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| Mirrors > Home > ILE Home > Th. List > pwnex | GIF version | ||
| Description: The class of all power sets is a proper class. See also snnex 4499. (Contributed by BJ, 2-May-2021.) |
| Ref | Expression |
|---|---|
| pwnex | ⊢ {𝑥 ∣ ∃𝑦 𝑥 = 𝒫 𝑦} ∉ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | abnex 4498 | . . 3 ⊢ (∀𝑦(𝒫 𝑦 ∈ V ∧ 𝑦 ∈ 𝒫 𝑦) → ¬ {𝑥 ∣ ∃𝑦 𝑥 = 𝒫 𝑦} ∈ V) | |
| 2 | df-nel 2473 | . . 3 ⊢ ({𝑥 ∣ ∃𝑦 𝑥 = 𝒫 𝑦} ∉ V ↔ ¬ {𝑥 ∣ ∃𝑦 𝑥 = 𝒫 𝑦} ∈ V) | |
| 3 | 1, 2 | sylibr 134 | . 2 ⊢ (∀𝑦(𝒫 𝑦 ∈ V ∧ 𝑦 ∈ 𝒫 𝑦) → {𝑥 ∣ ∃𝑦 𝑥 = 𝒫 𝑦} ∉ V) |
| 4 | vpwex 4227 | . . 3 ⊢ 𝒫 𝑦 ∈ V | |
| 5 | vex 2776 | . . . 4 ⊢ 𝑦 ∈ V | |
| 6 | 5 | pwid 3632 | . . 3 ⊢ 𝑦 ∈ 𝒫 𝑦 |
| 7 | 4, 6 | pm3.2i 272 | . 2 ⊢ (𝒫 𝑦 ∈ V ∧ 𝑦 ∈ 𝒫 𝑦) |
| 8 | 3, 7 | mpg 1475 | 1 ⊢ {𝑥 ∣ ∃𝑦 𝑥 = 𝒫 𝑦} ∉ V |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 ∧ wa 104 ∀wal 1371 = wceq 1373 ∃wex 1516 ∈ wcel 2177 {cab 2192 ∉ wnel 2472 Vcvv 2773 𝒫 cpw 3617 |
| 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-in1 615 ax-in2 616 ax-io 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-13 2179 ax-14 2180 ax-ext 2188 ax-sep 4166 ax-pow 4222 ax-un 4484 |
| This theorem depends on definitions: df-bi 117 df-tru 1376 df-fal 1379 df-nf 1485 df-sb 1787 df-clab 2193 df-cleq 2199 df-clel 2202 df-nfc 2338 df-nel 2473 df-ral 2490 df-rex 2491 df-v 2775 df-in 3173 df-ss 3180 df-pw 3619 df-sn 3640 df-uni 3853 df-iun 3931 |
| This theorem is referenced by: topnex 14602 |
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