Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > MPE Home > Th. List > unexg | Structured version Visualization version GIF version |
Description: A union of two sets is a set. Corollary 5.8 of [TakeutiZaring] p. 16. (Contributed by NM, 18-Sep-2006.) |
Ref | Expression |
---|---|
unexg | ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ∪ 𝐵) ∈ V) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elex 3416 | . 2 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ V) | |
2 | elex 3416 | . 2 ⊢ (𝐵 ∈ 𝑊 → 𝐵 ∈ V) | |
3 | unexb 7511 | . . 3 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) ↔ (𝐴 ∪ 𝐵) ∈ V) | |
4 | 3 | biimpi 219 | . 2 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → (𝐴 ∪ 𝐵) ∈ V) |
5 | 1, 2, 4 | syl2an 599 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ∪ 𝐵) ∈ V) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 399 ∈ wcel 2112 Vcvv 3398 ∪ cun 3851 |
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 ax-sep 5177 ax-nul 5184 ax-pr 5307 ax-un 7501 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-tru 1546 df-fal 1556 df-ex 1788 df-sb 2073 df-clab 2715 df-cleq 2728 df-clel 2809 df-rab 3060 df-v 3400 df-dif 3856 df-un 3858 df-in 3860 df-ss 3870 df-nul 4224 df-sn 4528 df-pr 4530 df-uni 4806 |
This theorem is referenced by: xpexg 7513 unexd 7517 difex2 7523 difsnexi 7524 eldifpw 7531 pwuncl 7533 ordunpr 7583 soex 7677 fnse 7878 suppun 7904 tposexg 7960 frrlem13 8017 wfrlem15 8047 tfrlem12 8103 tfrlem16 8107 elmapresaun 8539 ralxpmap 8555 undifixp 8593 undom 8711 domunsncan 8723 domssex2 8784 domssex 8785 mapunen 8793 fsuppunbi 8984 elfiun 9024 brwdom2 9167 unwdomg 9178 djuex 9489 djuexALT 9503 alephprc 9678 djudoml 9763 infunabs 9786 fin23lem11 9896 axdc2lem 10027 ttukeylem1 10088 fpwwe2lem12 10221 wunex2 10317 wuncval2 10326 hashunx 13918 hashf1lem1 13985 hashf1lem1OLD 13986 trclexlem 14522 trclun 14542 relexp0g 14550 relexpsucnnr 14553 isstruct2 16676 setsvalg 16694 setsid 16719 yonffth 17746 pwmndgplus 18316 dmdprdsplit2 19387 basdif0 21804 fiuncmp 22255 refun0 22366 ptbasfi 22432 dfac14lem 22468 ptrescn 22490 xkoptsub 22505 filconn 22734 isufil2 22759 ufileu 22770 filufint 22771 fmfnfmlem4 22808 fmfnfm 22809 fclsfnflim 22878 flimfnfcls 22879 ptcmplem1 22903 elply2 25044 plyss 25047 wlkp1lem4 27718 resf1o 30739 tocycfv 31049 tocycf 31057 locfinref 31459 esumsplit 31687 esumpad2 31690 sseqval 32021 bnj1149 32439 satfvsuc 32990 satf0suclem 33004 sat1el2xp 33008 fmlasuc0 33013 noeta2 33665 etasslt2 33694 scutbdaybnd2lim 33697 altxpexg 33966 hfun 34166 refssfne 34233 topjoin 34240 bj-2uplex 34898 ptrest 35462 poimirlem3 35466 paddval 37498 elrfi 40160 rclexi 40840 rtrclexlem 40841 trclubgNEW 40843 clcnvlem 40848 cnvrcl0 40850 dfrtrcl5 40854 iunrelexp0 40928 relexpmulg 40936 relexp01min 40939 relexpxpmin 40943 brtrclfv2 40953 sge0resplit 43562 sge0split 43565 setsv 44446 setrec1lem4 46010 |
Copyright terms: Public domain | W3C validator |