| Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
| Mirrors > Home > MPE Home > Th. List > pw2eng | Structured version Visualization version GIF version | ||
| Description: The power set of a set is equinumerous to set exponentiation with a base of ordinal 2o. (Contributed by FL, 22-Feb-2011.) (Revised by Mario Carneiro, 1-Jul-2015.) |
| Ref | Expression |
|---|---|
| pw2eng | ⊢ (𝐴 ∈ 𝑉 → 𝒫 𝐴 ≈ (2o ↑m 𝐴)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pwexg 5335 | . . 3 ⊢ (𝐴 ∈ 𝑉 → 𝒫 𝐴 ∈ V) | |
| 2 | ovexd 7424 | . . 3 ⊢ (𝐴 ∈ 𝑉 → ({∅, {∅}} ↑m 𝐴) ∈ V) | |
| 3 | id 22 | . . . 4 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ 𝑉) | |
| 4 | 0ex 5264 | . . . . 5 ⊢ ∅ ∈ V | |
| 5 | 4 | a1i 11 | . . . 4 ⊢ (𝐴 ∈ 𝑉 → ∅ ∈ V) |
| 6 | p0ex 5341 | . . . . 5 ⊢ {∅} ∈ V | |
| 7 | 6 | a1i 11 | . . . 4 ⊢ (𝐴 ∈ 𝑉 → {∅} ∈ V) |
| 8 | 0nep0 5315 | . . . . 5 ⊢ ∅ ≠ {∅} | |
| 9 | 8 | a1i 11 | . . . 4 ⊢ (𝐴 ∈ 𝑉 → ∅ ≠ {∅}) |
| 10 | eqid 2730 | . . . 4 ⊢ (𝑥 ∈ 𝒫 𝐴 ↦ (𝑧 ∈ 𝐴 ↦ if(𝑧 ∈ 𝑥, {∅}, ∅))) = (𝑥 ∈ 𝒫 𝐴 ↦ (𝑧 ∈ 𝐴 ↦ if(𝑧 ∈ 𝑥, {∅}, ∅))) | |
| 11 | 3, 5, 7, 9, 10 | pw2f1o 9050 | . . 3 ⊢ (𝐴 ∈ 𝑉 → (𝑥 ∈ 𝒫 𝐴 ↦ (𝑧 ∈ 𝐴 ↦ if(𝑧 ∈ 𝑥, {∅}, ∅))):𝒫 𝐴–1-1-onto→({∅, {∅}} ↑m 𝐴)) |
| 12 | f1oen2g 8942 | . . 3 ⊢ ((𝒫 𝐴 ∈ V ∧ ({∅, {∅}} ↑m 𝐴) ∈ V ∧ (𝑥 ∈ 𝒫 𝐴 ↦ (𝑧 ∈ 𝐴 ↦ if(𝑧 ∈ 𝑥, {∅}, ∅))):𝒫 𝐴–1-1-onto→({∅, {∅}} ↑m 𝐴)) → 𝒫 𝐴 ≈ ({∅, {∅}} ↑m 𝐴)) | |
| 13 | 1, 2, 11, 12 | syl3anc 1373 | . 2 ⊢ (𝐴 ∈ 𝑉 → 𝒫 𝐴 ≈ ({∅, {∅}} ↑m 𝐴)) |
| 14 | df2o2 8445 | . . 3 ⊢ 2o = {∅, {∅}} | |
| 15 | 14 | oveq1i 7399 | . 2 ⊢ (2o ↑m 𝐴) = ({∅, {∅}} ↑m 𝐴) |
| 16 | 13, 15 | breqtrrdi 5151 | 1 ⊢ (𝐴 ∈ 𝑉 → 𝒫 𝐴 ≈ (2o ↑m 𝐴)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2109 ≠ wne 2926 Vcvv 3450 ∅c0 4298 ifcif 4490 𝒫 cpw 4565 {csn 4591 {cpr 4593 class class class wbr 5109 ↦ cmpt 5190 –1-1-onto→wf1o 6512 (class class class)co 7389 2oc2o 8430 ↑m cmap 8801 ≈ cen 8917 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2702 ax-sep 5253 ax-nul 5263 ax-pow 5322 ax-pr 5389 ax-un 7713 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2534 df-eu 2563 df-clab 2709 df-cleq 2722 df-clel 2804 df-nfc 2879 df-ne 2927 df-ral 3046 df-rex 3055 df-rab 3409 df-v 3452 df-sbc 3756 df-dif 3919 df-un 3921 df-in 3923 df-ss 3933 df-nul 4299 df-if 4491 df-pw 4567 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4874 df-br 5110 df-opab 5172 df-mpt 5191 df-id 5535 df-xp 5646 df-rel 5647 df-cnv 5648 df-co 5649 df-dm 5650 df-rn 5651 df-res 5652 df-ima 5653 df-suc 6340 df-iota 6466 df-fun 6515 df-fn 6516 df-f 6517 df-f1 6518 df-fo 6519 df-f1o 6520 df-fv 6521 df-ov 7392 df-oprab 7393 df-mpo 7394 df-1o 8436 df-2o 8437 df-map 8803 df-en 8921 |
| This theorem is referenced by: pw2en 9052 pwen 9119 mappwen 10071 pwdjuen 10141 ackbij1lem5 10182 hauspwdom 23394 enrelmap 43979 |
| Copyright terms: Public domain | W3C validator |