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Mirrors > Home > MPE Home > Th. List > eluni2 | Structured version Visualization version GIF version |
Description: Membership in class union. Restricted quantifier version. (Contributed by NM, 31-Aug-1999.) |
Ref | Expression |
---|---|
eluni2 | ⊢ (𝐴 ∈ ∪ 𝐵 ↔ ∃𝑥 ∈ 𝐵 𝐴 ∈ 𝑥) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | exancom 1869 | . 2 ⊢ (∃𝑥(𝐴 ∈ 𝑥 ∧ 𝑥 ∈ 𝐵) ↔ ∃𝑥(𝑥 ∈ 𝐵 ∧ 𝐴 ∈ 𝑥)) | |
2 | eluni 4808 | . 2 ⊢ (𝐴 ∈ ∪ 𝐵 ↔ ∃𝑥(𝐴 ∈ 𝑥 ∧ 𝑥 ∈ 𝐵)) | |
3 | df-rex 3057 | . 2 ⊢ (∃𝑥 ∈ 𝐵 𝐴 ∈ 𝑥 ↔ ∃𝑥(𝑥 ∈ 𝐵 ∧ 𝐴 ∈ 𝑥)) | |
4 | 1, 2, 3 | 3bitr4i 306 | 1 ⊢ (𝐴 ∈ ∪ 𝐵 ↔ ∃𝑥 ∈ 𝐵 𝐴 ∈ 𝑥) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 209 ∧ wa 399 ∃wex 1787 ∈ wcel 2112 ∃wrex 3052 ∪ cuni 4805 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2018 ax-8 2114 ax-9 2122 ax-ext 2708 |
This theorem depends on definitions: df-bi 210 df-an 400 df-tru 1546 df-ex 1788 df-sb 2073 df-clab 2715 df-cleq 2728 df-clel 2809 df-rex 3057 df-v 3400 df-uni 4806 |
This theorem is referenced by: uni0b 4833 intssuni 4867 iuncom4 4898 inuni 5221 cnvuni 5740 chfnrn 6847 ssorduni 7541 unon 7588 limuni3 7609 frrlem9 8013 onfununi 8056 oarec 8268 uniinqs 8457 fissuni 8959 finsschain 8961 r1sdom 9355 rankuni2b 9434 cflm 9829 coflim 9840 axdc3lem2 10030 fpwwe2lem11 10220 uniwun 10319 tskr1om2 10347 tskuni 10362 axgroth3 10410 inaprc 10415 tskmval 10418 tskmcl 10420 suplem1pr 10631 lbsextlem2 20150 lbsextlem3 20151 isbasis3g 21800 eltg2b 21810 tgcl 21820 ppttop 21858 epttop 21860 neiptoptop 21982 tgcmp 22252 locfincmp 22377 dissnref 22379 comppfsc 22383 1stckgenlem 22404 txuni2 22416 txcmplem1 22492 tgqtop 22563 filuni 22736 alexsubALTlem4 22901 ptcmplem3 22905 ptcmplem4 22906 utoptop 23086 icccmplem1 23673 icccmplem3 23675 cnheibor 23806 bndth 23809 lebnumlem1 23812 bcthlem4 24178 ovolicc2lem5 24372 dyadmbllem 24450 itg2gt0 24612 rexunirn 30513 unipreima 30654 acunirnmpt2 30671 acunirnmpt2f 30672 elrspunidl 31274 ssmxidllem 31309 reff 31457 locfinreflem 31458 cmpcref 31468 ddemeas 31870 dya2iocuni 31916 bnj1379 32477 cvmsss2 32903 cvmseu 32905 untuni 33317 dfon2lem3 33431 dfon2lem7 33435 dfon2lem8 33436 brbigcup 33886 neibastop1 34234 neibastop2lem 34235 fvineqsneq 35269 heicant 35498 mblfinlem1 35500 cover2 35558 heiborlem9 35663 unichnidl 35875 erim2 36475 prtlem16 36569 prter2 36581 prter3 36582 restuni3 42281 disjinfi 42345 cncfuni 43045 intsaluni 43486 salgencntex 43500 |
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