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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 5877 mptexw 6274 oprabex 6289 mpoexw 6377 phplem2 7038 phpm 7051 snexxph 7148 sbthlem2 7156 2omotaplemst 7476 niex 7531 enqex 7579 enq0ex 7658 npex 7692 ltnqex 7768 gtnqex 7769 recexprlemell 7841 recexprlemelu 7842 enrex 7956 axcnex 8078 peano5nnnn 8111 reex 8165 nnex 9148 zex 9487 qex 9865 ixxex 10133 iccen 10240 serclim0 11865 climle 11894 iserabs 12035 isumshft 12050 explecnv 12065 prodfclim1 12104 prmex 12684 exmidunben 13046 prdsex 13351 prdsval 13355 fngsum 13470 igsumvalx 13471 metuex 14568 cnfldstr 14571 cnfldle 14580 znval 14649 znle 14650 znbaslemnn 14652 istopon 14736 dmtopon 14746 lmres 14971 climcncf 15307 reldvg 15402 |
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