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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 147 | . 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 151 nsyl2OLD 152 olcnd 873 ecase23d 1469 disjss3 5065 nnsuc 7597 unxpdomlem2 8723 oismo 9004 cnfcom3lem 9166 rankelb 9253 fin33i 9791 isf34lem4 9799 canthp1lem2 10075 gchdju1 10078 pwfseqlem3 10082 inttsk 10196 r1tskina 10204 nqereu 10351 zbtwnre 12347 discr1 13601 seqcoll2 13824 bitsfzo 15784 bitsf1 15795 eucalglt 15929 4sqlem17 16297 4sqlem18 16298 ramubcl 16354 psgnunilem5 18622 odnncl 18673 gexnnod 18713 sylow1lem1 18723 torsubg 18974 prmcyg 19014 ablfacrplem 19187 pgpfac1lem2 19197 pgpfac1lem3a 19198 pgpfac1lem3 19199 xrsdsreclblem 20591 prmirredlem 20640 ppttop 21615 pptbas 21616 regr1lem 22347 alexsublem 22652 reconnlem1 23434 metnrmlem1a 23466 vitalilem4 24212 vitalilem5 24213 itg2gt0 24361 rollelem 24586 lhop1lem 24610 coefv0 24838 plyexmo 24902 lgamucov 25615 ppinprm 25729 chtnprm 25731 lgsdir 25908 lgseisenlem1 25951 2sqlem7 26000 2sqblem 26007 pntpbnd1 26162 dfon2lem8 33035 frrlem14 33136 poimirlem25 34932 fdc 35035 ac6s6 35465 2atm 36678 llnmlplnN 36690 trlval3 37338 cdleme0moN 37376 cdleme18c 37444 qirropth 39525 aacllem 44922 |
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