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| Mirrors > Home > ILE Home > Th. List > ssexi | GIF version | ||
| Description: The subset of a set is also a set. (Contributed by NM, 9-Sep-1993.) |
| Ref | Expression |
|---|---|
| ssexi.1 | ⊢ 𝐵 ∈ V |
| ssexi.2 | ⊢ 𝐴 ⊆ 𝐵 |
| Ref | Expression |
|---|---|
| ssexi | ⊢ 𝐴 ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ssexi.2 | . 2 ⊢ 𝐴 ⊆ 𝐵 | |
| 2 | ssexi.1 | . . 3 ⊢ 𝐵 ∈ V | |
| 3 | 2 | ssex 4226 | . 2 ⊢ (𝐴 ⊆ 𝐵 → 𝐴 ∈ V) |
| 4 | 1, 3 | ax-mp 5 | 1 ⊢ 𝐴 ∈ V |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2202 Vcvv 2802 ⊆ wss 3200 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-ext 2213 ax-sep 4207 |
| This theorem depends on definitions: df-bi 117 df-tru 1400 df-nf 1509 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-v 2804 df-in 3206 df-ss 3213 |
| This theorem is referenced by: zfausab 4232 pp0ex 4279 ord3ex 4280 epse 4439 opabex 5878 mptexw 6275 oprabex 6290 mpoexw 6378 phplem2 7039 phpm 7052 snexxph 7149 sbthlem2 7157 2omotaplemst 7477 niex 7532 enqex 7580 enq0ex 7659 npex 7693 ltnqex 7769 gtnqex 7770 recexprlemell 7842 recexprlemelu 7843 enrex 7957 axcnex 8079 peano5nnnn 8112 reex 8166 nnex 9149 zex 9488 qex 9866 ixxex 10134 iccen 10241 serclim0 11883 climle 11912 iserabs 12054 isumshft 12069 explecnv 12084 prodfclim1 12123 prmex 12703 exmidunben 13065 prdsex 13370 prdsval 13374 fngsum 13489 igsumvalx 13490 metuex 14588 cnfldstr 14591 cnfldle 14600 znval 14669 znle 14670 znbaslemnn 14672 istopon 14756 dmtopon 14766 lmres 14991 climcncf 15327 reldvg 15422 |
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