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Mirrors > Home > MPE Home > Th. List > ssexg | Structured version Visualization version GIF version |
Description: The subset of a set is also a set. Exercise 3 of [TakeutiZaring] p. 22 (generalized). (Contributed by NM, 14-Aug-1994.) |
Ref | Expression |
---|---|
ssexg | ⊢ ((𝐴 ⊆ 𝐵 ∧ 𝐵 ∈ 𝐶) → 𝐴 ∈ V) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sseq2 3590 | . . . 4 ⊢ (𝑥 = 𝐵 → (𝐴 ⊆ 𝑥 ↔ 𝐴 ⊆ 𝐵)) | |
2 | 1 | imbi1d 330 | . . 3 ⊢ (𝑥 = 𝐵 → ((𝐴 ⊆ 𝑥 → 𝐴 ∈ V) ↔ (𝐴 ⊆ 𝐵 → 𝐴 ∈ V))) |
3 | vex 3176 | . . . 4 ⊢ 𝑥 ∈ V | |
4 | 3 | ssex 4730 | . . 3 ⊢ (𝐴 ⊆ 𝑥 → 𝐴 ∈ V) |
5 | 2, 4 | vtoclg 3239 | . 2 ⊢ (𝐵 ∈ 𝐶 → (𝐴 ⊆ 𝐵 → 𝐴 ∈ V)) |
6 | 5 | impcom 445 | 1 ⊢ ((𝐴 ⊆ 𝐵 ∧ 𝐵 ∈ 𝐶) → 𝐴 ∈ V) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 383 = wceq 1475 ∈ wcel 1977 Vcvv 3173 ⊆ wss 3540 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-sep 4709 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-v 3175 df-in 3547 df-ss 3554 |
This theorem is referenced by: ssexd 4733 difexg 4735 rabexg 4739 elssabg 4746 elpw2g 4754 abssexg 4777 snexALT 4778 sess1 5006 sess2 5007 riinint 5303 resexg 5362 trsuc 5727 ordsssuc2 5731 mptexg 6389 isofr2 6494 ofres 6811 brrpssg 6837 unexb 6856 xpexg 6858 difex2 6863 uniexb 6866 dmexg 6989 rnexg 6990 resiexg 6994 imaexg 6995 exse2 6998 cnvexg 7005 coexg 7010 fabexg 7015 f1oabexg 7018 resfunexgALT 7022 cofunexg 7023 fnexALT 7025 f1dmex 7029 oprabexd 7046 mpt2exxg 7133 suppfnss 7207 tposexg 7253 tz7.48-3 7426 oaabs 7611 erex 7653 mapex 7750 pmvalg 7755 elpmg 7759 elmapssres 7768 pmss12g 7770 ralxpmap 7793 ixpexg 7818 ssdomg 7887 fiprc 7924 domunsncan 7945 infensuc 8023 pssnn 8063 unbnn 8101 fodomfi 8124 fival 8201 fiss 8213 dffi3 8220 hartogslem2 8331 card2on 8342 wdomima2g 8374 unxpwdom2 8376 unxpwdom 8377 harwdom 8378 oemapvali 8464 ackbij1lem11 8935 cofsmo 8974 ssfin4 9015 fin23lem11 9022 ssfin2 9025 ssfin3ds 9035 isfin1-3 9091 hsmex3 9139 axdc2lem 9153 ac6num 9184 ttukeylem1 9214 ondomon 9264 fpwwe2lem3 9334 fpwwe2lem12 9342 fpwwe2lem13 9343 canthwe 9352 wuncss 9446 genpv 9700 genpdm 9703 hashss 13058 hashf1lem1 13096 wrdexg 13170 wrdexb 13171 shftfval 13658 o1of2 14191 o1rlimmul 14197 isercolllem2 14244 isstruct2 15704 ressval3d 15764 ressabs 15766 prdsbas 15940 fnmrc 16090 mrcfval 16091 isacs1i 16141 mreacs 16142 isssc 16303 ipolerval 16979 ress0g 17142 symgbas 17623 sylow2a 17857 islbs3 18976 basdif0 20568 tgval 20570 eltg 20572 eltg2 20573 tgss 20583 basgen2 20604 2basgen 20605 bastop1 20608 resttopon 20775 restabs 20779 restcld 20786 restfpw 20793 restcls 20795 restntr 20796 ordtbas2 20805 ordtbas 20806 lmfval 20846 cnrest 20899 cmpcov 21002 cmpsublem 21012 cmpsub 21013 2ndcomap 21071 islocfin 21130 txss12 21218 ptrescn 21252 trfbas2 21457 trfbas 21458 isfildlem 21471 snfbas 21480 trfil1 21500 trfil2 21501 trufil 21524 ssufl 21532 hauspwpwf1 21601 ustval 21816 metrest 22139 cnheibor 22562 metcld2 22913 bcthlem1 22929 mbfimaopn2 23230 0pledm 23246 dvbss 23471 dvreslem 23479 dvres2lem 23480 dvcnp2 23489 dvaddbr 23507 dvmulbr 23508 dvcnvrelem2 23585 elply2 23756 plyf 23758 plyss 23759 elplyr 23761 plyeq0lem 23770 plyeq0 23771 plyaddlem 23775 plymullem 23776 dgrlem 23789 coeidlem 23797 ulmcn 23957 pserulm 23980 iseupa 26492 rabexgfGS 28725 abrexdomjm 28729 mptexgf 28809 aciunf1 28845 dmct 28877 ress1r 29120 pcmplfin 29255 metidval 29261 indval 29403 sigagenss 29539 measval 29588 omsfval 29683 omssubaddlem 29688 omssubadd 29689 elcarsg 29694 carsggect 29707 erdsze2lem1 30439 erdsze2lem2 30440 cvxpcon 30478 elmsta 30699 dfon2lem3 30934 altxpexg 31255 ivthALT 31500 filnetlem3 31545 bj-restsnss 32217 bj-restsnss2 32218 bj-restb 32228 bj-restuni2 32232 bj-toponss 32241 bj-topnex 32247 abrexdom 32695 sdclem2 32708 sdclem1 32709 elrfirn 36276 pwssplit4 36677 hbtlem1 36712 hbtlem7 36714 rabexgf 38206 wessf1ornlem 38366 disjinfi 38375 dvnprodlem1 38836 dvnprodlem2 38837 qndenserrnbllem 39190 sge0ss 39305 psmeasurelem 39363 caragensplit 39390 omeunile 39395 caragenuncl 39403 omeunle 39406 omeiunlempt 39410 carageniuncllem2 39412 prcssprc 40306 mpt2exxg2 41909 gsumlsscl 41958 lincellss 42009 |
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