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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 200 | 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 328 mtbiri 329 axc10 2402 pwnss 5253 nsuceq0 6274 onssnel2i 6304 abnex 7482 ssonprc 7510 dmtpos 7907 tfrlem15 8031 tz7.44-2 8046 tz7.48-3 8083 2pwuninel 8675 2pwne 8676 nnsdomg 8780 r111 9207 r1pwss 9216 wfelirr 9257 rankxplim3 9313 carduni 9413 pr2ne 9434 alephle 9517 alephfp 9537 pwdjudom 9641 cfsuc 9682 fin23lem28 9765 fin23lem30 9767 isfin1-2 9810 ac5b 9903 zorn2lem4 9924 zorn2lem7 9927 cfpwsdom 10009 nd1 10012 nd2 10013 canthp1 10079 pwfseqlem1 10083 gchhar 10104 winalim2 10121 ltxrlt 10714 recgt0 11489 nnunb 11896 indstr 12319 wrdlen2i 14307 rlimno1 15013 lcmfnncl 15976 isprm2 16029 nprmdvds1 16053 divgcdodd 16057 coprm 16058 ramtcl2 16350 psgnunilem3 18627 torsubg 18977 prmcyg 19017 dprd2da 19167 prmirredlem 20643 pnfnei 21831 mnfnei 21832 1stccnp 22073 uzfbas 22509 ufinffr 22540 fin1aufil 22543 ovolunlem1a 24100 itg2gt0 24364 lgsquad2lem2 25964 dirith2 26107 umgrnloop0 26897 usgrnloop0ALT 26990 nfrgr2v 28054 hon0 29573 ifeqeqx 30300 dfon2lem7 33038 soseq 33100 noseponlem 33175 nosepssdm 33194 nodenselem8 33199 nolt02o 33203 bj-axc10v 34119 bj-nsnid 34366 areacirclem4 34989 fdc 35024 dihglblem6 38480 sbn1 39108 pellexlem6 39437 pw2f1ocnv 39640 wepwsolem 39648 inaex 40639 axc5c4c711toc5 40740 lptioo2 41918 lptioo1 41919 1neven 44210 |
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