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Mirrors > Home > MPE Home > Th. List > elimel | Structured version Visualization version GIF version |
Description: Eliminate a membership hypothesis for weak deduction theorem, when special case 𝐵 ∈ 𝐶 is provable. (Contributed by NM, 15-May-1999.) |
Ref | Expression |
---|---|
elimel.1 | ⊢ 𝐵 ∈ 𝐶 |
Ref | Expression |
---|---|
elimel | ⊢ if(𝐴 ∈ 𝐶, 𝐴, 𝐵) ∈ 𝐶 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eleq1 2900 | . 2 ⊢ (𝐴 = if(𝐴 ∈ 𝐶, 𝐴, 𝐵) → (𝐴 ∈ 𝐶 ↔ if(𝐴 ∈ 𝐶, 𝐴, 𝐵) ∈ 𝐶)) | |
2 | eleq1 2900 | . 2 ⊢ (𝐵 = if(𝐴 ∈ 𝐶, 𝐴, 𝐵) → (𝐵 ∈ 𝐶 ↔ if(𝐴 ∈ 𝐶, 𝐴, 𝐵) ∈ 𝐶)) | |
3 | elimel.1 | . 2 ⊢ 𝐵 ∈ 𝐶 | |
4 | 1, 2, 3 | elimhyp 4530 | 1 ⊢ if(𝐴 ∈ 𝐶, 𝐴, 𝐵) ∈ 𝐶 |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2110 ifcif 4467 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-ext 2793 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-ex 1777 df-sb 2066 df-clab 2800 df-cleq 2814 df-clel 2893 df-if 4468 |
This theorem is referenced by: fprg 6912 orduninsuc 7552 oawordeu 8175 oeoa 8217 omopth 8279 unfilem3 8778 inar1 10191 supsr 10528 renegcl 10943 peano5uzti 12066 eluzadd 12267 eluzsub 12268 ltweuz 13323 uzenom 13326 seqfn 13375 seq1 13376 seqp1 13378 sqeqor 13572 binom2 13573 nn0opth2 13626 faclbnd4lem2 13648 hashxp 13789 dvdsle 15654 divalglem7 15744 divalg 15748 gcdaddm 15867 smadiadetr 21278 iblcnlem 24383 ax5seglem8 26716 elimnv 28454 elimnvu 28455 nmlno0i 28565 nmblolbi 28571 blocn 28578 elimphu 28592 ubth 28644 htth 28689 ifhvhv0 28793 normlem6 28886 norm-iii 28911 norm3lemt 28923 ifchhv 29015 hhssablo 29034 hhssnvt 29036 shscl 29089 shslej 29151 shincl 29152 omlsii 29174 pjoml 29207 pjoc2 29210 chm0 29262 chne0 29265 chocin 29266 chj0 29268 chlejb1 29283 chnle 29285 ledi 29311 h1datom 29353 cmbr3 29379 pjoml2 29382 cmcm 29385 cmcm3 29386 lecm 29388 pjmuli 29460 pjige0 29462 pjhfo 29477 pj11 29485 eigre 29606 eigorth 29609 hoddi 29761 nmlnop0 29769 lnopeq 29780 lnopunilem2 29782 nmbdoplb 29796 nmcopex 29800 nmcoplb 29801 lnopcon 29806 lnfn0 29818 lnfnmul 29819 nmcfnex 29824 nmcfnlb 29825 lnfncon 29827 riesz4 29835 riesz1 29836 cnlnadjeu 29849 pjhmop 29921 pjidmco 29952 mdslmd1lem3 30098 mdslmd1lem4 30099 csmdsymi 30105 hatomic 30131 atord 30159 atcvat2 30160 bnj941 32039 bnj944 32205 kur14 32458 abs2sqle 32918 abs2sqlt 32919 onsucconn 33781 onsucsuccmp 33787 sdclem1 35012 mnurnd 40612 bnd2d 44777 |
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