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Mirrors > Home > MPE Home > Th. List > pwnex | Structured version Visualization version GIF version |
Description: The class of all power sets is a proper class. See also snnex 7749. (Contributed by BJ, 2-May-2021.) |
Ref | Expression |
---|---|
pwnex | ⊢ {𝑥 ∣ ∃𝑦 𝑥 = 𝒫 𝑦} ∉ V |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | abnex 7748 | . . 3 ⊢ (∀𝑦(𝒫 𝑦 ∈ V ∧ 𝑦 ∈ 𝒫 𝑦) → ¬ {𝑥 ∣ ∃𝑦 𝑥 = 𝒫 𝑦} ∈ V) | |
2 | df-nel 3046 | . . 3 ⊢ ({𝑥 ∣ ∃𝑦 𝑥 = 𝒫 𝑦} ∉ V ↔ ¬ {𝑥 ∣ ∃𝑦 𝑥 = 𝒫 𝑦} ∈ V) | |
3 | 1, 2 | sylibr 233 | . 2 ⊢ (∀𝑦(𝒫 𝑦 ∈ V ∧ 𝑦 ∈ 𝒫 𝑦) → {𝑥 ∣ ∃𝑦 𝑥 = 𝒫 𝑦} ∉ V) |
4 | vpwex 5375 | . . 3 ⊢ 𝒫 𝑦 ∈ V | |
5 | vex 3477 | . . . 4 ⊢ 𝑦 ∈ V | |
6 | 5 | pwid 4624 | . . 3 ⊢ 𝑦 ∈ 𝒫 𝑦 |
7 | 4, 6 | pm3.2i 470 | . 2 ⊢ (𝒫 𝑦 ∈ V ∧ 𝑦 ∈ 𝒫 𝑦) |
8 | 3, 7 | mpg 1798 | 1 ⊢ {𝑥 ∣ ∃𝑦 𝑥 = 𝒫 𝑦} ∉ V |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ∧ wa 395 ∀wal 1538 = wceq 1540 ∃wex 1780 ∈ wcel 2105 {cab 2708 ∉ wnel 3045 Vcvv 3473 𝒫 cpw 4602 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1912 ax-6 1970 ax-7 2010 ax-8 2107 ax-9 2115 ax-11 2153 ax-ext 2702 ax-sep 5299 ax-pow 5363 ax-un 7729 |
This theorem depends on definitions: df-bi 206 df-an 396 df-tru 1543 df-ex 1781 df-sb 2067 df-clab 2709 df-cleq 2723 df-clel 2809 df-nel 3046 df-ral 3061 df-rex 3070 df-rab 3432 df-v 3475 df-in 3955 df-ss 3965 df-pw 4604 df-sn 4629 df-uni 4909 df-iun 4999 |
This theorem is referenced by: topnex 22819 |
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