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| Description: The ZF Axiom of Union in class notation, in the form of a theorem instead of an inference. We use the antecedent A ∈ B instead of A ∈ V to make the theorem more general and thus shorten some proofs; obviously V is one possibility for B. |
| Ref | Expression |
|---|---|
| uniexg | ⊢ (A ∈ B → ∪A ∈ V) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | unieq 2576 | . . 3 ⊢ (x = A → ∪x = ∪A) | |
| 2 | 1 | eleq1d 1583 | . 2 ⊢ (x = A → (∪x ∈ V ↔ ∪A ∈ V)) |
| 3 | visset 1859 | . . 3 ⊢ x ∈ V | |
| 4 | 3 | uniex 3093 | . 2 ⊢ ∪x ∈ V |
| 5 | 2, 4 | vtoclg 1893 | 1 ⊢ (A ∈ B → ∪A ∈ V) |
| Colors of variables: wff set class |
| Syntax hints: → wi 3 = wceq 992 ∈ wcel 994 Vcvv 1857 ∪cuni 2569 |
| This theorem is referenced by: snnex 3100 euuni 3105 uniexb 3130 ssonuni 3148 dmexg 3445 rnexg 3446 iunexg 3976 onopruni 4210 tz7.44lem1 4228 carduni 5008 cardprc 5011 suplem2pr 5316 lbinfm 6216 eltopsp 7816 istps 7818 tgval 7828 eltg 7830 eltg2 7831 cldval 7876 ntrfval 7877 clsfval 7878 iscld 7879 ntrval 7886 clsval 7887 neifval 7924 neif 7925 neiss2 7926 neival 7927 isnei 7928 lpfval 7952 lpval 7953 islp2 7957 cnpfval 7967 iscn 7968 iscnp 7970 grpinvval 8284 grpinvf 8297 spwval2 8915 pjval 9515 fiv 10849 idrval 10904 topindis 11009 homeofval 11022 idhme 11028 hmphre 11036 homcardus 11046 stoiglem 11063 qusp 11068 fillsb 11073 cnfilca 11088 sfvlim 11100 limfillem1 11101 bwt2 11123 opncldf1 11454 cncls 11473 elsubsp 11477 subspid 11478 subsubtop 11479 subcld 11480 subntr 11482 cnsubsp2 11484 compsublem 11487 compsub 11488 cptclsscpt 11489 compfipin0lem 11492 compfipin0 11493 connsub 11502 isfne 11541 isref 11549 locfindsc 11576 topjoin 11588 fnejoin1 11591 fgf 11632 elfg 11633 ufilss 11652 ufileu 11658 filufint 11659 uffixfr 11660 filcon 11665 limfil 11675 flimcls 11684 cnpfillim 11686 filmapf 11688 isfilmap 11689 elfilmap3 11692 fmfnfmlem4 11703 fmfnfm 11704 flimff 11707 sflimf 11708 isflimf 11709 flimfnei 11710 flimfcnp 11714 sfcls 11716 fcluscf 11724 flimfnfcls 11727 fcluscnplem 11729 fcluscnp 11730 fcluscomp 11733 fclusff 11735 sfclusf 11736 isfclusf 11737 flfssfcf 11741 uffcfflf 11742 tailf 11756 istail 11757 tailmap 11759 filnetlem4 11766 filnet 11768 supex2g 11853 subspopn 11900 subspabs 11903 cnimass 11949 cnres 11950 cnresima 11952 cnss 11953 ishomeo2 11957 tlmval 11964 txuni 11975 tx1cn 11976 tx2cn 11977 uptx 11978 txcn 11979 txsubsp 11983 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 998 ax-gen 999 ax-8 1000 ax-10 1002 ax-12 1004 ax-13 1005 ax-14 1006 ax-17 1007 ax-4 1009 ax-5o 1011 ax-6o 1014 ax-9o 1159 ax-10o 1177 ax-16 1247 ax-11o 1255 ax-ext 1500 ax-sep 2777 ax-un 3089 |
| This theorem depends on definitions: df-bi 145 df-or 222 df-an 223 df-ex 1017 df-sb 1209 df-clab 1506 df-cleq 1511 df-clel 1514 df-v 1858 df-uni 2570 |