Theorem nnoeomeqom 41833

Description: Any natural number at least as large as two raised to the power of omega is omega. Lemma 3.25 of [Schloeder] p. 11. (Contributed by RP, 30-Jan-2025.)

Assertion

Ref	Expression
nnoeomeqom	⊢ ((𝐴 ∈ ω ∧ 1o ∈ 𝐴) → (𝐴 ↑o ω) = ω)

Proof of Theorem nnoeomeqom

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

Step	Hyp	Ref	Expression
1		simpl 483	. . . 4 ⊢ ((𝐴 ∈ ω ∧ 1o ∈ 𝐴) → 𝐴 ∈ ω)
2		nnon 7844	. . . 4 ⊢ (𝐴 ∈ ω → 𝐴 ∈ On)
3	1, 2	syl 17	. . 3 ⊢ ((𝐴 ∈ ω ∧ 1o ∈ 𝐴) → 𝐴 ∈ On)
4		omelon 9623	. . . . 5 ⊢ ω ∈ On
5		limom 7854	. . . . 5 ⊢ Lim ω
6	4, 5	pm3.2i 471	. . . 4 ⊢ (ω ∈ On ∧ Lim ω)
7	6	a1i 11	. . 3 ⊢ ((𝐴 ∈ ω ∧ 1o ∈ 𝐴) → (ω ∈ On ∧ Lim ω))
8		0elon 6407	. . . . 5 ⊢ ∅ ∈ On
9	8	a1i 11	. . . 4 ⊢ ((𝐴 ∈ ω ∧ 1o ∈ 𝐴) → ∅ ∈ On)
10		0ss 4392	. . . . 5 ⊢ ∅ ⊆ 1o
11	10	a1i 11	. . . 4 ⊢ ((𝐴 ∈ ω ∧ 1o ∈ 𝐴) → ∅ ⊆ 1o)
12		simpr 485	. . . 4 ⊢ ((𝐴 ∈ ω ∧ 1o ∈ 𝐴) → 1o ∈ 𝐴)
13		ontr2 6400	. . . . 5 ⊢ ((∅ ∈ On ∧ 𝐴 ∈ On) → ((∅ ⊆ 1o ∧ 1o ∈ 𝐴) → ∅ ∈ 𝐴))
14	13	imp 407	. . . 4 ⊢ (((∅ ∈ On ∧ 𝐴 ∈ On) ∧ (∅ ⊆ 1o ∧ 1o ∈ 𝐴)) → ∅ ∈ 𝐴)
15	9, 3, 11, 12, 14	syl22anc 837	. . 3 ⊢ ((𝐴 ∈ ω ∧ 1o ∈ 𝐴) → ∅ ∈ 𝐴)
16		oelim 8516	. . 3 ⊢ (((𝐴 ∈ On ∧ (ω ∈ On ∧ Lim ω)) ∧ ∅ ∈ 𝐴) → (𝐴 ↑o ω) = ∪ 𝑥 ∈ ω (𝐴 ↑o 𝑥))
17	3, 7, 15, 16	syl21anc 836	. 2 ⊢ ((𝐴 ∈ ω ∧ 1o ∈ 𝐴) → (𝐴 ↑o ω) = ∪ 𝑥 ∈ ω (𝐴 ↑o 𝑥))
18		ovex 7426	. . . 4 ⊢ (𝐴 ↑o 𝑥) ∈ V
19	18	dfiun2 5029	. . 3 ⊢ ∪ 𝑥 ∈ ω (𝐴 ↑o 𝑥) = ∪ {𝑦 ∣ ∃𝑥 ∈ ω 𝑦 = (𝐴 ↑o 𝑥)}
20		eluniab 4916	. . . . . 6 ⊢ (𝑧 ∈ ∪ {𝑦 ∣ ∃𝑥 ∈ ω 𝑦 = (𝐴 ↑o 𝑥)} ↔ ∃𝑦(𝑧 ∈ 𝑦 ∧ ∃𝑥 ∈ ω 𝑦 = (𝐴 ↑o 𝑥)))
