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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 2936 | . . 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 1541 ≠ wne 2932 |
| 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 2933 |
| This theorem is referenced by: necon2ad 2947 nssne1 3996 nssne2 3997 disjne 4407 nbrne1 5117 nbrne2 5118 peano5 7835 oeeui 8530 domdifsn 8988 ac6sfi 9184 inf3lem2 9538 cnfcom3lem 9612 dfac9 10047 fin23lem21 10249 1re 11132 dedekindle 11297 zneo 12575 modirr 13865 sqrmo 15174 reusq0 15388 pc2dvds 16807 pcadd 16817 oddprmdvds 16831 4sqlem11 16883 latnlej 18379 sylow2blem3 19551 irredn0 20359 irredn1 20362 isnzr2 20451 lssvneln0 20903 lspsnne2 21073 lspfixed 21083 lspindpi 21087 lsmcv 21096 lspsolv 21098 coe1tmmul 22219 dfac14 23562 fbdmn0 23778 filufint 23864 flimfnfcls 23972 alexsubALTlem2 23992 evth 24914 cphsqrtcl2 25142 ovolicc2lem4 25477 lhop1lem 25974 lhop1 25975 lhop2 25976 lhop 25977 deg1add 26064 abelthlem2 26398 logcnlem2 26608 angpined 26796 asinneg 26852 dmgmaddn0 26989 lgsne0 27302 lgsqr 27318 lgsquadlem2 27348 lgsquadlem3 27349 axlowdimlem17 29031 spansncvi 31727 argcj 32828 constrrecl 33926 zarcmplem 34038 broutsideof2 36316 unblimceq0lem 36706 poimirlem28 37849 dvasin 37905 dvacos 37906 nninfnub 37952 dvrunz 38155 lsatcvatlem 39309 lkrlsp2 39363 opnlen0 39448 2llnne2N 39668 lnnat 39687 llnn0 39776 lplnn0N 39807 lplnllnneN 39816 llncvrlpln2 39817 llncvrlpln 39818 lvoln0N 39851 lplncvrlvol2 39875 lplncvrlvol 39876 dalempnes 39911 dalemqnet 39912 dalemcea 39920 dalem3 39924 cdlema1N 40051 cdlemb 40054 paddasslem5 40084 llnexchb2lem 40128 osumcllem4N 40219 pexmidlem1N 40230 lhp2lt 40261 lhp2atne 40294 lhp2at0ne 40296 4atexlemunv 40326 4atexlemex2 40331 trlne 40445 trlval4 40448 cdlemc4 40454 cdleme11dN 40522 cdleme11h 40526 cdlemednuN 40560 cdleme20j 40578 cdleme20k 40579 cdleme21at 40588 cdleme35f 40714 cdlemg11b 40902 dia2dimlem1 41324 dihmeetlem3N 41565 dihmeetlem15N 41581 dochsnnz 41710 dochexmidlem1 41720 dochexmidlem7 41726 mapdindp3 41982 fltne 42887 pellexlem1 43071 dfac21 43308 pm13.14 44650 uzlidlring 48481 suppdm 48756 |
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