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Mirrors > Home > MPE Home > Th. List > mtbir | Structured version Visualization version GIF version |
Description: An inference from a biconditional, related to modus tollens. (Contributed by NM, 15-Nov-1994.) (Proof shortened by Wolf Lammen, 14-Oct-2012.) |
Ref | Expression |
---|---|
mtbir.1 | ⊢ ¬ 𝜓 |
mtbir.2 | ⊢ (𝜑 ↔ 𝜓) |
Ref | Expression |
---|---|
mtbir | ⊢ ¬ 𝜑 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | mtbir.1 | . 2 ⊢ ¬ 𝜓 | |
2 | mtbir.2 | . . 3 ⊢ (𝜑 ↔ 𝜓) | |
3 | 2 | bicomi 226 | . 2 ⊢ (𝜓 ↔ 𝜑) |
4 | 1, 3 | mtbi 324 | 1 ⊢ ¬ 𝜑 |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ↔ wb 208 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
This theorem depends on definitions: df-bi 209 |
This theorem is referenced by: fal 1551 eqneltri 2906 nemtbir 3112 ru 3771 pssirr 4077 indifdir 4260 noel 4296 noelOLD 4297 iun0 4985 0iun 4986 br0 5115 vprc 5219 iin0 5261 nfnid 5276 opelopabsb 5417 0nelxp 5589 0xp 5649 nrelv 5673 dm0 5790 cnv0 5999 co02 6113 nlim0 6249 snsn0non 6309 imadif 6438 0fv 6709 tz7.44lem1 8041 canth2 8670 canthp1lem2 10075 pwxpndom2 10087 adderpq 10378 mulerpq 10379 0ncn 10555 ax1ne0 10582 inelr 11628 xrltnr 12515 fzouzdisj 13074 lsw0 13917 eirr 15558 ruc 15596 aleph1re 15598 sqrt2irr 15602 n2dvds1 15717 n2dvds3 15721 sadc0 15803 1nprm 16023 meet0 17747 join0 17748 smndex1n0mnd 18077 nsmndex1 18078 smndex2dnrinv 18080 odhash 18699 cnfldfunALT 20558 zringndrg 20637 zfbas 22504 ustn0 22829 zclmncvs 23752 lhop 24613 dvrelog 25220 axlowdimlem13 26740 ntrl2v2e 27937 konigsberglem4 28034 avril1 28242 helloworld 28244 topnfbey 28248 vsfval 28410 dmadjrnb 29683 xrge00 30673 esumrnmpt2 31327 measvuni 31473 sibf0 31592 ballotlem4 31756 signswch 31831 bnj521 32007 satf0n0 32625 fmlaomn0 32637 gonan0 32639 goaln0 32640 fmla0disjsuc 32645 3pm3.2ni 32943 elpotr 33026 dfon2lem7 33034 poseq 33095 nosgnn0 33165 sltsolem1 33180 linedegen 33604 nmotru 33756 subsym1 33775 limsucncmpi 33793 bj-ru1 34257 bj-0nel1 34268 bj-inftyexpitaudisj 34490 bj-pinftynminfty 34512 bj-isrvec 34578 finxp0 34675 poimirlem30 34937 coss0 35734 epnsymrel 35813 diophren 39430 stoweidlem44 42349 fourierdlem62 42473 salexct2 42642 aisbnaxb 43167 dandysum2p2e4 43254 iota0ndef 43294 aiota0ndef 43315 257prm 43743 fmtno4nprmfac193 43756 139prmALT 43779 31prm 43780 127prm 43783 nnsum4primeseven 43985 nnsum4primesevenALTV 43986 0nodd 44097 2nodd 44099 1neven 44223 2zrngnring 44243 ex-gt 44847 alsi-no-surprise 44917 |
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