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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 2877 | . 2 ⊢ (𝐶 = 𝐴 → (𝐶 ∈ 𝐵 ↔ 𝐴 ∈ 𝐵)) | |
2 | 1 | biimprcd 253 | 1 ⊢ (𝐴 ∈ 𝐵 → (𝐶 = 𝐴 → 𝐶 ∈ 𝐵)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1538 ∈ wcel 2111 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2113 ax-9 2121 ax-ext 2770 |
This theorem depends on definitions: df-bi 210 df-an 400 df-ex 1782 df-cleq 2791 df-clel 2870 |
This theorem is referenced by: elex2 3463 elex22 3464 disj 4355 disjne 4362 elpr2g 4549 eqoreldif 4582 ordelinel 6257 ssimaex 6723 fnex 6957 f1ocnv2d 7378 peano5 7585 mpoexw 7759 tfrlem8 8003 tz7.48-2 8061 tz7.49 8064 eroprf 8378 onfin 8694 pssnn 8720 ac6sfi 8746 elfiun 8878 brwdom 9015 ficardom 9374 ficard 9976 tskxpss 10183 inar1 10186 rankcf 10188 tskuni 10194 gruun 10217 nsmallnq 10388 prnmadd 10408 genpss 10415 eqlei 10739 eqlei2 10740 renegcli 10936 supaddc 11595 supadd 11596 supmul1 11597 supmullem2 11599 supmul 11600 nn0ind-raph 12070 uzwo 12299 iccid 12771 hashvnfin 13717 hashdifsnp1 13850 mertenslem2 15233 4sqlem1 16274 4sqlem4 16278 4sqlem11 16281 symggen 18590 psgnran 18635 odlem1 18655 gexlem1 18696 gsumpr 19068 lssvneln0 19716 lss1d 19728 lspsn 19767 lsmelval2 19850 psgnghm 20269 opnneiid 21731 cmpsublem 22004 metrest 23131 metustel 23157 dscopn 23180 ovolshftlem2 24114 subopnmbl 24208 deg1ldgn 24694 plyremlem 24900 coseq0negpitopi 25096 ppiublem1 25786 mptelee 26689 nbuhgr2vtx1edgblem 27141 numclwwlk1lem2foa 28139 shsleji 29153 spansnss 29354 spansncvi 29435 f1o3d 30386 sigaclcu2 31489 measdivcstALTV 31594 dfon2lem6 33146 noextendseq 33287 bdayfo 33295 scutf 33386 altxpsspw 33551 hfun 33752 ontgval 33892 ordtoplem 33896 ordcmp 33908 findreccl 33914 bj-xpnzex 34395 bj-snsetex 34399 bj-ismooredr2 34525 bj-ideqg1 34579 topdifinfindis 34763 finxpreclem1 34806 ovoliunnfl 35099 volsupnfl 35102 heibor1lem 35247 heibor1 35248 lshpkrlem1 36406 lfl1dim 36417 leat3 36591 meetat2 36593 glbconxN 36674 pointpsubN 37047 pmapglbx 37065 linepsubclN 37247 dia2dimlem7 38366 dib1dim2 38464 diclspsn 38490 dih1dimatlem 38625 dihatexv2 38635 djhlsmcl 38710 fsuppssind 39459 fltne 39616 3cubes 39631 hbtlem2 40068 hbtlem5 40072 rp-isfinite6 40226 snssiALTVD 41533 snssiALT 41534 elex2VD 41544 elex22VD 41545 fveqvfvv 43632 afv0fv0 43705 lswn0 43961 lidlmmgm 44549 1neven 44556 cznrng 44579 |
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