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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 1857 | . 2 ⊢ (∃𝑥(𝐴 ∈ 𝑥 ∧ 𝑥 ∈ 𝐵) ↔ ∃𝑥(𝑥 ∈ 𝐵 ∧ 𝐴 ∈ 𝑥)) | |
2 | eluni 4834 | . 2 ⊢ (𝐴 ∈ ∪ 𝐵 ↔ ∃𝑥(𝐴 ∈ 𝑥 ∧ 𝑥 ∈ 𝐵)) | |
3 | df-rex 3144 | . 2 ⊢ (∃𝑥 ∈ 𝐵 𝐴 ∈ 𝑥 ↔ ∃𝑥(𝑥 ∈ 𝐵 ∧ 𝐴 ∈ 𝑥)) | |
4 | 1, 2, 3 | 3bitr4i 305 | 1 ⊢ (𝐴 ∈ ∪ 𝐵 ↔ ∃𝑥 ∈ 𝐵 𝐴 ∈ 𝑥) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 208 ∧ wa 398 ∃wex 1776 ∈ wcel 2110 ∃wrex 3139 ∪ cuni 4831 |
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-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-rex 3144 df-v 3496 df-uni 4832 |
This theorem is referenced by: uni0b 4856 intssuni 4890 iuncom4 4919 inuni 5238 cnvuni 5751 chfnrn 6813 ssorduni 7494 unon 7540 limuni3 7561 onfununi 7972 oarec 8182 uniinqs 8371 fissuni 8823 finsschain 8825 r1sdom 9197 rankuni2b 9276 cflm 9666 coflim 9677 axdc3lem2 9867 fpwwe2lem12 10057 uniwun 10156 tskr1om2 10184 tskuni 10199 axgroth3 10247 inaprc 10252 tskmval 10255 tskmcl 10257 suplem1pr 10468 lbsextlem2 19925 lbsextlem3 19926 isbasis3g 21551 eltg2b 21561 tgcl 21571 ppttop 21609 epttop 21611 neiptoptop 21733 tgcmp 22003 locfincmp 22128 dissnref 22130 comppfsc 22134 1stckgenlem 22155 txuni2 22167 txcmplem1 22243 tgqtop 22314 filuni 22487 alexsubALTlem4 22652 ptcmplem3 22656 ptcmplem4 22657 utoptop 22837 icccmplem1 23424 icccmplem3 23426 cnheibor 23553 bndth 23556 lebnumlem1 23559 bcthlem4 23924 ovolicc2lem5 24116 dyadmbllem 24194 itg2gt0 24355 rexunirn 30250 unipreima 30385 acunirnmpt2 30399 acunirnmpt2f 30400 ssmxidllem 30973 reff 31098 locfinreflem 31099 cmpcref 31109 ddemeas 31490 dya2iocuni 31536 bnj1379 32097 cvmsss2 32516 cvmseu 32518 untuni 32930 dfon2lem3 33025 dfon2lem7 33029 dfon2lem8 33030 frrlem9 33126 brbigcup 33354 neibastop1 33702 neibastop2lem 33703 fvineqsneq 34687 heicant 34921 mblfinlem1 34923 cover2 34983 heiborlem9 35091 unichnidl 35303 erim2 35905 prtlem16 35999 prter2 36011 prter3 36012 restuni3 41377 disjinfi 41447 cncfuni 42162 intsaluni 42606 salgencntex 42620 |
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