubg 19877 prmcyg 19917 ablfacrplem 20090 pgpfac1lem2 20100 pgpfac1lem3a 20101 pgpfac1lem3 20102 xrsdsreclblem 21445 prmirredlem 21504 ppttop 23047 pptbas 23048 regr1lem 23779 alexsublem 24084 reconnlem1 24867 metnrmlem1a 24899 vitalilem4 25653 vitalilem5 25654 itg2gt0 25802 rollelem 26031 lhop1lem 26055 coefv0 26288 plyexmo 26354 lgamucov 27079 ppinprm 27193 chtnprm 27195 lgsdir 27373 lgseisenlem1 27416 2sqlem7 27465 2sqblem 27472 pntpbnd1 27627 madebdaylemlrcut 27969 bdayfinbndlem1 28537 dfon2lem8 36102 poimirlem25 38108 fdc 38208 ac6s6 38635 2atm 40115 llnmlplnN 40127 trlval3 40775 cdleme0moN 40813 cdleme18c 40881 qirropth 43449 aacllem 50386 |
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