Theorem pw2eng 8066

Description: The power set of a set is equinumerous to set exponentiation with a base of ordinal 2_𝑜. (Contributed by FL, 22-Feb-2011.) (Revised by Mario Carneiro, 1-Jul-2015.)

Assertion

Ref	Expression
pw2eng	⊢ (𝐴 ∈ 𝑉 → 𝒫 𝐴 ≈ (2𝑜 ↑𝑚 𝐴))

Proof of Theorem pw2eng

Dummy variables 𝑥 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		pwexg 4850	. . 3 ⊢ (𝐴 ∈ 𝑉 → 𝒫 𝐴 ∈ V)
2		ovexd 6680	. . 3 ⊢ (𝐴 ∈ 𝑉 → ({∅, {∅}} ↑𝑚 𝐴) ∈ V)
3		id 22	. . . 4 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ 𝑉)
4		0ex 4790	. . . . 5 ⊢ ∅ ∈ V
5	4	a1i 11	. . . 4 ⊢ (𝐴 ∈ 𝑉 → ∅ ∈ V)
6		p0ex 4853	. . . . 5 ⊢ {∅} ∈ V
7	6	a1i 11	. . . 4 ⊢ (𝐴 ∈ 𝑉 → {∅} ∈ V)
8		0nep0 4836	. . . . 5 ⊢ ∅ ≠ {∅}
9	8	a1i 11	. . . 4 ⊢ (𝐴 ∈ 𝑉 → ∅ ≠ {∅})
10		eqid 2622	. . . 4 ⊢ (𝑥 ∈ 𝒫 𝐴 ↦ (𝑧 ∈ 𝐴 ↦ if(𝑧 ∈ 𝑥, {∅}, ∅))) = (𝑥 ∈ 𝒫 𝐴 ↦ (𝑧 ∈ 𝐴 ↦ if(𝑧 ∈ 𝑥, {∅}, ∅)))
11	3, 5, 7, 9, 10	pw2f1o 8065	. . 3 ⊢ (𝐴 ∈ 𝑉 → (𝑥 ∈ 𝒫 𝐴 ↦ (𝑧 ∈ 𝐴 ↦ if(𝑧 ∈ 𝑥, {∅}, ∅))):𝒫 𝐴–1-1-onto→({∅, {∅}} ↑𝑚 𝐴))
12		f1oen2g 7972	. . 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 1326	. 2 ⊢ (𝐴 ∈ 𝑉 → 𝒫 𝐴 ≈ ({∅, {∅}} ↑𝑚 𝐴))
14		df2o2 7574	. . 3 ⊢ 2𝑜 = {∅, {∅}}
15	14	oveq1i 6660	. 2 ⊢ (2𝑜 ↑𝑚 𝐴) = ({∅, {∅}} ↑𝑚 𝐴)
16	13, 15	syl6breqr 4695	1 ⊢ (𝐴 ∈ 𝑉 → 𝒫 𝐴 ≈ (2𝑜 ↑𝑚 𝐴))

Syntax hints:   → wi 4   ∈ wcel 1990   ≠ wne 2794  Vcvv 3200  ∅c0 3915  ifcif 4086  𝒫 cpw 4158  {csn 4177  {cpr 4179   class class class wbr 4653   ↦ cmpt 4729  –1-1-onto→wf1o 5887  (class class class)co 6650  2_𝑜c2o 7554   ↑_𝑚 cmap 7857   ≈ cen 7952

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-ral 2917  df-rex 2918  df-rab 2921  df-v 3202  df-sbc 3436  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-br 4654  df-opab 4713  df-mpt 4730  df-id 5024  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-suc 5729  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-1o 7560  df-2o 7561  df-map 7859  df-en 7956

This theorem is referenced by:  pw2en  8067  pwen  8133  mappwen  8935  pwcdaen  9007  hauspwdom  21304  enrelmap  38291