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Related theorems GIF version |
| Description: Membership in a power class. Theorem 86 of [Suppes] p. 47. |
| Ref | Expression |
|---|---|
| elpw.1 | ⊢ A ∈ V |
| Ref | Expression |
|---|---|
| elpw | ⊢ (A ∈ ℘B ↔ A ⊆ B) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elpw.1 | . 2 ⊢ A ∈ V | |
| 2 | eleq1 1149 | . 2 ⊢ (x = A → (x ∈ ℘B ↔ A ∈ ℘B)) | |
| 3 | sseq1 1521 | . 2 ⊢ (x = A → (x ⊆ B ↔ A ⊆ B)) | |
| 4 | df-pw 1799 | . . 3 ⊢ ℘B = {x∣x ⊆ B} | |
| 5 | 4 | cleqabi 1176 | . 2 ⊢ (x ∈ ℘B ↔ x ⊆ B) |
| 6 | 1, 2, 3, 5 | vtoclb 1381 | 1 ⊢ (A ∈ ℘B ↔ A ⊆ B) |
| Colors of variables: wff set class |
| Syntax hints: ↔ wb 127 ∈ wcel 1092 Vcvv 1348 ⊆ wss 1487 ℘cpw 1798 |
| This theorem is referenced by: elpwg 1802 hbpw 1804 pwid 1805 prsspw 1858 snelpw 1861 sspwb 1863 ssextss 1864 pwv 1884 pwin 1915 pwunss 1916 pwssun 1917 unipw 1960 pwuni 1961 iinpw 2038 iunpwss 2039 iunpw 2040 dftr4 2046 onpwsuc 2315 xpex 2488 canth 2945 pw2en 3348 ssenen 3399 inf3lem6 3469 setind2 3493 r1tr 3498 tz9.12lem3 3505 rankel 3524 rankval3 3525 rankpw 3528 numthlem 3598 infxpidmlem9 4941 infmap2lem2 4952 ocvalt 5161 spanvalt 5300 hsupval2t 5301 sshjvalt 5321 sshjval3t 5327 |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-7 676 ax-gen 677 ax-8 798 ax-9 799 ax-10 800 ax-11 801 ax-12 802 ax-16 922 ax-17 925 ax-ext 1074 |
| This theorem depends on definitions: df-bi 128 df-an 198 df-ex 679 df-sb 853 df-clab 1093 df-cleq 1097 df-clel 1099 df-v 1349 df-in 1491 df-ss 1492 df-pw 1799 |