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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 9310 zex 9653 qex 10032 ixxex 10301 iccen 10409 serclim0 12071 climle 12100 iserabs 12242 isumshft 12257 explecnv 12272 prodfclim1 12311 prmex 12891 exmidunben 13317 fngzsum 13708 gzsumvalx 13709 prdsex 14172 prdsval 14173 metuex 14892 cnfldstr 14895 cnfldle 14904 znval 14971 znle 14972 znbaslemnn 14974 istopon 15114 dmtopon 15124 lmres 15349 climcncf 15685 reldvg 15780 pellexlem3 16093 |
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