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Mirrors > Home > MPE Home > Th. List > eleq1a | Structured version Visualization version GIF version |
Description: A transitive-type law relating membership and equality. (Contributed by NM, 9-Apr-1994.) |
Ref | Expression |
---|---|
eleq1a | ⊢ (𝐴 ∈ 𝐵 → (𝐶 = 𝐴 → 𝐶 ∈ 𝐵)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eleq1 2900 | . 2 ⊢ (𝐶 = 𝐴 → (𝐶 ∈ 𝐵 ↔ 𝐴 ∈ 𝐵)) | |
2 | 1 | biimprcd 252 | 1 ⊢ (𝐴 ∈ 𝐵 → (𝐶 = 𝐴 → 𝐶 ∈ 𝐵)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1533 ∈ wcel 2110 |
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-ex 1777 df-cleq 2814 df-clel 2893 |
This theorem is referenced by: elex2 3516 elex22 3517 clel5OLD 3657 disjne 4403 eqoreldif 4621 ordelinel 6288 ssimaex 6747 fnex 6979 f1ocnv2d 7397 peano5 7604 mpoexw 7775 tfrlem8 8019 tz7.48-2 8077 tz7.49 8080 eroprf 8394 onfin 8708 pssnn 8735 ac6sfi 8761 elfiun 8893 brwdom 9030 ficardom 9389 ficard 9986 tskxpss 10193 inar1 10196 rankcf 10198 tskuni 10204 gruun 10227 nsmallnq 10398 prnmadd 10418 genpss 10425 eqlei 10749 eqlei2 10750 renegcli 10946 supaddc 11607 supadd 11608 supmul1 11609 supmullem2 11611 supmul 11612 nn0ind-raph 12081 uzwo 12310 iccid 12782 hashvnfin 13720 hashdifsnp1 13853 mertenslem2 15240 4sqlem1 16283 4sqlem4 16287 4sqlem11 16290 symggen 18597 psgnran 18642 odlem1 18662 gexlem1 18703 gsumpr 19074 lssvneln0 19722 lss1d 19734 lspsn 19773 lsmelval2 19856 psgnghm 20723 opnneiid 21733 cmpsublem 22006 metrest 23133 metustel 23159 dscopn 23182 ovolshftlem2 24110 subopnmbl 24204 deg1ldgn 24686 plyremlem 24892 coseq0negpitopi 25088 ppiublem1 25777 mptelee 26680 nbuhgr2vtx1edgblem 27132 numclwwlk1lem2foa 28132 shsleji 29146 spansnss 29347 spansncvi 29428 f1o3d 30371 sigaclcu2 31379 measdivcstALTV 31484 dfon2lem6 33033 noextendseq 33174 bdayfo 33182 scutf 33273 altxpsspw 33438 hfun 33639 ontgval 33779 ordtoplem 33783 ordcmp 33795 findreccl 33801 bj-xpnzex 34271 bj-snsetex 34275 bj-ismooredr2 34401 bj-ideqg1 34455 topdifinfindis 34626 finxpreclem1 34669 ovoliunnfl 34933 volsupnfl 34936 heibor1lem 35086 heibor1 35087 lshpkrlem1 36245 lfl1dim 36256 leat3 36430 meetat2 36432 glbconxN 36513 pointpsubN 36886 pmapglbx 36904 linepsubclN 37086 dia2dimlem7 38205 dib1dim2 38303 diclspsn 38329 dih1dimatlem 38464 dihatexv2 38474 djhlsmcl 38549 fltne 39270 3cubes 39285 hbtlem2 39722 hbtlem5 39726 rp-isfinite6 39882 snssiALTVD 41159 snssiALT 41160 elex2VD 41170 elex22VD 41171 fveqvfvv 43274 afv0fv0 43347 lswn0 43603 lidlmmgm 44195 1neven 44202 cznrng 44225 |
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