Theorem pw2eng 8221

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 4978	. . 3 ⊢ (𝐴 ∈ 𝑉 → 𝒫 𝐴 ∈ V)
2		ovexd 6824	. . 3 ⊢ (𝐴 ∈ 𝑉 → ({∅, {∅}} ↑𝑚 𝐴) ∈ V)
3		id 22	. . . 4 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ 𝑉)
4		0ex 4921	. . . . 5 ⊢ ∅ ∈ V
5	4	a1i 11	. . . 4 ⊢ (𝐴 ∈ 𝑉 → ∅ ∈ V)
6		p0ex 4981	. . . . 5 ⊢ {∅} ∈ V
7	6	a1i 11	. . . 4 ⊢ (𝐴 ∈ 𝑉 → {∅} ∈ V)
8		0nep0 4964	. . . . 5 ⊢ ∅ ≠ {∅}
9	8	a1i 11	. . . 4 ⊢ (𝐴 ∈ 𝑉 → ∅ ≠ {∅})
10		eqid 2770	. . . 4 ⊢ (𝑥 ∈ 𝒫 𝐴 ↦ (𝑧 ∈ 𝐴 ↦ if(𝑧 ∈ 𝑥, {∅}, ∅))) = (𝑥 ∈ 𝒫 𝐴 ↦ (𝑧 ∈ 𝐴 ↦ if(𝑧 ∈ 𝑥, {∅}, ∅)))
11	3, 5, 7, 9, 10	pw2f1o 8220	. . 3 ⊢ (𝐴 ∈ 𝑉 → (𝑥 ∈ 𝒫 𝐴 ↦ (𝑧 ∈ 𝐴 ↦ if(𝑧 ∈ 𝑥, {∅}, ∅))):𝒫 𝐴–1-1-onto→({∅, {∅}} ↑𝑚 𝐴))
12		f1oen2g 8125	. . 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 1475	. 2 ⊢ (𝐴 ∈ 𝑉 → 𝒫 𝐴 ≈ ({∅, {∅}} ↑𝑚 𝐴))
14		df2o2 7727	. . 3 ⊢ 2𝑜 = {∅, {∅}}
15	14	oveq1i 6802	. 2 ⊢ (2𝑜 ↑𝑚 𝐴) = ({∅, {∅}} ↑𝑚 𝐴)
16	13, 15	syl6breqr 4826	1 ⊢ (𝐴 ∈ 𝑉 → 𝒫 𝐴 ≈ (2𝑜 ↑𝑚 𝐴))

Syntax hints:   → wi 4   ∈ wcel 2144   ≠ wne 2942  Vcvv 3349  ∅c0 4061  ifcif 4223  𝒫 cpw 4295  {csn 4314  {cpr 4316   class class class wbr 4784   ↦ cmpt 4861  –1-1-onto→wf1o 6030  (class class class)co 6792  2_𝑜c2o 7706   ↑_𝑚 cmap 8008   ≈ cen 8105

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1869  ax-4 1884  ax-5 1990  ax-6 2056  ax-7 2092  ax-8 2146  ax-9 2153  ax-10 2173  ax-11 2189  ax-12 2202  ax-13 2407  ax-ext 2750  ax-sep 4912  ax-nul 4920  ax-pow 4971  ax-pr 5034  ax-un 7095

This theorem depends on definitions:  df-bi 197  df-an 383  df-or 827  df-3an 1072  df-tru 1633  df-ex 1852  df-nf 1857  df-sb 2049  df-eu 2621  df-mo 2622  df-clab 2757  df-cleq 2763  df-clel 2766  df-nfc 2901  df-ne 2943  df-ral 3065  df-rex 3066  df-rab 3069  df-v 3351  df-sbc 3586  df-dif 3724  df-un 3726  df-in 3728  df-ss 3735  df-nul 4062  df-if 4224  df-pw 4297  df-sn 4315  df-pr 4317  df-op 4321  df-uni 4573  df-br 4785  df-opab 4845  df-mpt 4862  df-id 5157  df-xp 5255  df-rel 5256  df-cnv 5257  df-co 5258  df-dm 5259  df-rn 5260  df-res 5261  df-ima 5262  df-suc 5872  df-iota 5994  df-fun 6033  df-fn 6034  df-f 6035  df-f1 6036  df-fo 6037  df-f1o 6038  df-fv 6039  df-ov 6795  df-oprab 6796  df-mpt2 6797  df-1o 7712  df-2o 7713  df-map 8010  df-en 8109

This theorem is referenced by:  pw2en  8222  pwen  8288  mappwen  9134  pwcdaen  9208  ackbij1lem5  9247  hauspwdom  21524  enrelmap  38810