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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 2929 | . . 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 1540 ≠ wne 2925 |
| 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 2926 |
| This theorem is referenced by: necon2ad 2940 nssne1 3998 nssne2 3999 disjne 4406 nbrne1 5111 nbrne2 5112 peano5 7826 oeeui 8520 domdifsn 8977 ac6sfi 9173 inf3lem2 9525 cnfcom3lem 9599 dfac9 10031 fin23lem21 10233 1re 11115 dedekindle 11280 zneo 12559 modirr 13849 sqrmo 15158 reusq0 15372 pc2dvds 16791 pcadd 16801 oddprmdvds 16815 4sqlem11 16867 latnlej 18362 sylow2blem3 19501 irredn0 20308 irredn1 20311 isnzr2 20403 lssvneln0 20855 lspsnne2 21025 lspfixed 21035 lspindpi 21039 lsmcv 21048 lspsolv 21050 coe1tmmul 22161 dfac14 23503 fbdmn0 23719 filufint 23805 flimfnfcls 23913 alexsubALTlem2 23933 evth 24856 cphsqrtcl2 25084 ovolicc2lem4 25419 lhop1lem 25916 lhop1 25917 lhop2 25918 lhop 25919 deg1add 26006 abelthlem2 26340 logcnlem2 26550 angpined 26738 asinneg 26794 dmgmaddn0 26931 lgsne0 27244 lgsqr 27260 lgsquadlem2 27290 lgsquadlem3 27291 axlowdimlem17 28903 spansncvi 31596 argcj 32692 constrrecl 33736 zarcmplem 33848 broutsideof2 36096 unblimceq0lem 36480 poimirlem28 37628 dvasin 37684 dvacos 37685 nninfnub 37731 dvrunz 37934 lsatcvatlem 39028 lkrlsp2 39082 opnlen0 39167 2llnne2N 39387 lnnat 39406 llnn0 39495 lplnn0N 39526 lplnllnneN 39535 llncvrlpln2 39536 llncvrlpln 39537 lvoln0N 39570 lplncvrlvol2 39594 lplncvrlvol 39595 dalempnes 39630 dalemqnet 39631 dalemcea 39639 dalem3 39643 cdlema1N 39770 cdlemb 39773 paddasslem5 39803 llnexchb2lem 39847 osumcllem4N 39938 pexmidlem1N 39949 lhp2lt 39980 lhp2atne 40013 lhp2at0ne 40015 4atexlemunv 40045 4atexlemex2 40050 trlne 40164 trlval4 40167 cdlemc4 40173 cdleme11dN 40241 cdleme11h 40245 cdlemednuN 40279 cdleme20j 40297 cdleme20k 40298 cdleme21at 40307 cdleme35f 40433 cdlemg11b 40621 dia2dimlem1 41043 dihmeetlem3N 41284 dihmeetlem15N 41300 dochsnnz 41429 dochexmidlem1 41439 dochexmidlem7 41445 mapdindp3 41701 fltne 42617 pellexlem1 42802 dfac21 43039 pm13.14 44382 uzlidlring 48219 suppdm 48495 |
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