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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 3512 | . 2 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ V) | |
2 | elex 3512 | . 2 ⊢ (𝐵 ∈ 𝑊 → 𝐵 ∈ V) | |
3 | unexb 7471 | . . 3 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) ↔ (𝐴 ∪ 𝐵) ∈ V) | |
4 | 3 | biimpi 218 | . 2 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → (𝐴 ∪ 𝐵) ∈ V) |
5 | 1, 2, 4 | syl2an 597 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ∪ 𝐵) ∈ V) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 398 ∈ wcel 2114 Vcvv 3494 ∪ cun 3934 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-sep 5203 ax-nul 5210 ax-pr 5330 ax-un 7461 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-rab 3147 df-v 3496 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-nul 4292 df-sn 4568 df-pr 4570 df-uni 4839 |
This theorem is referenced by: xpexg 7473 difex2 7482 difsnexi 7483 eldifpw 7490 pwuncl 7492 ordunpr 7541 soex 7626 fnse 7827 suppun 7850 tposexg 7906 wfrlem15 7969 tfrlem12 8025 tfrlem16 8029 elmapresaun 8444 ralxpmap 8460 undifixp 8498 undom 8605 domunsncan 8617 domssex2 8677 domssex 8678 mapunen 8686 fsuppunbi 8854 elfiun 8894 brwdom2 9037 unwdomg 9048 djuex 9337 djuexALT 9351 alephprc 9525 djudoml 9610 infunabs 9629 fin23lem11 9739 axdc2lem 9870 ttukeylem1 9931 fpwwe2lem13 10064 wunex2 10160 wuncval2 10169 hashunx 13748 hashf1lem1 13814 trclexlem 14354 trclun 14374 relexp0g 14381 relexpsucnnr 14384 isstruct2 16493 setsvalg 16512 setsid 16538 yonffth 17534 pwmndgplus 18100 dmdprdsplit2 19168 basdif0 21561 fiuncmp 22012 refun0 22123 ptbasfi 22189 dfac14lem 22225 ptrescn 22247 xkoptsub 22262 filconn 22491 isufil2 22516 ufileu 22527 filufint 22528 fmfnfmlem4 22565 fmfnfm 22566 fclsfnflim 22635 flimfnfcls 22636 ptcmplem1 22660 elply2 24786 plyss 24789 wlkp1lem4 27458 resf1o 30466 tocycfv 30751 tocycf 30759 locfinref 31105 esumsplit 31312 esumpad2 31315 sseqval 31646 bnj1149 32064 satfvsuc 32608 satf0suclem 32622 sat1el2xp 32626 fmlasuc0 32631 frrlem13 33135 ssltun1 33269 ssltun2 33270 altxpexg 33439 hfun 33639 refssfne 33706 topjoin 33713 bj-2uplex 34337 ptrest 34906 poimirlem3 34910 paddval 36949 elrfi 39311 rclexi 39995 rtrclexlem 39996 trclubgNEW 39998 clcnvlem 40003 cnvrcl0 40005 dfrtrcl5 40009 iunrelexp0 40067 relexpmulg 40075 relexp01min 40078 relexpxpmin 40082 brtrclfv2 40092 sge0resplit 42708 sge0split 42711 setsv 43558 setrec1lem4 44813 |
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