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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 4270 | . 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 4249 |
| 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 4326 ord3ex 4327 epse 4487 opabex 5941 mptexw 6342 oprabex 6361 mpoexw 6449 phplem2 7154 phpm 7167 snexxph 7267 sbthlem2 7275 2omotaplemst 7624 niex 7679 enqex 7727 enq0ex 7806 npex 7840 ltnqex 7916 gtnqex 7917 recexprlemell 7989 recexprlemelu 7990 enrex 8104 axcnex 8226 peano5nnnn 8259 reex 8313 nnex 9312 zex 9657 qex 10041 ixxex 10311 iccen 10419 serclim0 12087 climle 12116 iserabs 12258 isumshft 12273 explecnv 12288 prodfclim1 12327 prmex 12907 exmidunben 13366 fngzsum 13757 gzsumvalx 13758 prdsex 14221 prdsval 14222 metuex 14941 cnfldstr 14944 cnfldle 14953 znval 15020 znle 15021 znbaslemnn 15023 istopon 15163 dmtopon 15173 lmres 15398 climcncf 15734 reldvg 15829 pellexlem3 16150 |
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