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Mirrors > Home > MPE Home > Th. List > ssex | Structured version Visualization version GIF version |
Description: The subset of a set is also a set. Exercise 3 of [TakeutiZaring] p. 22. This is one way to express the Axiom of Separation ax-sep 5206 (a.k.a. Subset Axiom). (Contributed by NM, 27-Apr-1994.) |
Ref | Expression |
---|---|
ssex.1 | ⊢ 𝐵 ∈ V |
Ref | Expression |
---|---|
ssex | ⊢ (𝐴 ⊆ 𝐵 → 𝐴 ∈ V) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-ss 3955 | . 2 ⊢ (𝐴 ⊆ 𝐵 ↔ (𝐴 ∩ 𝐵) = 𝐴) | |
2 | ssex.1 | . . . 4 ⊢ 𝐵 ∈ V | |
3 | 2 | inex2 5225 | . . 3 ⊢ (𝐴 ∩ 𝐵) ∈ V |
4 | eleq1 2903 | . . 3 ⊢ ((𝐴 ∩ 𝐵) = 𝐴 → ((𝐴 ∩ 𝐵) ∈ V ↔ 𝐴 ∈ V)) | |
5 | 3, 4 | mpbii 235 | . 2 ⊢ ((𝐴 ∩ 𝐵) = 𝐴 → 𝐴 ∈ V) |
6 | 1, 5 | sylbi 219 | 1 ⊢ (𝐴 ⊆ 𝐵 → 𝐴 ∈ V) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1536 ∈ wcel 2113 Vcvv 3497 ∩ cin 3938 ⊆ wss 3939 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1969 ax-7 2014 ax-8 2115 ax-9 2123 ax-10 2144 ax-11 2160 ax-12 2176 ax-ext 2796 ax-sep 5206 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1539 df-ex 1780 df-nf 1784 df-sb 2069 df-clab 2803 df-cleq 2817 df-clel 2896 df-nfc 2966 df-rab 3150 df-v 3499 df-in 3946 df-ss 3955 |
This theorem is referenced by: ssexi 5229 ssexg 5230 intex 5243 moabex 5354 ixpiunwdom 9058 omex 9109 tcss 9189 bndrank 9273 scottex 9317 aceq3lem 9549 cfslb 9691 dcomex 9872 axdc2lem 9873 grothpw 10251 grothpwex 10252 grothomex 10254 elnp 10412 negfi 11592 hashfacen 13815 limsuple 14838 limsuplt 14839 limsupbnd1 14842 o1add2 14983 o1mul2 14984 o1sub2 14985 o1dif 14989 caucvgrlem 15032 fsumo1 15170 lcmfval 15968 lcmf0val 15969 unbenlem 16247 ressbas2 16558 prdsval 16731 prdsbas 16733 rescbas 17102 reschom 17103 rescco 17105 acsmapd 17791 issstrmgm 17866 issubmnd 17941 eqgfval 18331 dfod2 18694 ablfac1b 19195 islinds2 20960 pmatcollpw3lem 21394 2basgen 21601 prdstopn 22239 ressust 22876 rectbntr0 23443 elcncf 23500 cncfcnvcn 23532 cmssmscld 23956 cmsss 23957 ovolctb2 24096 limcfval 24473 ellimc2 24478 limcflf 24482 limcres 24487 limcun 24496 dvfval 24498 lhop2 24615 taylfval 24950 ulmval 24971 xrlimcnp 25549 axtgcont1 26257 fpwrelmap 30472 ressnm 30642 ressprs 30646 ordtrestNEW 31168 ddeval1 31497 ddeval0 31498 carsgclctunlem3 31582 bnj849 32201 msrval 32789 mclsval 32814 brsset 33354 isfne4 33692 refssfne 33710 topjoin 33717 bj-snglex 34289 mblfinlem3 34935 filbcmb 35019 cnpwstotbnd 35079 ismtyval 35082 ispsubsp 36885 ispsubclN 37077 isnumbasgrplem2 39710 rtrclex 39983 brmptiunrelexpd 40034 iunrelexp0 40053 mulcncff 42157 subcncff 42169 addcncff 42173 cncfuni 42175 divcncff 42180 etransclem1 42527 etransclem4 42530 etransclem13 42539 isvonmbl 42927 issubmgm2 44064 linccl 44476 ellcoellss 44497 elbigolo1 44624 |
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