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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 3020 | . . 3 ⊢ (¬ 𝐴 ≠ 𝐵 ↔ 𝐴 = 𝐵) | |
2 | necon3bd.1 | . . 3 ⊢ (𝜑 → (𝐴 = 𝐵 → 𝜓)) | |
3 | 1, 2 | syl5bi 244 | . 2 ⊢ (𝜑 → (¬ 𝐴 ≠ 𝐵 → 𝜓)) |
4 | 3 | con1d 147 | 1 ⊢ (𝜑 → (¬ 𝜓 → 𝐴 ≠ 𝐵)) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 = wceq 1537 ≠ wne 3016 |
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 df-ne 3017 |
This theorem is referenced by: necon2ad 3031 nelne1OLD 3114 nelne2OLD 3116 nssne1 4027 nssne2 4028 disjne 4404 nbrne1 5085 nbrne2 5086 peano5 7605 oeeui 8228 domdifsn 8600 ac6sfi 8762 inf3lem2 9092 cnfcom3lem 9166 dfac9 9562 fin23lem21 9761 dedekindle 10804 zneo 12066 modirr 13311 sqrmo 14611 reusq0 14822 pc2dvds 16215 pcadd 16225 oddprmdvds 16239 4sqlem11 16291 latnlej 17678 sylow2blem3 18747 irredn0 19453 irredn1 19456 lssvneln0 19723 lspsnne2 19890 lspfixed 19900 lspindpi 19904 lsmcv 19913 lspsolv 19915 isnzr2 20036 coe1tmmul 20445 dfac14 22226 fbdmn0 22442 filufint 22528 flimfnfcls 22636 alexsubALTlem2 22656 evth 23563 cphsqrtcl2 23790 ovolicc2lem4 24121 lhop1lem 24610 lhop1 24611 lhop2 24612 lhop 24613 deg1add 24697 abelthlem2 25020 logcnlem2 25226 angpined 25408 asinneg 25464 dmgmaddn0 25600 lgsne0 25911 lgsqr 25927 lgsquadlem2 25957 lgsquadlem3 25958 axlowdimlem17 26744 spansncvi 29429 broutsideof2 33583 unblimceq0lem 33845 poimirlem28 34935 dvasin 34993 dvacos 34994 nninfnub 35041 dvrunz 35247 lsatcvatlem 36200 lkrlsp2 36254 opnlen0 36339 2llnne2N 36559 lnnat 36578 llnn0 36667 lplnn0N 36698 lplnllnneN 36707 llncvrlpln2 36708 llncvrlpln 36709 lvoln0N 36742 lplncvrlvol2 36766 lplncvrlvol 36767 dalempnes 36802 dalemqnet 36803 dalemcea 36811 dalem3 36815 cdlema1N 36942 cdlemb 36945 paddasslem5 36975 llnexchb2lem 37019 osumcllem4N 37110 pexmidlem1N 37121 lhp2lt 37152 lhp2atne 37185 lhp2at0ne 37187 4atexlemunv 37217 4atexlemex2 37222 trlne 37336 trlval4 37339 cdlemc4 37345 cdleme11dN 37413 cdleme11h 37417 cdlemednuN 37451 cdleme20j 37469 cdleme20k 37470 cdleme21at 37479 cdleme35f 37605 cdlemg11b 37793 dia2dimlem1 38215 dihmeetlem3N 38456 dihmeetlem15N 38472 dochsnnz 38601 dochexmidlem1 38611 dochexmidlem7 38617 mapdindp3 38873 fltne 39292 pellexlem1 39446 dfac21 39686 pm13.14 40761 uzlidlring 44220 suppdm 44585 |
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