Theorem pw2eng 8609

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 5265	. . 3 ⊢ (𝐴 ∈ 𝑉 → 𝒫 𝐴 ∈ V)
2		ovexd 7177	. . 3 ⊢ (𝐴 ∈ 𝑉 → ({∅, {∅}} ↑m 𝐴) ∈ V)
3		id 22	. . . 4 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ 𝑉)
4		0ex 5197	. . . . 5 ⊢ ∅ ∈ V
5	4	a1i 11	. . . 4 ⊢ (𝐴 ∈ 𝑉 → ∅ ∈ V)
6		p0ex 5271	. . . . 5 ⊢ {∅} ∈ V
7	6	a1i 11	. . . 4 ⊢ (𝐴 ∈ 𝑉 → {∅} ∈ V)
8		0nep0 5244	. . . . 5 ⊢ ∅ ≠ {∅}
9	8	a1i 11	. . . 4 ⊢ (𝐴 ∈ 𝑉 → ∅ ≠ {∅})
10		eqid 2821	. . . 4 ⊢ (𝑥 ∈ 𝒫 𝐴 ↦ (𝑧 ∈ 𝐴 ↦ if(𝑧 ∈ 𝑥, {∅}, ∅))) = (𝑥 ∈ 𝒫 𝐴 ↦ (𝑧 ∈ 𝐴 ↦ if(𝑧 ∈ 𝑥, {∅}, ∅)))
11	3, 5, 7, 9, 10	pw2f1o 8608	. . 3 ⊢ (𝐴 ∈ 𝑉 → (𝑥 ∈ 𝒫 𝐴 ↦ (𝑧 ∈ 𝐴 ↦ if(𝑧 ∈ 𝑥, {∅}, ∅))):𝒫 𝐴–1-1-onto→({∅, {∅}} ↑m 𝐴))
12		f1oen2g 8512	. . 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 1367	. 2 ⊢ (𝐴 ∈ 𝑉 → 𝒫 𝐴 ≈ ({∅, {∅}} ↑m 𝐴))
14		df2o2 8104	. . 3 ⊢ 2o = {∅, {∅}}
15	14	oveq1i 7152	. 2 ⊢ (2o ↑m 𝐴) = ({∅, {∅}} ↑m 𝐴)
16	13, 15	breqtrrdi 5094	1 ⊢ (𝐴 ∈ 𝑉 → 𝒫 𝐴 ≈ (2o ↑m 𝐴))

Syntax hints:   → wi 4   ∈ wcel 2114   ≠ wne 3016  Vcvv 3486  ∅c0 4279  ifcif 4453  𝒫 cpw 4525  {csn 4553  {cpr 4555   class class class wbr 5052   ↦ cmpt 5132  –1-1-onto→wf1o 6340  (class class class)co 7142  2_oc2o 8082   ↑_m cmap 8392   ≈ cen 8492

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2793  ax-sep 5189  ax-nul 5196  ax-pow 5252  ax-pr 5316  ax-un 7447

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ne 3017  df-ral 3143  df-rex 3144  df-rab 3147  df-v 3488  df-sbc 3764  df-dif 3927  df-un 3929  df-in 3931  df-ss 3940  df-nul 4280  df-if 4454  df-pw 4527  df-sn 4554  df-pr 4556  df-op 4560  df-uni 4825  df-br 5053  df-opab 5115  df-mpt 5133  df-id 5446  df-xp 5547  df-rel 5548  df-cnv 5549  df-co 5550  df-dm 5551  df-rn 5552  df-res 5553  df-ima 5554  df-suc 6183  df-iota 6300  df-fun 6343  df-fn 6344  df-f 6345  df-f1 6346  df-fo 6347  df-f1o 6348  df-fv 6349  df-ov 7145  df-oprab 7146  df-mpo 7147  df-1o 8088  df-2o 8089  df-map 8394  df-en 8496

This theorem is referenced by:  pw2en  8610  pwen  8676  mappwen  9524  pwdjuen  9593  ackbij1lem5  9632  hauspwdom  22092  enrelmap  40433