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| Mirrors > Home > MPE Home > Th. List > necon3bd | Structured version Visualization version GIF version | ||
| Description: Contrapositive law deduction for inequality. (Contributed by NM, 2-Apr-2007.) (Proof shortened by Andrew Salmon, 25-May-2011.) |
| Ref | Expression |
|---|---|
| necon3bd.1 | ⊢ (𝜑 → (𝐴 = 𝐵 → 𝜓)) |
| Ref | Expression |
|---|---|
| necon3bd | ⊢ (𝜑 → (¬ 𝜓 → 𝐴 ≠ 𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nne 2937 | . . 3 ⊢ (¬ 𝐴 ≠ 𝐵 ↔ 𝐴 = 𝐵) | |
| 2 | necon3bd.1 | . . 3 ⊢ (𝜑 → (𝐴 = 𝐵 → 𝜓)) | |
| 3 | 1, 2 | biimtrid 242 | . 2 ⊢ (𝜑 → (¬ 𝐴 ≠ 𝐵 → 𝜓)) |
| 4 | 3 | con1d 145 | 1 ⊢ (𝜑 → (¬ 𝜓 → 𝐴 ≠ 𝐵)) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 = wceq 1542 ≠ wne 2933 |
| 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 207 df-ne 2934 |
| This theorem is referenced by: necon2ad 2948 nssne1 3998 nssne2 3999 disjne 4409 nbrne1 5119 nbrne2 5120 peano5 7845 oeeui 8540 domdifsn 9000 ac6sfi 9196 inf3lem2 9550 cnfcom3lem 9624 dfac9 10059 fin23lem21 10261 1re 11144 dedekindle 11309 zneo 12587 modirr 13877 sqrmo 15186 reusq0 15400 pc2dvds 16819 pcadd 16829 oddprmdvds 16843 4sqlem11 16895 latnlej 18391 sylow2blem3 19563 irredn0 20371 irredn1 20374 isnzr2 20463 lssvneln0 20915 lspsnne2 21085 lspfixed 21095 lspindpi 21099 lsmcv 21108 lspsolv 21110 coe1tmmul 22231 dfac14 23574 fbdmn0 23790 filufint 23876 flimfnfcls 23984 alexsubALTlem2 24004 evth 24926 cphsqrtcl2 25154 ovolicc2lem4 25489 lhop1lem 25986 lhop1 25987 lhop2 25988 lhop 25989 deg1add 26076 abelthlem2 26410 logcnlem2 26620 angpined 26808 asinneg 26864 dmgmaddn0 27001 lgsne0 27314 lgsqr 27330 lgsquadlem2 27360 lgsquadlem3 27361 axlowdimlem17 29043 spansncvi 31739 argcj 32838 constrrecl 33946 zarcmplem 34058 broutsideof2 36335 unblimceq0lem 36725 poimirlem28 37896 dvasin 37952 dvacos 37953 nninfnub 37999 dvrunz 38202 lsatcvatlem 39422 lkrlsp2 39476 opnlen0 39561 2llnne2N 39781 lnnat 39800 llnn0 39889 lplnn0N 39920 lplnllnneN 39929 llncvrlpln2 39930 llncvrlpln 39931 lvoln0N 39964 lplncvrlvol2 39988 lplncvrlvol 39989 dalempnes 40024 dalemqnet 40025 dalemcea 40033 dalem3 40037 cdlema1N 40164 cdlemb 40167 paddasslem5 40197 llnexchb2lem 40241 osumcllem4N 40332 pexmidlem1N 40343 lhp2lt 40374 lhp2atne 40407 lhp2at0ne 40409 4atexlemunv 40439 4atexlemex2 40444 trlne 40558 trlval4 40561 cdlemc4 40567 cdleme11dN 40635 cdleme11h 40639 cdlemednuN 40673 cdleme20j 40691 cdleme20k 40692 cdleme21at 40701 cdleme35f 40827 cdlemg11b 41015 dia2dimlem1 41437 dihmeetlem3N 41678 dihmeetlem15N 41694 dochsnnz 41823 dochexmidlem1 41833 dochexmidlem7 41839 mapdindp3 42095 fltne 42999 pellexlem1 43183 dfac21 43420 pm13.14 44762 uzlidlring 48592 suppdm 48867 |
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