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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 4265 | . 2 ⊢ (𝐴 ⊆ 𝐵 → 𝐴 ∈ V) |
| 4 | 1, 3 | ax-mp 5 | 1 ⊢ 𝐴 ∈ V |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2209 Vcvv 2821 ⊆ wss 3220 |
| 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 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 4244 |
| This theorem 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 referenced by: pp0ex 4321 ord3ex 4322 epse 4482 opabex 5932 mptexw 6332 oprabex 6351 mpoexw 6439 phplem2 7144 phpm 7157 snexxph 7257 sbthlem2 7265 2omotaplemst 7614 niex 7669 enqex 7717 enq0ex 7796 npex 7830 ltnqex 7906 gtnqex 7907 recexprlemell 7979 recexprlemelu 7980 enrex 8094 axcnex 8216 peano5nnnn 8249 reex 8303 nnex 9289 zex 9632 qex 10011 ixxex 10280 iccen 10388 serclim0 12049 climle 12078 iserabs 12220 isumshft 12235 explecnv 12250 prodfclim1 12289 prmex 12869 exmidunben 13295 fngzsum 13685 gzsumvalx 13686 prdsex 14149 prdsval 14150 metuex 14864 cnfldstr 14867 cnfldle 14876 znval 14943 znle 14944 znbaslemnn 14946 istopon 15037 dmtopon 15047 lmres 15272 climcncf 15608 reldvg 15703 pellexlem3 16007 |
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