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Mirrors > Home > MPE Home > Th. List > mtoi | Structured version Visualization version GIF version |
Description: Modus tollens inference. (Contributed by NM, 5-Jul-1994.) (Proof shortened by Wolf Lammen, 15-Sep-2012.) |
Ref | Expression |
---|---|
mtoi.1 | ⊢ ¬ 𝜒 |
mtoi.2 | ⊢ (𝜑 → (𝜓 → 𝜒)) |
Ref | Expression |
---|---|
mtoi | ⊢ (𝜑 → ¬ 𝜓) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | mtoi.1 | . . 3 ⊢ ¬ 𝜒 | |
2 | 1 | a1i 11 | . 2 ⊢ (𝜑 → ¬ 𝜒) |
3 | mtoi.2 | . 2 ⊢ (𝜑 → (𝜓 → 𝜒)) | |
4 | 2, 3 | mtod 201 | 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: mtbii 329 mtbiri 330 axc10 2392 pwnss 5215 nsuceq0 6239 onssnel2i 6269 abnex 7459 ssonprc 7487 dmtpos 7887 tfrlem15 8011 tz7.44-2 8026 tz7.48-3 8063 2pwuninel 8656 2pwne 8657 nnsdomg 8761 r111 9188 r1pwss 9197 wfelirr 9238 rankxplim3 9294 carduni 9394 pr2ne 9416 alephle 9499 alephfp 9519 pwdjudom 9627 cfsuc 9668 fin23lem28 9751 fin23lem30 9753 isfin1-2 9796 ac5b 9889 zorn2lem4 9910 zorn2lem7 9913 cfpwsdom 9995 nd1 9998 nd2 9999 canthp1 10065 pwfseqlem1 10069 gchhar 10090 winalim2 10107 ltxrlt 10700 recgt0 11475 nnunb 11881 indstr 12304 wrdlen2i 14295 rlimno1 15002 lcmfnncl 15963 isprm2 16016 nprmdvds1 16040 divgcdodd 16044 coprm 16045 ramtcl2 16337 psgnunilem3 18616 torsubg 18967 prmcyg 19007 dprd2da 19157 prmirredlem 20186 pnfnei 21825 mnfnei 21826 1stccnp 22067 uzfbas 22503 ufinffr 22534 fin1aufil 22537 ovolunlem1a 24100 itg2gt0 24364 lgsquad2lem2 25969 dirith2 26112 umgrnloop0 26902 usgrnloop0ALT 26995 nfrgr2v 28057 hon0 29576 ifeqeqx 30309 dfon2lem7 33147 soseq 33209 noseponlem 33284 nosepssdm 33303 nodenselem8 33308 nolt02o 33312 bj-axc10v 34230 bj-nsnid 34486 areacirclem4 35148 fdc 35183 dihglblem6 38636 sbn1 39394 sn-inelr 39590 itrere 39591 retire 39592 pellexlem6 39775 pw2f1ocnv 39978 wepwsolem 39986 inaex 41005 axc5c4c711toc5 41106 lptioo2 42273 lptioo1 42274 1neven 44556 |
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