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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 4252 | . 2 ⊢ (𝐴 ⊆ 𝐵 → 𝐴 ∈ V) |
| 4 | 1, 3 | ax-mp 5 | 1 ⊢ 𝐴 ∈ V |
| Colors of variables: wff set class |
| Syntax hints: ∈ wcel 2205 Vcvv 2815 ⊆ wss 3214 |
| 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 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-ext 2216 ax-sep 4233 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1812 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-v 2817 df-in 3220 df-ss 3227 |
| This theorem is referenced by: zfausab 4259 pp0ex 4307 ord3ex 4308 epse 4468 opabex 5915 mptexw 6315 oprabex 6334 mpoexw 6422 phplem2 7120 phpm 7133 snexxph 7233 sbthlem2 7241 2omotaplemst 7588 niex 7643 enqex 7691 enq0ex 7770 npex 7804 ltnqex 7880 gtnqex 7881 recexprlemell 7953 recexprlemelu 7954 enrex 8068 axcnex 8190 peano5nnnn 8223 reex 8277 nnex 9260 zex 9603 qex 9982 ixxex 10251 iccen 10359 serclim0 12015 climle 12044 iserabs 12186 isumshft 12201 explecnv 12216 prodfclim1 12255 prmex 12835 exmidunben 13261 fngsum 13651 igsumvalx 13652 prdsex 14114 prdsval 14115 metuex 14829 cnfldstr 14832 cnfldle 14841 znval 14910 znle 14911 znbaslemnn 14913 istopon 15004 dmtopon 15014 lmres 15239 climcncf 15575 reldvg 15670 pellexlem3 15973 |
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