21		19.42v 1957	. . . . . . . 8 ⊢ (∃𝑥(𝑧 ∈ 𝑦 ∧ (𝑥 ∈ ω ∧ 𝑦 = (𝐴 ↑o 𝑥))) ↔ (𝑧 ∈ 𝑦 ∧ ∃𝑥(𝑥 ∈ ω ∧ 𝑦 = (𝐴 ↑o 𝑥))))
22		3anass 1095	. . . . . . . . 9 ⊢ ((𝑧 ∈ 𝑦 ∧ 𝑥 ∈ ω ∧ 𝑦 = (𝐴 ↑o 𝑥)) ↔ (𝑧 ∈ 𝑦 ∧ (𝑥 ∈ ω ∧ 𝑦 = (𝐴 ↑o 𝑥))))
23	22	exbii 1850	. . . . . . . 8 ⊢ (∃𝑥(𝑧 ∈ 𝑦 ∧ 𝑥 ∈ ω ∧ 𝑦 = (𝐴 ↑o 𝑥)) ↔ ∃𝑥(𝑧 ∈ 𝑦 ∧ (𝑥 ∈ ω ∧ 𝑦 = (𝐴 ↑o 𝑥))))
24		df-rex 3070	. . . . . . . . 9 ⊢ (∃𝑥 ∈ ω 𝑦 = (𝐴 ↑o 𝑥) ↔ ∃𝑥(𝑥 ∈ ω ∧ 𝑦 = (𝐴 ↑o 𝑥)))
25	24	anbi2i 623	. . . . . . . 8 ⊢ ((𝑧 ∈ 𝑦 ∧ ∃𝑥 ∈ ω 𝑦 = (𝐴 ↑o 𝑥)) ↔ (𝑧 ∈ 𝑦 ∧ ∃𝑥(𝑥 ∈ ω ∧ 𝑦 = (𝐴 ↑o 𝑥))))
26	21, 23, 25	3bitr4ri 303	. . . . . . 7 ⊢ ((𝑧 ∈ 𝑦 ∧ ∃𝑥 ∈ ω 𝑦 = (𝐴 ↑o 𝑥)) ↔ ∃𝑥(𝑧 ∈ 𝑦 ∧ 𝑥 ∈ ω ∧ 𝑦 = (𝐴 ↑o 𝑥)))
27	26	exbii 1850	. . . . . 6 ⊢ (∃𝑦(𝑧 ∈ 𝑦 ∧ ∃𝑥 ∈ ω 𝑦 = (𝐴 ↑o 𝑥)) ↔ ∃𝑦∃𝑥(𝑧 ∈ 𝑦 ∧ 𝑥 ∈ ω ∧ 𝑦 = (𝐴 ↑o 𝑥)))
28		excom 2162	. . . . . 6 ⊢ (∃𝑦∃𝑥(𝑧 ∈ 𝑦 ∧ 𝑥 ∈ ω ∧ 𝑦 = (𝐴 ↑o 𝑥)) ↔ ∃𝑥∃𝑦(𝑧 ∈ 𝑦 ∧ 𝑥 ∈ ω ∧ 𝑦 = (𝐴 ↑o 𝑥)))
29	20, 27, 28	3bitri 296	. . . . 5 ⊢ (𝑧 ∈ ∪ {𝑦 ∣ ∃𝑥 ∈ ω 𝑦 = (𝐴 ↑o 𝑥)} ↔ ∃𝑥∃𝑦(𝑧 ∈ 𝑦 ∧ 𝑥 ∈ ω ∧ 𝑦 = (𝐴 ↑o 𝑥)))
30		simpr3 1196	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ω ∧ 1o ∈ 𝐴) ∧ (𝑧 ∈ 𝑦 ∧ 𝑥 ∈ ω ∧ 𝑦 = (𝐴 ↑o 𝑥))) → 𝑦 = (𝐴 ↑o 𝑥))
31		simp2 1137	. . . . . . . . . . . 12 ⊢ ((𝑧 ∈ 𝑦 ∧ 𝑥 ∈ ω ∧ 𝑦 = (𝐴 ↑o 𝑥)) → 𝑥 ∈ ω)
32		nnecl 8596	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ω ∧ 𝑥 ∈ ω) → (𝐴 ↑o 𝑥) ∈ ω)
33	1, 31, 32	syl2an 596	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ ω ∧ 1o ∈ 𝐴) ∧ (𝑧 ∈ 𝑦 ∧ 𝑥 ∈ ω ∧ 𝑦 = (𝐴 ↑o 𝑥))) → (𝐴 ↑o 𝑥) ∈ ω)
34		onelss 6395	. . . . . . . . . . 11 ⊢ (ω ∈ On → ((𝐴 ↑o 𝑥) ∈ ω → (𝐴 ↑o 𝑥) ⊆ ω))
