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 3212 | . 2 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ V) | |
2 | elex 3212 | . 2 ⊢ (𝐵 ∈ 𝑊 → 𝐵 ∈ V) | |
3 | unexb 6958 | . . 3 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) ↔ (𝐴 ∪ 𝐵) ∈ V) | |
4 | 3 | biimpi 206 | . 2 ⊢ ((𝐴 ∈ V ∧ 𝐵 ∈ V) → (𝐴 ∪ 𝐵) ∈ V) |
5 | 1, 2, 4 | syl2an 494 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → (𝐴 ∪ 𝐵) ∈ V) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 384 ∈ wcel 1990 Vcvv 3200 ∪ cun 3572 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-8 1992 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-sep 4781 ax-nul 4789 ax-pr 4906 ax-un 6949 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-rex 2918 df-v 3202 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-nul 3916 df-sn 4178 df-pr 4180 df-uni 4437 |
This theorem is referenced by: xpexg 6960 difex2 6969 difsnexi 6970 eldifpw 6976 ordunpr 7026 soex 7109 fnse 7294 suppun 7315 tposexg 7366 wfrlem15 7429 tfrlem12 7485 tfrlem16 7489 ralxpmap 7907 undifixp 7944 undom 8048 domunsncan 8060 domssex2 8120 domssex 8121 mapunen 8129 fsuppunbi 8296 elfiun 8336 brwdom2 8478 unwdomg 8489 alephprc 8922 cdadom3 9010 infunabs 9029 fin23lem11 9139 axdc2lem 9270 ttukeylem1 9331 fpwwe2lem13 9464 wunex2 9560 wuncval2 9569 hashunx 13175 hashf1lem1 13239 trclexlem 13733 trclun 13755 relexp0g 13762 relexpsucnnr 13765 isstruct2 15867 setsvalg 15887 setsid 15914 yonffth 16924 dmdprdsplit2 18445 basdif0 20757 fiuncmp 21207 refun0 21318 ptbasfi 21384 dfac14lem 21420 ptrescn 21442 xkoptsub 21457 filconn 21687 isufil2 21712 ufileu 21723 filufint 21724 fmfnfmlem4 21761 fmfnfm 21762 fclsfnflim 21831 flimfnfcls 21832 ptcmplem1 21856 elply2 23952 plyss 23955 wlkp1lem4 26573 resf1o 29505 locfinref 29908 esumsplit 30115 esumpad2 30118 sseqval 30450 bnj1149 30863 ssltun1 31915 ssltun2 31916 altxpexg 32085 hfun 32285 refssfne 32353 topjoin 32360 bj-2uplex 33010 ptrest 33408 poimirlem3 33412 paddval 35084 elrfi 37257 elmapresaun 37334 rclexi 37922 rtrclexlem 37923 trclubgNEW 37925 clcnvlem 37930 cnvrcl0 37932 dfrtrcl5 37936 iunrelexp0 37994 relexpmulg 38002 relexp01min 38005 relexpxpmin 38009 brtrclfv2 38019 sge0resplit 40623 sge0split 40626 setsv 41348 setrec1lem4 42437 |
Copyright terms: Public domain | W3C validator |