Theorem permaxpow 45453

Description: The Axiom of Power Sets ax-pow 5294 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 6840	. 2 ⊢ (◡𝐹‘(◡𝐹 “ 𝒫 (𝐹‘𝑥))) ∈ V
2		breq2 5076	. . . 4 ⊢ (𝑦 = (◡𝐹‘(◡𝐹 “ 𝒫 (𝐹‘𝑥))) → (𝑧𝑅𝑦 ↔ 𝑧𝑅(◡𝐹‘(◡𝐹 “ 𝒫 (𝐹‘𝑥)))))
3	2	imbi2d 341	. . 3 ⊢ (𝑦 = (◡𝐹‘(◡𝐹 “ 𝒫 (𝐹‘𝑥))) → ((∀𝑤(𝑤𝑅𝑧 → 𝑤𝑅𝑥) → 𝑧𝑅𝑦) ↔ (∀𝑤(𝑤𝑅𝑧 → 𝑤𝑅𝑥) → 𝑧𝑅(◡𝐹‘(◡𝐹 “ 𝒫 (𝐹‘𝑥))))))
4	3	albidv 1927	. 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 3435	. . . . . 6 ⊢ 𝑧 ∈ V
8		dff1o3 6773	. . . . . . . . 9 ⊢ (𝐹:V–1-1-onto→V ↔ (𝐹:V–onto→V ∧ Fun ◡𝐹))
9	5, 8	mpbi 231	. . . . . . . 8 ⊢ (𝐹:V–onto→V ∧ Fun ◡𝐹)
10	9	simpri 486	. . . . . . 7 ⊢ Fun ◡𝐹
11		fvex 6840	. . . . . . . . 9 ⊢ (𝐹‘𝑥) ∈ V
12	11	pwex 5309	. . . . . . . 8 ⊢ 𝒫 (𝐹‘𝑥) ∈ V
13	12	funimaex 6573	. . . . . . 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 45448	. . . . 5 ⊢ (𝑧𝑅(◡𝐹‘(◡𝐹 “ 𝒫 (𝐹‘𝑥))) ↔ 𝑧 ∈ (◡𝐹 “ 𝒫 (𝐹‘𝑥)))
16		f1ofn 6768	. . . . . . . 8 ⊢ (𝐹:V–1-1-onto→V → 𝐹 Fn V)
17	5, 16	ax-mp 5	. . . . . . 7 ⊢ 𝐹 Fn V
18		elpreima 6999	. . . . . . 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 715	. . . . 5 ⊢ (𝑧 ∈ (◡𝐹 “ 𝒫 (𝐹‘𝑥)) ↔ (𝐹‘𝑧) ∈ 𝒫 (𝐹‘𝑥))
21	15, 20	bitri 276	. . . 4 ⊢ (𝑧𝑅(◡𝐹‘(◡𝐹 “ 𝒫 (𝐹‘𝑥))) ↔ (𝐹‘𝑧) ∈ 𝒫 (𝐹‘𝑥))
22		df-ss 3900	. . . . 5 ⊢ ((𝐹‘𝑧) ⊆ (𝐹‘𝑥) ↔ ∀𝑤(𝑤 ∈ (𝐹‘𝑧) → 𝑤 ∈ (𝐹‘𝑥)))
23		fvex 6840	. . . . . 6 ⊢ (𝐹‘𝑧) ∈ V
24	23	elpw 4533	. . . . 5 ⊢ ((𝐹‘𝑧) ∈ 𝒫 (𝐹‘𝑥) ↔ (𝐹‘𝑧) ⊆ (𝐹‘𝑥))
25		vex 3435	. . . . . . . 8 ⊢ 𝑤 ∈ V
26	5, 6, 25, 7	brpermmodel 45447	. . . . . . 7 ⊢ (𝑤𝑅𝑧 ↔ 𝑤 ∈ (𝐹‘𝑧))
27		vex 3435	. . . . . . . 8 ⊢ 𝑥 ∈ V
28	5, 6, 25, 27	brpermmodel 45447	. . . . . . 7 ⊢ (𝑤𝑅𝑥 ↔ 𝑤 ∈ (𝐹‘𝑥))
29	26, 28	imbi12i 351	. . . . . 6 ⊢ ((𝑤𝑅𝑧 → 𝑤𝑅𝑥) ↔ (𝑤 ∈ (𝐹‘𝑧) → 𝑤 ∈ (𝐹‘𝑥)))
30	29	albii 1826	. . . . 5 ⊢ (∀𝑤(𝑤𝑅𝑧 → 𝑤𝑅𝑥) ↔ ∀𝑤(𝑤 ∈ (𝐹‘𝑧) → 𝑤 ∈ (𝐹‘𝑥)))
31	22, 24, 30	3bitr4i 304	. . . 4 ⊢ ((𝐹‘𝑧) ∈ 𝒫 (𝐹‘𝑥) ↔ ∀𝑤(𝑤𝑅𝑧 → 𝑤𝑅𝑥))
32	21, 31	sylbbr 237	. . 3 ⊢ (∀𝑤(𝑤𝑅𝑧 → 𝑤𝑅𝑥) → 𝑧𝑅(◡𝐹‘(◡𝐹 “ 𝒫 (𝐹‘𝑥))))
33	32	ax-gen 1802	. 2 ⊢ ∀𝑧(∀𝑤(𝑤𝑅𝑧 → 𝑤𝑅𝑥) → 𝑧𝑅(◡𝐹‘(◡𝐹 “ 𝒫 (𝐹‘𝑥))))
34	1, 4, 33	ceqsexv2d 3480	1 ⊢ ∃𝑦∀𝑧(∀𝑤(𝑤𝑅𝑧 → 𝑤𝑅𝑥) → 𝑧𝑅𝑦)

Syntax hints:   → wi 4   ↔ wb 207   ∧ wa 396  ∀wal 1545   = wceq 1547  ∃wex 1786   ∈ wcel 2119  Vcvv 3431   ⊆ wss 3883  𝒫 cpw 4529   class class class wbr 5072   E cep 5517  ^◡ccnv 5617   “ cima 5621   ∘ ccom 5622  Fun wfun 6479   Fn wfn 6480  –onto→wfo 6483  –1-1-onto→wf1o 6484  ‘cfv 6485

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1974  ax-7 2015  ax-8 2121  ax-9 2129  ax-10 2152  ax-11 2168  ax-12 2189  ax-ext 2711  ax-rep 5199  ax-sep 5218  ax-nul 5228  ax-pow 5294  ax-pr 5362

This theorem depends on definitions:  df-bi 208  df-an 397  df-or 854  df-3an 1094  df-tru 1550  df-fal 1560  df-ex 1787  df-nf 1791  df-sb 2074  df-mo 2543  df-eu 2573  df-clab 2718  df-cleq 2731  df-clel 2814  df-ne 2935  df-ral 3054  df-rex 3064  df-rab 3392  df-v 3433  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-nul 4262  df-if 4455  df-pw 4531  df-sn 4556  df-pr 4558  df-op 4562  df-uni 4839  df-br 5073  df-opab 5135  df-id 5513  df-eprel 5518  df-xp 5624  df-rel 5625  df-cnv 5626  df-co 5627  df-dm 5628  df-rn 5629  df-res 5630  df-ima 5631  df-iota 6441  df-fun 6487  df-fn 6488  df-f 6489  df-f1 6490  df-fo 6491  df-f1o 6492  df-fv 6493

This theorem is referenced by: (None)