Theorem permaxpow 45042

Description: The Axiom of Power Sets ax-pow 5298 holds in permutation models. Part of Exercise II.9.2 of [Kunen2] p. 148. (Contributed by Eric Schmidt, 6-Nov-2025.)

Hypotheses

Ref	Expression
permmodel.1	⊢ 𝐹:V–1-1-onto→V
permmodel.2	⊢ 𝑅 = (◡𝐹 ∘ E )

Assertion

Ref	Expression
permaxpow	⊢ ∃𝑦∀𝑧(∀𝑤(𝑤𝑅𝑧 → 𝑤𝑅𝑥) → 𝑧𝑅𝑦)

Distinct variable groups:   𝑥,𝑦,𝑧,𝑤   𝑦,𝐹,𝑧,𝑤   𝑦,𝑅

Allowed substitution hints:   𝑅(𝑥,𝑧,𝑤)   𝐹(𝑥)

Proof of Theorem permaxpow

Step	Hyp	Ref	Expression
1		fvex 6830	. 2 ⊢ (◡𝐹‘(◡𝐹 “ 𝒫 (𝐹‘𝑥))) ∈ V
2		breq2 5090	. . . 4 ⊢ (𝑦 = (◡𝐹‘(◡𝐹 “ 𝒫 (𝐹‘𝑥))) → (𝑧𝑅𝑦 ↔ 𝑧𝑅(◡𝐹‘(◡𝐹 “ 𝒫 (𝐹‘𝑥)))))
3	2	imbi2d 340	. . 3 ⊢ (𝑦 = (◡𝐹‘(◡𝐹 “ 𝒫 (𝐹‘𝑥))) → ((∀𝑤(𝑤𝑅𝑧 → 𝑤𝑅𝑥) → 𝑧𝑅𝑦) ↔ (∀𝑤(𝑤𝑅𝑧 → 𝑤𝑅𝑥) → 𝑧𝑅(◡𝐹‘(◡𝐹 “ 𝒫 (𝐹‘𝑥))))))
4	3	albidv 1921	. 2 ⊢ (𝑦 = (◡𝐹‘(◡𝐹 “ 𝒫 (𝐹‘𝑥))) → (∀𝑧(∀𝑤(𝑤𝑅𝑧 → 𝑤𝑅𝑥) → 𝑧𝑅𝑦) ↔ ∀𝑧(∀𝑤(𝑤𝑅𝑧 → 𝑤𝑅𝑥) → 𝑧𝑅(◡𝐹‘(◡𝐹 “ 𝒫 (𝐹‘𝑥))))))
5		permmodel.1	. . . . . 6 ⊢ 𝐹:V–1-1-onto→V
6		permmodel.2	. . . . . 6 ⊢ 𝑅 = (◡𝐹 ∘ E )
7		vex 3440	. . . . . 6 ⊢ 𝑧 ∈ V
8		dff1o3 6764	. . . . . . . . 9 ⊢ (𝐹:V–1-1-onto→V ↔ (𝐹:V–onto→V ∧ Fun ◡𝐹))
9	5, 8	mpbi 230	. . . . . . . 8 ⊢ (𝐹:V–onto→V ∧ Fun ◡𝐹)
10	9	simpri 485	. . . . . . 7 ⊢ Fun ◡𝐹
11		fvex 6830	. . . . . . . . 9 ⊢ (𝐹‘𝑥) ∈ V
12	11	pwex 5313	. . . . . . . 8 ⊢ 𝒫 (𝐹‘𝑥) ∈ V
13	12	funimaex 6564	. . . . . . 7 ⊢ (Fun ◡𝐹 → (◡𝐹 “ 𝒫 (𝐹‘𝑥)) ∈ V)
14	10, 13	ax-mp 5	. . . . . 6 ⊢ (◡𝐹 “ 𝒫 (𝐹‘𝑥)) ∈ V
15	5, 6, 7, 14	brpermmodelcnv 45037	. . . . 5 ⊢ (𝑧𝑅(◡𝐹‘(◡𝐹 “ 𝒫 (𝐹‘𝑥))) ↔ 𝑧 ∈ (◡𝐹 “ 𝒫 (𝐹‘𝑥)))
16		f1ofn 6759	. . . . . . . 8 ⊢ (𝐹:V–1-1-onto→V → 𝐹 Fn V)
17	5, 16	ax-mp 5	. . . . . . 7 ⊢ 𝐹 Fn V
18		elpreima 6986	. . . . . . 7 ⊢ (𝐹 Fn V → (𝑧 ∈ (◡𝐹 “ 𝒫 (𝐹‘𝑥)) ↔ (𝑧 ∈ V ∧ (𝐹‘𝑧) ∈ 𝒫 (𝐹‘𝑥))))
19	17, 18	ax-mp 5	. . . . . 6 ⊢ (𝑧 ∈ (◡𝐹 “ 𝒫 (𝐹‘𝑥)) ↔ (𝑧 ∈ V ∧ (𝐹‘𝑧) ∈ 𝒫 (𝐹‘𝑥)))
20	7, 19	mpbiran 709	. . . . 5 ⊢ (𝑧 ∈ (◡𝐹 “ 𝒫 (𝐹‘𝑥)) ↔ (𝐹‘𝑧) ∈ 𝒫 (𝐹‘𝑥))
21	15, 20	bitri 275	. . . 4 ⊢ (𝑧𝑅(◡𝐹‘(◡𝐹 “ 𝒫 (𝐹‘𝑥))) ↔ (𝐹‘𝑧) ∈ 𝒫 (𝐹‘𝑥))
22		df-ss 3914	. . . . 5 ⊢ ((𝐹‘𝑧) ⊆ (𝐹‘𝑥) ↔ ∀𝑤(𝑤 ∈ (𝐹‘𝑧) → 𝑤 ∈ (𝐹‘𝑥)))
23		fvex 6830	. . . . . 6 ⊢ (𝐹‘𝑧) ∈ V
24	23	elpw 4549	. . . . 5 ⊢ ((𝐹‘𝑧) ∈ 𝒫 (𝐹‘𝑥) ↔ (𝐹‘𝑧) ⊆ (𝐹‘𝑥))
25		vex 3440	. . . . . . . 8 ⊢ 𝑤 ∈ V
26	5, 6, 25, 7	brpermmodel 45036	. . . . . . 7 ⊢ (𝑤𝑅𝑧 ↔ 𝑤 ∈ (𝐹‘𝑧))
27		vex 3440	. . . . . . . 8 ⊢ 𝑥 ∈ V
28	5, 6, 25, 27	brpermmodel 45036	. . . . . . 7 ⊢ (𝑤𝑅𝑥 ↔ 𝑤 ∈ (𝐹‘𝑥))
29	26, 28	imbi12i 350	. . . . . 6 ⊢ ((𝑤𝑅𝑧 → 𝑤𝑅𝑥) ↔ (𝑤 ∈ (𝐹‘𝑧) → 𝑤 ∈ (𝐹‘𝑥)))
30	29	albii 1820	. . . . 5 ⊢ (∀𝑤(𝑤𝑅𝑧 → 𝑤𝑅𝑥) ↔ ∀𝑤(𝑤 ∈ (𝐹‘𝑧) → 𝑤 ∈ (𝐹‘𝑥)))
31	22, 24, 30	3bitr4i 303	. . . 4 ⊢ ((𝐹‘𝑧) ∈ 𝒫 (𝐹‘𝑥) ↔ ∀𝑤(𝑤𝑅𝑧 → 𝑤𝑅𝑥))
32	21, 31	sylbbr 236	. . 3 ⊢ (∀𝑤(𝑤𝑅𝑧 → 𝑤𝑅𝑥) → 𝑧𝑅(◡𝐹‘(◡𝐹 “ 𝒫 (𝐹‘𝑥))))
33	32	ax-gen 1796	. 2 ⊢ ∀𝑧(∀𝑤(𝑤𝑅𝑧 → 𝑤𝑅𝑥) → 𝑧𝑅(◡𝐹‘(◡𝐹 “ 𝒫 (𝐹‘𝑥))))
34	1, 4, 33	ceqsexv2d 3487	1 ⊢ ∃𝑦∀𝑧(∀𝑤(𝑤𝑅𝑧 → 𝑤𝑅𝑥) → 𝑧𝑅𝑦)