35	4, 33, 34	mpsyl 68	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ω ∧ 1o ∈ 𝐴) ∧ (𝑧 ∈ 𝑦 ∧ 𝑥 ∈ ω ∧ 𝑦 = (𝐴 ↑o 𝑥))) → (𝐴 ↑o 𝑥) ⊆ ω)
36	30, 35	eqsstrd 4016	. . . . . . . . 9 ⊢ (((𝐴 ∈ ω ∧ 1o ∈ 𝐴) ∧ (𝑧 ∈ 𝑦 ∧ 𝑥 ∈ ω ∧ 𝑦 = (𝐴 ↑o 𝑥))) → 𝑦 ⊆ ω)
37		simpr1 1194	. . . . . . . . 9 ⊢ (((𝐴 ∈ ω ∧ 1o ∈ 𝐴) ∧ (𝑧 ∈ 𝑦 ∧ 𝑥 ∈ ω ∧ 𝑦 = (𝐴 ↑o 𝑥))) → 𝑧 ∈ 𝑦)
38	36, 37	sseldd 3979	. . . . . . . 8 ⊢ (((𝐴 ∈ ω ∧ 1o ∈ 𝐴) ∧ (𝑧 ∈ 𝑦 ∧ 𝑥 ∈ ω ∧ 𝑦 = (𝐴 ↑o 𝑥))) → 𝑧 ∈ ω)
39	38	ex 413	. . . . . . 7 ⊢ ((𝐴 ∈ ω ∧ 1o ∈ 𝐴) → ((𝑧 ∈ 𝑦 ∧ 𝑥 ∈ ω ∧ 𝑦 = (𝐴 ↑o 𝑥)) → 𝑧 ∈ ω))
40	39	exlimdvv 1937	. . . . . 6 ⊢ ((𝐴 ∈ ω ∧ 1o ∈ 𝐴) → (∃𝑥∃𝑦(𝑧 ∈ 𝑦 ∧ 𝑥 ∈ ω ∧ 𝑦 = (𝐴 ↑o 𝑥)) → 𝑧 ∈ ω))
41		peano2 7863	. . . . . . . . 9 ⊢ (𝑧 ∈ ω → suc 𝑧 ∈ ω)
42	41	adantl 482	. . . . . . . 8 ⊢ (((𝐴 ∈ ω ∧ 1o ∈ 𝐴) ∧ 𝑧 ∈ ω) → suc 𝑧 ∈ ω)
43		ovex 7426	. . . . . . . . . 10 ⊢ (𝐴 ↑o suc 𝑧) ∈ V
44	43	a1i 11	. . . . . . . . 9 ⊢ (((𝐴 ∈ ω ∧ 1o ∈ 𝐴) ∧ 𝑧 ∈ ω) → (𝐴 ↑o suc 𝑧) ∈ V)
45	2	anim1i 615	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ω ∧ 1o ∈ 𝐴) → (𝐴 ∈ On ∧ 1o ∈ 𝐴))
46		ondif2 8484	. . . . . . . . . . . . 13 ⊢ (𝐴 ∈ (On ∖ 2o) ↔ (𝐴 ∈ On ∧ 1o ∈ 𝐴))
47	45, 46	sylibr 233	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ω ∧ 1o ∈ 𝐴) → 𝐴 ∈ (On ∖ 2o))
48		nnon 7844	. . . . . . . . . . . . 13 ⊢ (suc 𝑧 ∈ ω → suc 𝑧 ∈ On)
49	41, 48	syl 17	. . . . . . . . . . . 12 ⊢ (𝑧 ∈ ω → suc 𝑧 ∈ On)
50		oeworde 8576	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ (On ∖ 2o) ∧ suc 𝑧 ∈ On) → suc 𝑧 ⊆ (𝐴 ↑o suc 𝑧))
