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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 5112 nnsuc 7880 poxp2 8139 frrlem14 8296 unxpdomlem2 9217 oismo 9502 cnfcom3lem 9672 rankelb 9796 fin33i 10353 isf34lem4 10361 canthp1lem2 10638 gchdju1 10641 pwfseqlem3 10645 inttsk 10759 r1tskina 10767 nqereu 10914 zbtwnre 12970 discr1 14275 seqcoll2 14502 bitsfzo 16493 bitsf1 16504 eucalglt 16643 4sqlem17 17021 4sqlem18 17022 ramubcl 17078 psgnunilem5 19564 odnncl 19615 gexnnod 19658 sylow1lem1 19668 torsubg 19924 prmcyg 19964 ablfacrplem 20137 pgpfac1lem2 20147 pgpfac1lem3a 20148 pgpfac1lem3 20149 xrsdsreclblem 21532 prmirredlem 21591 ppttop 23133 pptbas 23134 regr1lem 23865 alexsublem 24170 reconnlem1 24953 metnrmlem1a 24985 vitalilem4 25739 vitalilem5 25740 itg2gt0 25888 rollelem 26117 lhop1lem 26141 coefv0 26374 plyexmo 26443 lgamucov 27168 ppinprm 27282 chtnprm 27284 lgsdir 27462 lgseisenlem1 27505 2sqlem7 27554 2sqblem 27561 pntpbnd1 27716 madebdaylemlrcut 28058 bdayfinbndlem1 28626 dfon2lem8 36179 poimirlem25 38184 fdc 38284 ac6s6 38711 2atm 40191 llnmlplnN 40203 trlval3 40851 cdleme0moN 40889 cdleme18c 40957 qirropth 43527 aacllem 50475 |
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