| Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
| Mirrors > Home > ILE Home > Th. List > pwnex | GIF version | ||
| Description: The class of all power sets is a proper class. See also snnex 4545. (Contributed by BJ, 2-May-2021.) |
| Ref | Expression |
|---|---|
| pwnex | ⊢ {𝑥 ∣ ∃𝑦 𝑥 = 𝒫 𝑦} ∉ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | abnex 4544 | . . 3 ⊢ (∀𝑦(𝒫 𝑦 ∈ V ∧ 𝑦 ∈ 𝒫 𝑦) → ¬ {𝑥 ∣ ∃𝑦 𝑥 = 𝒫 𝑦} ∈ V) | |
| 2 | df-nel 2498 | . . 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 4269 | . . 3 ⊢ 𝒫 𝑦 ∈ V | |
| 5 | vex 2805 | . . . 4 ⊢ 𝑦 ∈ V | |
| 6 | 5 | pwid 3667 | . . 3 ⊢ 𝑦 ∈ 𝒫 𝑦 |
| 7 | 4, 6 | pm3.2i 272 | . 2 ⊢ (𝒫 𝑦 ∈ V ∧ 𝑦 ∈ 𝒫 𝑦) |
| 8 | 3, 7 | mpg 1499 | 1 ⊢ {𝑥 ∣ ∃𝑦 𝑥 = 𝒫 𝑦} ∉ V |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 ∧ wa 104 ∀wal 1395 = wceq 1397 ∃wex 1540 ∈ wcel 2202 {cab 2217 ∉ wnel 2497 Vcvv 2802 𝒫 cpw 3652 |
| 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 619 ax-in2 620 ax-io 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-13 2204 ax-14 2205 ax-ext 2213 ax-sep 4207 ax-pow 4264 ax-un 4530 |
| This theorem depends on definitions: df-bi 117 df-tru 1400 df-fal 1403 df-nf 1509 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-nel 2498 df-ral 2515 df-rex 2516 df-v 2804 df-in 3206 df-ss 3213 df-pw 3654 df-sn 3675 df-uni 3894 df-iun 3972 |
| This theorem is referenced by: topnex 14813 |
| Copyright terms: Public domain | W3C validator |