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| Mirrors > Home > MPE Home > Th. List > Mathboxes > pwinfi | Structured version Visualization version GIF version | ||
| Description: The powerclass of an infinite set is an infinite set, and vice-versa. (Contributed by RP, 21-Mar-2020.) |
| Ref | Expression |
|---|---|
| pwinfi | ⊢ (𝐴 ∈ (V ∖ Fin) ↔ 𝒫 𝐴 ∈ (V ∖ Fin)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | vuniex 7783 | . . . 4 ⊢ ∪ 𝑥 ∈ V | |
| 2 | vpwex 5344 | . . . 4 ⊢ 𝒫 𝑥 ∈ V | |
| 3 | 1, 2 | pm3.2i 476 | . . 3 ⊢ (∪ 𝑥 ∈ V ∧ 𝒫 𝑥 ∈ V) |
| 4 | 3 | rgenw 3084 | . 2 ⊢ ∀𝑥 ∈ V (∪ 𝑥 ∈ V ∧ 𝒫 𝑥 ∈ V) |
| 5 | pwinfig 44765 | . 2 ⊢ (∀𝑥 ∈ V (∪ 𝑥 ∈ V ∧ 𝒫 𝑥 ∈ V) → (𝐴 ∈ (V ∖ Fin) ↔ 𝒫 𝐴 ∈ (V ∖ Fin))) | |
| 6 | 4, 5 | ax-mp 5 | 1 ⊢ (𝐴 ∈ (V ∖ Fin) ↔ 𝒫 𝐴 ∈ (V ∖ Fin)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ↔ wb 209 ∧ wa 401 ∈ wcel 2147 ∀wral 3080 Vcvv 3454 ∖ cdif 4048 𝒫 cpw 4560 ∪ cuni 4870 Fincfn 9004 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-sep 5253 ax-nul 5264 ax-pow 5332 ax-pr 5396 ax-un 7778 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-ral 3081 df-rex 3091 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4839 df-uni 4871 df-br 5107 df-opab 5172 df-mpt 5191 df-tr 5217 df-id 5551 df-eprel 5556 df-po 5564 df-so 5565 df-fr 5609 df-we 5611 df-xp 5662 df-rel 5663 df-cnv 5664 df-co 5665 df-dm 5666 df-rn 5667 df-res 5668 df-ima 5669 df-ord 6386 df-on 6387 df-lim 6388 df-suc 6389 df-iota 6515 df-fun 6563 df-fn 6564 df-f 6565 df-f1 6566 df-fo 6567 df-f1o 6568 df-fv 6569 df-om 7905 df-1o 8507 df-en 9005 df-dom 9006 df-fin 9008 |
| This theorem is used by: (None) |
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