Syntax hints:   → wi 4   ↔ wb 206   ∧ wa 395  ∀wal 1539   = wceq 1541  ∃wex 1780   ∈ wcel 2111  Vcvv 3436   ⊆ wss 3897  𝒫 cpw 4545   class class class wbr 5086   E cep 5510  ^◡ccnv 5610   “ cima 5614   ∘ ccom 5615  Fun wfun 6470   Fn wfn 6471  –onto→wfo 6474  –1-1-onto→wf1o 6475  ‘cfv 6476

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 1968  ax-7 2009  ax-8 2113  ax-9 2121  ax-10 2144  ax-11 2160  ax-12 2180  ax-ext 2703  ax-rep 5212  ax-sep 5229  ax-nul 5239  ax-pow 5298  ax-pr 5365

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-nf 1785  df-sb 2068  df-mo 2535  df-eu 2564  df-clab 2710  df-cleq 2723  df-clel 2806  df-ne 2929  df-ral 3048  df-rex 3057  df-rab 3396  df-v 3438  df-dif 3900  df-un 3902  df-in 3904  df-ss 3914  df-nul 4279  df-if 4471  df-pw 4547  df-sn 4572  df-pr 4574  df-op 4578  df-uni 4855  df-br 5087  df-opab 5149  df-id 5506  df-eprel 5511  df-xp 5617  df-rel 5618  df-cnv 5619  df-co 5620  df-dm 5621  df-rn 5622  df-res 5623  df-ima 5624  df-iota 6432  df-fun 6478  df-fn 6479  df-f 6480  df-f1 6481  df-fo 6482  df-f1o 6483  df-fv 6484

This theorem is referenced by: (None)