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Mirrors > Home > MPE Home > Th. List > 2pwne | Structured version Visualization version GIF version |
Description: No set equals the power set of its power set. (Contributed by NM, 17-Nov-2008.) |
Ref | Expression |
---|---|
2pwne | ⊢ (𝐴 ∈ 𝑉 → 𝒫 𝒫 𝐴 ≠ 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sdomirr 8850 | . . 3 ⊢ ¬ 𝒫 𝒫 𝐴 ≺ 𝒫 𝒫 𝐴 | |
2 | canth2g 8867 | . . . . 5 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ≺ 𝒫 𝐴) | |
3 | pwexg 5296 | . . . . . 6 ⊢ (𝐴 ∈ 𝑉 → 𝒫 𝐴 ∈ V) | |
4 | canth2g 8867 | . . . . . 6 ⊢ (𝒫 𝐴 ∈ V → 𝒫 𝐴 ≺ 𝒫 𝒫 𝐴) | |
5 | 3, 4 | syl 17 | . . . . 5 ⊢ (𝐴 ∈ 𝑉 → 𝒫 𝐴 ≺ 𝒫 𝒫 𝐴) |
6 | sdomtr 8851 | . . . . 5 ⊢ ((𝐴 ≺ 𝒫 𝐴 ∧ 𝒫 𝐴 ≺ 𝒫 𝒫 𝐴) → 𝐴 ≺ 𝒫 𝒫 𝐴) | |
7 | 2, 5, 6 | syl2anc 583 | . . . 4 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ≺ 𝒫 𝒫 𝐴) |
8 | breq1 5073 | . . . 4 ⊢ (𝒫 𝒫 𝐴 = 𝐴 → (𝒫 𝒫 𝐴 ≺ 𝒫 𝒫 𝐴 ↔ 𝐴 ≺ 𝒫 𝒫 𝐴)) | |
9 | 7, 8 | syl5ibrcom 246 | . . 3 ⊢ (𝐴 ∈ 𝑉 → (𝒫 𝒫 𝐴 = 𝐴 → 𝒫 𝒫 𝐴 ≺ 𝒫 𝒫 𝐴)) |
10 | 1, 9 | mtoi 198 | . 2 ⊢ (𝐴 ∈ 𝑉 → ¬ 𝒫 𝒫 𝐴 = 𝐴) |
11 | 10 | neqned 2949 | 1 ⊢ (𝐴 ∈ 𝑉 → 𝒫 𝒫 𝐴 ≠ 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1539 ∈ wcel 2108 ≠ wne 2942 Vcvv 3422 𝒫 cpw 4530 class class class wbr 5070 ≺ csdm 8690 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-ral 3068 df-rex 3069 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-op 4565 df-uni 4837 df-br 5071 df-opab 5133 df-mpt 5154 df-id 5480 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-er 8456 df-en 8692 df-dom 8693 df-sdom 8694 |
This theorem is referenced by: (None) |
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