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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 146 | . 2 ⊢ (𝜑 → (¬ 𝜒 → 𝜓)) |
| 4 | 1, 3 | mpd 16 | 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 150 olcnd 890 disjss3 5109 nnsuc 7881 poxp2 8140 frrlem14 8297 unxpdomlem2 9218 oismo 9503 cnfcom3lem 9673 rankelb 9797 fin33i 10354 isf34lem4 10362 canthp1lem2 10639 gchdju1 10642 pwfseqlem3 10646 inttsk 10760 r1tskina 10768 nqereu 10915 zbtwnre 12971 discr1 14277 seqcoll2 14504 bitsfzo 16494 bitsf1 16505 eucalglt 16644 4sqlem17 17022 4sqlem18 17023 ramubcl 17079 psgnunilem5 19565 odnncl 19616 gexnnod 19659 sylow1lem1 19669 torsubg 19925 prmcyg 19965 ablfacrplem 20138 pgpfac1lem2 20148 pgpfac1lem3a 20149 pgpfac1lem3 20150 xrsdsreclblem 21544 prmirredlem 21603 ppttop 23145 pptbas 23146 regr1lem 23877 alexsublem 24182 reconnlem1 24965 metnrmlem1a 24997 vitalilem4 25751 vitalilem5 25752 itg2gt0 25900 rollelem 26129 lhop1lem 26153 coefv0 26386 plyexmo 26455 lgamucov 27180 ppinprm 27294 chtnprm 27296 lgsdir 27474 lgseisenlem1 27517 2sqlem7 27566 2sqblem 27573 pntpbnd1 27728 madebdaylemlrcut 28070 bdayfinbndlem1 28638 dfon2lem8 36258 poimirlem25 38274 fdc 38374 ac6s6 38799 2atm 40279 llnmlplnN 40291 trlval3 40939 cdleme0moN 40977 cdleme18c 41045 qirropth 43615 aacllem 50578 |
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