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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 4781 (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 3588 | . 2 ⊢ (𝐴 ⊆ 𝐵 ↔ (𝐴 ∩ 𝐵) = 𝐴) | |
2 | ssex.1 | . . . 4 ⊢ 𝐵 ∈ V | |
3 | 2 | inex2 4800 | . . 3 ⊢ (𝐴 ∩ 𝐵) ∈ V |
4 | eleq1 2689 | . . 3 ⊢ ((𝐴 ∩ 𝐵) = 𝐴 → ((𝐴 ∩ 𝐵) ∈ V ↔ 𝐴 ∈ V)) | |
5 | 3, 4 | mpbii 223 | . 2 ⊢ ((𝐴 ∩ 𝐵) = 𝐴 → 𝐴 ∈ V) |
6 | 1, 5 | sylbi 207 | 1 ⊢ (𝐴 ⊆ 𝐵 → 𝐴 ∈ V) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1483 ∈ wcel 1990 Vcvv 3200 ∩ cin 3573 ⊆ 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: ssexi 4803 ssexg 4804 intex 4820 moabex 4927 ixpiunwdom 8496 omex 8540 tcss 8620 bndrank 8704 scottex 8748 aceq3lem 8943 cfslb 9088 dcomex 9269 axdc2lem 9270 grothpw 9648 grothpwex 9649 grothomex 9651 elnp 9809 negfi 10971 hashfacen 13238 limsuple 14209 limsuplt 14210 limsupbnd1 14213 o1add2 14354 o1mul2 14355 o1sub2 14356 o1dif 14360 caucvgrlem 14403 fsumo1 14544 lcmfval 15334 lcmf0val 15335 unbenlem 15612 ressbas2 15931 prdsval 16115 prdsbas 16117 rescbas 16489 reschom 16490 rescco 16492 acsmapd 17178 issstrmgm 17252 issubmnd 17318 eqgfval 17642 dfod2 17981 ablfac1b 18469 islinds2 20152 pmatcollpw3lem 20588 2basgen 20794 prdstopn 21431 ressust 22068 rectbntr0 22635 elcncf 22692 cncfcnvcn 22724 cmsss 23147 ovolctb2 23260 limcfval 23636 ellimc2 23641 limcflf 23645 limcres 23650 limcun 23659 dvfval 23661 lhop2 23778 taylfval 24113 ulmval 24134 xrlimcnp 24695 axtgcont1 25367 fpwrelmap 29508 ressnm 29651 ressprs 29655 ordtrestNEW 29967 ddeval1 30297 ddeval0 30298 carsgclctunlem3 30382 bnj849 30995 msrval 31435 mclsval 31460 brsset 31996 isfne4 32335 refssfne 32353 topjoin 32360 bj-snglex 32961 mblfinlem3 33448 filbcmb 33535 cnpwstotbnd 33596 ismtyval 33599 ispsubsp 35031 ispsubclN 35223 isnumbasgrplem2 37674 rtrclex 37924 brmptiunrelexpd 37975 iunrelexp0 37994 mulcncff 40081 subcncff 40093 addcncff 40097 cncfuni 40099 divcncff 40104 etransclem1 40452 etransclem4 40455 etransclem13 40464 isvonmbl 40852 issubmgm2 41790 linccl 42203 ellcoellss 42224 elbigolo1 42351 |
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