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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 4709 (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 3554 | . 2 ⊢ (𝐴 ⊆ 𝐵 ↔ (𝐴 ∩ 𝐵) = 𝐴) | |
2 | ssex.1 | . . . 4 ⊢ 𝐵 ∈ V | |
3 | 2 | inex2 4728 | . . 3 ⊢ (𝐴 ∩ 𝐵) ∈ V |
4 | eleq1 2676 | . . 3 ⊢ ((𝐴 ∩ 𝐵) = 𝐴 → ((𝐴 ∩ 𝐵) ∈ V ↔ 𝐴 ∈ V)) | |
5 | 3, 4 | mpbii 222 | . 2 ⊢ ((𝐴 ∩ 𝐵) = 𝐴 → 𝐴 ∈ V) |
6 | 1, 5 | sylbi 206 | 1 ⊢ (𝐴 ⊆ 𝐵 → 𝐴 ∈ V) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1475 ∈ wcel 1977 Vcvv 3173 ∩ cin 3539 ⊆ 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: ssexi 4731 ssexg 4732 intex 4747 moabex 4854 ixpiunwdom 8379 omex 8423 tcss 8503 bndrank 8587 scottex 8631 aceq3lem 8826 cfslb 8971 dcomex 9152 axdc2lem 9153 grothpw 9527 grothpwex 9528 grothomex 9530 elnp 9688 negfi 10850 hashfacen 13095 limsuple 14057 limsuplt 14058 limsupbnd1 14061 o1add2 14202 o1mul2 14203 o1sub2 14204 o1dif 14208 caucvgrlem 14251 fsumo1 14385 lcmfval 15172 lcmf0val 15173 unbenlem 15450 ressbas2 15758 prdsval 15938 prdsbas 15940 rescbas 16312 reschom 16313 rescco 16315 acsmapd 17001 issstrmgm 17075 issubmnd 17141 eqgfval 17465 dfod2 17804 ablfac1b 18292 islinds2 19971 pmatcollpw3lem 20407 2basgen 20605 prdstopn 21241 ressust 21878 rectbntr0 22443 elcncf 22500 cncfcnvcn 22532 cmsss 22955 ovolctb2 23067 limcfval 23442 ellimc2 23447 limcflf 23451 limcres 23456 limcun 23465 dvfval 23467 lhop2 23582 taylfval 23917 ulmval 23938 xrlimcnp 24495 axtgcont1 25167 fpwrelmap 28896 ressnm 28982 ressprs 28986 ordtrestNEW 29295 ddeval1 29624 ddeval0 29625 carsgclctunlem3 29709 bnj849 30249 msrval 30689 mclsval 30714 brsset 31166 isfne4 31505 refssfne 31523 topjoin 31530 bj-snglex 32154 mblfinlem3 32618 filbcmb 32705 cnpwstotbnd 32766 ismtyval 32769 ispsubsp 34049 ispsubclN 34241 isnumbasgrplem2 36693 rtrclex 36943 brmptiunrelexpd 36994 iunrelexp0 37013 mulcncff 38753 subcncff 38765 addcncff 38770 cncfuni 38772 divcncff 38777 etransclem1 39128 etransclem4 39131 etransclem13 39140 isvonmbl 39528 issubmgm2 41580 linccl 41997 ellcoellss 42018 elbigolo1 42149 |
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