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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 3627 | . . . 4 ⊢ (𝑥 = 𝐵 → (𝐴 ⊆ 𝑥 ↔ 𝐴 ⊆ 𝐵)) | |
2 | 1 | imbi1d 331 | . . 3 ⊢ (𝑥 = 𝐵 → ((𝐴 ⊆ 𝑥 → 𝐴 ∈ V) ↔ (𝐴 ⊆ 𝐵 → 𝐴 ∈ V))) |
3 | vex 3203 | . . . 4 ⊢ 𝑥 ∈ V | |
4 | 3 | ssex 4802 | . . 3 ⊢ (𝐴 ⊆ 𝑥 → 𝐴 ∈ V) |
5 | 2, 4 | vtoclg 3266 | . 2 ⊢ (𝐵 ∈ 𝐶 → (𝐴 ⊆ 𝐵 → 𝐴 ∈ V)) |
6 | 5 | impcom 446 | 1 ⊢ ((𝐴 ⊆ 𝐵 ∧ 𝐵 ∈ 𝐶) → 𝐴 ∈ V) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 384 = wceq 1483 ∈ wcel 1990 Vcvv 3200 ⊆ wss 3574 |
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-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-sep 4781 |
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-v 3202 df-in 3581 df-ss 3588 |
This theorem is referenced by: ssexd 4805 prcssprc 4806 difexg 4808 rabexg 4812 elssabg 4819 elpw2g 4827 abssexg 4851 snexALT 4852 sess1 5082 sess2 5083 riinint 5382 resexg 5442 trsuc 5810 ordsssuc2 5814 mptexg 6484 mptexgf 6485 isofr2 6594 ofres 6913 brrpssg 6939 unexb 6958 xpexg 6960 abnexg 6964 difex2 6969 uniexr 6972 dmexg 7097 rnexg 7098 resiexg 7102 imaexg 7103 exse2 7105 cnvexg 7112 coexg 7117 fabexg 7122 f1oabexg 7125 resfunexgALT 7129 cofunexg 7130 fnexALT 7132 f1dmex 7136 oprabexd 7155 mpt2exxg 7244 suppfnss 7320 tposexg 7366 tz7.48-3 7539 oaabs 7724 erex 7766 mapex 7863 pmvalg 7868 elpmg 7873 elmapssres 7882 pmss12g 7884 ralxpmap 7907 ixpexg 7932 ssdomg 8001 fiprc 8039 domunsncan 8060 infensuc 8138 pssnn 8178 unbnn 8216 fodomfi 8239 fival 8318 fiss 8330 dffi3 8337 hartogslem2 8448 card2on 8459 wdomima2g 8491 unxpwdom2 8493 unxpwdom 8494 harwdom 8495 oemapvali 8581 ackbij1lem11 9052 cofsmo 9091 ssfin4 9132 fin23lem11 9139 ssfin2 9142 ssfin3ds 9152 isfin1-3 9208 hsmex3 9256 axdc2lem 9270 ac6num 9301 ttukeylem1 9331 dmct 9346 ondomon 9385 fpwwe2lem3 9455 fpwwe2lem12 9463 fpwwe2lem13 9464 canthwe 9473 wuncss 9567 genpv 9821 genpdm 9824 hashss 13197 hashf1lem1 13239 wrdexg 13315 wrdexb 13316 shftfval 13810 o1of2 14343 o1rlimmul 14349 isercolllem2 14396 isstruct2 15867 ressval3d 15937 ressabs 15939 prdsbas 16117 fnmrc 16267 mrcfval 16268 isacs1i 16318 mreacs 16319 isssc 16480 ipolerval 17156 ress0g 17319 symgbas 17800 sylow2a 18034 islbs3 19155 toponsspwpw 20726 basdif0 20757 tgval 20759 eltg 20761 eltg2 20762 tgss 20772 basgen2 20793 2basgen 20794 bastop1 20797 topnex 20800 resttopon 20965 restabs 20969 restcld 20976 restfpw 20983 restcls 20985 restntr 20986 ordtbas2 20995 ordtbas 20996 lmfval 21036 cnrest 21089 cmpcov 21192 cmpsublem 21202 cmpsub 21203 2ndcomap 21261 islocfin 21320 txss12 21408 ptrescn 21442 trfbas2 21647 trfbas 21648 isfildlem 21661 snfbas 21670 trfil1 21690 trfil2 21691 trufil 21714 ssufl 21722 hauspwpwf1 21791 ustval 22006 metrest 22329 cnheibor 22754 metcld2 23105 bcthlem1 23121 mbfimaopn2 23424 0pledm 23440 dvbss 23665 dvreslem 23673 dvres2lem 23674 dvcnp2 23683 dvaddbr 23701 dvmulbr 23702 dvcnvrelem2 23781 elply2 23952 plyf 23954 plyss 23955 elplyr 23957 plyeq0lem 23966 plyeq0 23967 plyaddlem 23971 plymullem 23972 dgrlem 23985 coeidlem 23993 ulmcn 24153 pserulm 24176 rabexgfGS 29340 abrexdomjm 29345 aciunf1 29463 ress1r 29789 pcmplfin 29927 metidval 29933 indval 30075 sigagenss 30212 measval 30261 omsfval 30356 omssubaddlem 30361 omssubadd 30362 elcarsg 30367 carsggect 30380 erdsze2lem1 31185 erdsze2lem2 31186 cvxpconn 31224 elmsta 31445 dfon2lem3 31690 altxpexg 32085 ivthALT 32330 filnetlem3 32375 bj-restsnss 33036 bj-restsnss2 33037 bj-restb 33047 bj-restuni2 33051 abrexdom 33525 sdclem2 33538 sdclem1 33539 elrfirn 37258 pwssplit4 37659 hbtlem1 37693 hbtlem7 37695 rabexgf 39183 wessf1ornlem 39371 disjinfi 39380 dvnprodlem1 40161 dvnprodlem2 40162 qndenserrnbllem 40514 sge0ss 40629 psmeasurelem 40687 caragensplit 40714 omeunile 40719 caragenuncl 40727 omeunle 40730 omeiunlempt 40734 carageniuncllem2 40736 mpt2exxg2 42116 gsumlsscl 42164 lincellss 42215 |
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