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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 4224 | . 2 ⊢ (𝐴 ⊆ 𝐵 → 𝐴 ∈ V) |
| 4 | 1, 3 | ax-mp 5 | 1 ⊢ 𝐴 ∈ V |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2200 Vcvv 2800 ⊆ wss 3198 |
| 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 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-ext 2211 ax-sep 4205 |
| This theorem depends on definitions: df-bi 117 df-tru 1398 df-nf 1507 df-sb 1809 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-v 2802 df-in 3204 df-ss 3211 |
| This theorem is referenced by: zfausab 4230 pp0ex 4277 ord3ex 4278 epse 4437 opabex 5873 mptexw 6270 oprabex 6285 mpoexw 6373 phplem2 7034 phpm 7047 snexxph 7140 sbthlem2 7148 2omotaplemst 7467 niex 7522 enqex 7570 enq0ex 7649 npex 7683 ltnqex 7759 gtnqex 7760 recexprlemell 7832 recexprlemelu 7833 enrex 7947 axcnex 8069 peano5nnnn 8102 reex 8156 nnex 9139 zex 9478 qex 9856 ixxex 10124 iccen 10231 serclim0 11856 climle 11885 iserabs 12026 isumshft 12041 explecnv 12056 prodfclim1 12095 prmex 12675 exmidunben 13037 prdsex 13342 prdsval 13346 fngsum 13461 igsumvalx 13462 metuex 14559 cnfldstr 14562 cnfldle 14571 znval 14640 znle 14641 znbaslemnn 14643 istopon 14727 dmtopon 14737 lmres 14962 climcncf 15298 reldvg 15393 |
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