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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 2962 | . . 3 ⊢ (¬ 𝐴 ≠ 𝐵 ↔ 𝐴 = 𝐵) | |
| 2 | necon3bd.1 | . . 3 ⊢ (𝜑 → (𝐴 = 𝐵 → 𝜓)) | |
| 3 | 1, 2 | biimtrid 245 | . 2 ⊢ (𝜑 → (¬ 𝐴 ≠ 𝐵 → 𝜓)) |
| 4 | 3 | con1d 146 | 1 ⊢ (𝜑 → (¬ 𝜓 → 𝐴 ≠ 𝐵)) |
| Colors of variables: wff setvar class |
| Syntax hints: ¬ wn 3 → wi 4 = wceq 1570 ≠ wne 2958 |
| 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 210 df-ne 2959 |
| This theorem is referenced by: necon2ad 2973 nssne1 4000 nssne2 4001 disjne 4416 nbrne1 5131 nbrne2 5132 peano5 7891 oeeui 8589 domdifsn 9049 ac6sfi 9245 inf3lem2 9599 cnfcom3lem 9673 dfac9 10121 fin23lem21 10324 1re 11209 dedekindle 11375 zneo 12680 modirr 13980 sqrmo 15304 reusq0 15518 pc2dvds 16940 pcadd 16950 oddprmdvds 16964 4sqlem11 17016 latnlej 18513 sylow2blem3 19693 irredn0 20506 irredn1 20509 isnzr2 20602 lssvneln0 21054 lspsnne2 21223 lspfixed 21233 lspindpi 21237 lsmcv 21246 lspsolv 21248 coe1tmmul 22419 dfac14 23756 fbdmn0 23972 filufint 24058 flimfnfcls 24166 alexsubALTlem2 24186 evth 25099 cphsqrtcl2 25326 ovolicc2lem4 25660 lhop1lem 26153 lhop1 26154 lhop2 26155 lhop 26156 deg1add 26241 abelthlem2 26573 logcnlem2 26786 angpined 26973 asinneg 27029 dmgmaddn0 27165 lgsne0 27477 lgsqr 27493 lgsquadlem2 27523 lgsquadlem3 27524 axlowdimlem17 29286 spansncvi 31982 argcj 33071 constrrecl 34137 zarcmplem 34249 nelscottrankgt 35496 broutsideof2 36592 unblimceq0lem 37073 poimirlem28 38277 dvasin 38333 dvacos 38334 nninfnub 38380 dvrunz 38583 lsatcvatlem 39801 lkrlsp2 39855 opnlen0 39940 2llnne2N 40160 lnnat 40179 llnn0 40268 lplnn0N 40299 lplnllnneN 40308 llncvrlpln2 40309 llncvrlpln 40310 lvoln0N 40343 lplncvrlvol2 40367 lplncvrlvol 40368 dalempnes 40403 dalemqnet 40404 dalemcea 40412 dalem3 40416 cdlema1N 40543 cdlemb 40546 paddasslem5 40576 llnexchb2lem 40620 osumcllem4N 40711 pexmidlem1N 40722 lhp2lt 40753 lhp2atne 40786 lhp2at0ne 40788 4atexlemunv 40818 4atexlemex2 40823 trlne 40937 trlval4 40940 cdlemc4 40946 cdleme11dN 41014 cdleme11h 41018 cdlemednuN 41052 cdleme20j 41070 cdleme20k 41071 cdleme21at 41080 cdleme35f 41206 cdlemg11b 41394 dia2dimlem1 41816 dihmeetlem3N 42057 dihmeetlem15N 42073 dochsnnz 42202 dochexmidlem1 42212 dochexmidlem7 42218 mapdindp3 42474 fltne 43356 pellexlem1 43536 dfac21 43773 pm13.14 45099 uzlidlring 48977 suppdm 49267 |
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