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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 4272 | . 2 ⊢ (𝐴 ⊆ 𝐵 → 𝐴 ∈ V) |
| 4 | 1, 3 | ax-mp 5 | 1 ⊢ 𝐴 ∈ V |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: ∈ wcel 2209 Vcvv 2821 ⊆ wss 3220 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 ax-sep 4251 |
| This proof depends on definitions: df-bi 117 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-v 2823 df-in 3226 df-ss 3233 |
| This theorem is used by: pp0ex 4328 ord3ex 4329 epse 4489 opabex 5944 mptexw 6346 oprabex 6365 mpoexw 6453 phplem2 7158 phpm 7171 snexxph 7272 sbthlem2 7280 2omotaplemst 7630 niex 7685 enqex 7733 enq0ex 7812 npex 7846 ltnqex 7922 gtnqex 7923 recexprlemell 7995 recexprlemelu 7996 enrex 8110 axcnex 8232 peano5nnnn 8265 reex 8319 nnex 9319 zex 9664 qex 10048 ixxex 10318 iccen 10426 serclim0 12096 climle 12125 iserabs 12267 isumshft 12282 explecnv 12297 prodfclim1 12336 prmex 12916 exmidunben 13375 fngzsum 13767 gzsumvalx 13768 prdsex 14279 prdsval 14280 metuex 15001 cnfldstr 15004 cnfldle 15013 znval 15080 znle 15081 znbaslemnn 15083 istopon 15239 dmtopon 15249 lmres 15474 climcncf 15810 reldvg 15905 pellexlem3 16231 |
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