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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 4615 ordelinel 6283 ssimaex 6742 fnex 6974 f1ocnv2d 7392 peano5 7599 mpoexw 7770 tfrlem8 8014 tz7.48-2 8072 tz7.49 8075 eroprf 8389 onfin 8703 pssnn 8730 ac6sfi 8756 elfiun 8888 brwdom 9025 ficardom 9384 ficard 9981 tskxpss 10188 inar1 10191 rankcf 10193 tskuni 10199 gruun 10222 nsmallnq 10393 prnmadd 10413 genpss 10420 eqlei 10744 eqlei2 10745 renegcli 10941 supaddc 11602 supadd 11603 supmul1 11604 supmullem2 11606 supmul 11607 nn0ind-raph 12076 uzwo 12305 iccid 12777 hashvnfin 13715 hashdifsnp1 13848 mertenslem2 15235 4sqlem1 16278 4sqlem4 16282 4sqlem11 16285 symggen 18592 psgnran 18637 odlem1 18657 gexlem1 18698 gsumpr 19069 lssvneln0 19717 lss1d 19729 lspsn 19768 lsmelval2 19851 psgnghm 20718 opnneiid 21728 cmpsublem 22001 metrest 23128 metustel 23154 dscopn 23177 ovolshftlem2 24105 subopnmbl 24199 deg1ldgn 24681 plyremlem 24887 coseq0negpitopi 25083 ppiublem1 25772 mptelee 26675 nbuhgr2vtx1edgblem 27127 numclwwlk1lem2foa 28127 shsleji 29141 spansnss 29342 spansncvi 29423 f1o3d 30366 sigaclcu2 31374 measdivcstALTV 31479 dfon2lem6 33028 noextendseq 33169 bdayfo 33177 scutf 33268 altxpsspw 33433 hfun 33634 ontgval 33774 ordtoplem 33778 ordcmp 33790 findreccl 33796 bj-xpnzex 34266 bj-snsetex 34270 bj-ismooredr2 34396 bj-ideqg1 34450 topdifinfindis 34621 finxpreclem1 34664 ovoliunnfl 34928 volsupnfl 34931 heibor1lem 35081 heibor1 35082 lshpkrlem1 36240 lfl1dim 36251 leat3 36425 meetat2 36427 glbconxN 36508 pointpsubN 36881 pmapglbx 36899 linepsubclN 37081 dia2dimlem7 38200 dib1dim2 38298 diclspsn 38324 dih1dimatlem 38459 dihatexv2 38469 djhlsmcl 38544 fltne 39265 3cubes 39280 hbtlem2 39717 hbtlem5 39721 rp-isfinite6 39877 snssiALTVD 41154 snssiALT 41155 elex2VD 41165 elex22VD 41166 fveqvfvv 43269 afv0fv0 43342 lswn0 43598 lidlmmgm 44190 1neven 44197 cznrng 44220 |
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