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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 188 | 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 315 mtbiri 316 axc10 2240 pwnss 4756 eunex 4785 nsuceq0 5722 onssnel2i 5755 ssonprc 6884 reldmtpos 7247 dmtpos 7251 tfrlem15 7375 tz7.44-2 7390 tz7.48-3 7426 2pwuninel 8000 2pwne 8001 nnsdomg 8104 r111 8521 r1pwss 8530 wfelirr 8571 rankxplim3 8627 carduni 8690 pr2ne 8711 alephle 8794 alephfp 8814 pwcdadom 8921 cfsuc 8962 fin23lem28 9045 fin23lem30 9047 isfin1-2 9090 ac5b 9183 zorn2lem4 9204 zorn2lem7 9207 cfpwsdom 9285 nd1 9288 nd2 9289 canthp1 9355 pwfseqlem1 9359 gchhar 9380 winalim2 9397 ltxrlt 9987 recgt0 10746 nnunb 11165 indstr 11632 wrdlen2i 13534 rlimno1 14232 lcmfnncl 15180 isprm2 15233 nprmdvds1 15256 divgcdodd 15260 coprm 15261 ramtcl2 15553 psgnunilem3 17739 torsubg 18080 prmcyg 18118 dprd2da 18264 prmirredlem 19660 pnfnei 20834 mnfnei 20835 1stccnp 21075 uzfbas 21512 ufinffr 21543 fin1aufil 21546 ovolunlem1a 23071 itg2gt0 23333 lgsquad2lem2 24910 dirith2 25017 umgrnloop0 25775 usgranloop0 25909 nbgranself2 25965 frgra2v 26526 hon0 28036 ifeqeqx 28745 dfon2lem7 30938 soseq 30995 noseponlem 31065 nodenselem3 31082 nodenselem8 31087 bj-axc10v 31904 bj-eunex 31987 areacirclem4 32673 fdc 32711 dihglblem6 35647 pellexlem6 36416 pw2f1ocnv 36622 wepwsolem 36630 axc5c4c711toc5 37625 lptioo2 38698 lptioo1 38699 usgrnloop0ALT 40432 nfrgr2v 41442 1neven 41722 ssdifsn 42228 |
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