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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 2991 | . . 3 ⊢ (¬ 𝐴 ≠ 𝐵 ↔ 𝐴 = 𝐵) | |
2 | necon3bd.1 | . . 3 ⊢ (𝜑 → (𝐴 = 𝐵 → 𝜓)) | |
3 | 1, 2 | syl5bi 245 | . 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 1538 ≠ wne 2987 |
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 2988 |
This theorem is referenced by: necon2ad 3002 nssne1 3975 nssne2 3976 disjne 4362 nbrne1 5049 nbrne2 5050 peano5 7585 oeeui 8211 domdifsn 8583 ac6sfi 8746 inf3lem2 9076 cnfcom3lem 9150 dfac9 9547 fin23lem21 9750 dedekindle 10793 zneo 12053 modirr 13305 sqrmo 14603 reusq0 14814 pc2dvds 16205 pcadd 16215 oddprmdvds 16229 4sqlem11 16281 latnlej 17670 sylow2blem3 18739 irredn0 19449 irredn1 19452 lssvneln0 19716 lspsnne2 19883 lspfixed 19893 lspindpi 19897 lsmcv 19906 lspsolv 19908 isnzr2 20029 coe1tmmul 20906 dfac14 22223 fbdmn0 22439 filufint 22525 flimfnfcls 22633 alexsubALTlem2 22653 evth 23564 cphsqrtcl2 23791 ovolicc2lem4 24124 lhop1lem 24616 lhop1 24617 lhop2 24618 lhop 24619 deg1add 24704 abelthlem2 25027 logcnlem2 25234 angpined 25416 asinneg 25472 dmgmaddn0 25608 lgsne0 25919 lgsqr 25935 lgsquadlem2 25965 lgsquadlem3 25966 axlowdimlem17 26752 spansncvi 29435 zarcmplem 31234 broutsideof2 33696 unblimceq0lem 33958 poimirlem28 35085 dvasin 35141 dvacos 35142 nninfnub 35189 dvrunz 35392 lsatcvatlem 36345 lkrlsp2 36399 opnlen0 36484 2llnne2N 36704 lnnat 36723 llnn0 36812 lplnn0N 36843 lplnllnneN 36852 llncvrlpln2 36853 llncvrlpln 36854 lvoln0N 36887 lplncvrlvol2 36911 lplncvrlvol 36912 dalempnes 36947 dalemqnet 36948 dalemcea 36956 dalem3 36960 cdlema1N 37087 cdlemb 37090 paddasslem5 37120 llnexchb2lem 37164 osumcllem4N 37255 pexmidlem1N 37266 lhp2lt 37297 lhp2atne 37330 lhp2at0ne 37332 4atexlemunv 37362 4atexlemex2 37367 trlne 37481 trlval4 37484 cdlemc4 37490 cdleme11dN 37558 cdleme11h 37562 cdlemednuN 37596 cdleme20j 37614 cdleme20k 37615 cdleme21at 37624 cdleme35f 37750 cdlemg11b 37938 dia2dimlem1 38360 dihmeetlem3N 38601 dihmeetlem15N 38617 dochsnnz 38746 dochexmidlem1 38756 dochexmidlem7 38762 mapdindp3 39018 fltne 39616 pellexlem1 39770 dfac21 40010 pm13.14 41113 uzlidlring 44553 suppdm 44919 |
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