Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
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 5205 (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 3954 | . 2 ⊢ (𝐴 ⊆ 𝐵 ↔ (𝐴 ∩ 𝐵) = 𝐴) | |
2 | ssex.1 | . . . 4 ⊢ 𝐵 ∈ V | |
3 | 2 | inex2 5224 | . . 3 ⊢ (𝐴 ∩ 𝐵) ∈ V |
4 | eleq1 2902 | . . 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 1537 ∈ wcel 2114 Vcvv 3496 ∩ cin 3937 ⊆ wss 3938 |
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 2795 ax-sep 5205 |
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 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-rab 3149 df-v 3498 df-in 3945 df-ss 3954 |
This theorem is referenced by: ssexi 5228 ssexg 5229 intex 5242 moabex 5353 ixpiunwdom 9057 omex 9108 tcss 9188 bndrank 9272 scottex 9316 aceq3lem 9548 cfslb 9690 dcomex 9871 axdc2lem 9872 grothpw 10250 grothpwex 10251 grothomex 10253 elnp 10411 negfi 11591 hashfacen 13815 limsuple 14837 limsuplt 14838 limsupbnd1 14841 o1add2 14982 o1mul2 14983 o1sub2 14984 o1dif 14988 caucvgrlem 15031 fsumo1 15169 lcmfval 15967 lcmf0val 15968 unbenlem 16246 ressbas2 16557 prdsval 16730 prdsbas 16732 rescbas 17101 reschom 17102 rescco 17104 acsmapd 17790 issstrmgm 17865 issubmnd 17940 eqgfval 18330 dfod2 18693 ablfac1b 19194 islinds2 20959 pmatcollpw3lem 21393 2basgen 21600 prdstopn 22238 ressust 22875 rectbntr0 23442 elcncf 23499 cncfcnvcn 23531 cmssmscld 23955 cmsss 23956 ovolctb2 24095 limcfval 24472 ellimc2 24477 limcflf 24481 limcres 24486 limcun 24495 dvfval 24497 lhop2 24614 taylfval 24949 ulmval 24970 xrlimcnp 25548 axtgcont1 26256 fpwrelmap 30471 ressnm 30640 ressprs 30644 ordtrestNEW 31166 ddeval1 31495 ddeval0 31496 carsgclctunlem3 31580 bnj849 32199 msrval 32787 mclsval 32812 brsset 33352 isfne4 33690 refssfne 33708 topjoin 33715 bj-snglex 34287 mblfinlem3 34933 filbcmb 35017 cnpwstotbnd 35077 ismtyval 35080 ispsubsp 36883 ispsubclN 37075 isnumbasgrplem2 39711 rtrclex 39984 brmptiunrelexpd 40035 iunrelexp0 40054 mulcncff 42158 subcncff 42170 addcncff 42174 cncfuni 42176 divcncff 42181 etransclem1 42527 etransclem4 42530 etransclem13 42539 isvonmbl 42927 issubmgm2 44064 linccl 44476 ellcoellss 44497 elbigolo1 44624 |
Copyright terms: Public domain | W3C validator |