51	47, 49, 50	syl2an 596	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ ω ∧ 1o ∈ 𝐴) ∧ 𝑧 ∈ ω) → suc 𝑧 ⊆ (𝐴 ↑o suc 𝑧))
52		vex 3477	. . . . . . . . . . . . 13 ⊢ 𝑧 ∈ V
53	52	sucid 6435	. . . . . . . . . . . 12 ⊢ 𝑧 ∈ suc 𝑧
54	53	a1i 11	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ ω ∧ 1o ∈ 𝐴) ∧ 𝑧 ∈ ω) → 𝑧 ∈ suc 𝑧)
55	51, 54	sseldd 3979	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ω ∧ 1o ∈ 𝐴) ∧ 𝑧 ∈ ω) → 𝑧 ∈ (𝐴 ↑o suc 𝑧))
56		eqidd 2732	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ω ∧ 1o ∈ 𝐴) ∧ 𝑧 ∈ ω) → (𝐴 ↑o suc 𝑧) = (𝐴 ↑o suc 𝑧))
57	55, 42, 56	3jca 1128	. . . . . . . . 9 ⊢ (((𝐴 ∈ ω ∧ 1o ∈ 𝐴) ∧ 𝑧 ∈ ω) → (𝑧 ∈ (𝐴 ↑o suc 𝑧) ∧ suc 𝑧 ∈ ω ∧ (𝐴 ↑o suc 𝑧) = (𝐴 ↑o suc 𝑧)))
58		eleq2 2821	. . . . . . . . . 10 ⊢ (𝑦 = (𝐴 ↑o suc 𝑧) → (𝑧 ∈ 𝑦 ↔ 𝑧 ∈ (𝐴 ↑o suc 𝑧)))
59		eqeq1 2735	. . . . . . . . . 10 ⊢ (𝑦 = (𝐴 ↑o suc 𝑧) → (𝑦 = (𝐴 ↑o suc 𝑧) ↔ (𝐴 ↑o suc 𝑧) = (𝐴 ↑o suc 𝑧)))
60	58, 59	3anbi13d 1438	. . . . . . . . 9 ⊢ (𝑦 = (𝐴 ↑o suc 𝑧) → ((𝑧 ∈ 𝑦 ∧ suc 𝑧 ∈ ω ∧ 𝑦 = (𝐴 ↑o suc 𝑧)) ↔ (𝑧 ∈ (𝐴 ↑o suc 𝑧) ∧ suc 𝑧 ∈ ω ∧ (𝐴 ↑o suc 𝑧) = (𝐴 ↑o suc 𝑧))))
61	44, 57, 60	spcedv 3585	. . . . . . . 8 ⊢ (((𝐴 ∈ ω ∧ 1o ∈ 𝐴) ∧ 𝑧 ∈ ω) → ∃𝑦(𝑧 ∈ 𝑦 ∧ suc 𝑧 ∈ ω ∧ 𝑦 = (𝐴 ↑o suc 𝑧)))
62		eleq1 2820	. . . . . . . . . 10 ⊢ (𝑥 = suc 𝑧 → (𝑥 ∈ ω ↔ suc 𝑧 ∈ ω))
63		oveq2 7401	. . . . . . . . . . 11 ⊢ (𝑥 = suc 𝑧 → (𝐴 ↑o 𝑥) = (𝐴 ↑o suc 𝑧))
64	63	eqeq2d 2742	. . . . . . . . . 10 ⊢ (𝑥 = suc 𝑧 → (𝑦 = (𝐴 ↑o 𝑥) ↔ 𝑦 = (𝐴 ↑o suc 𝑧)))
65	62, 64	3anbi23d 1439	. . . . . . . . 9 ⊢ (𝑥 = suc 𝑧 → ((𝑧 ∈ 𝑦 ∧ 𝑥 ∈ ω ∧ 𝑦 = (𝐴 ↑o 𝑥)) ↔ (𝑧 ∈ 𝑦 ∧ suc 𝑧 ∈ ω ∧ 𝑦 = (𝐴 ↑o suc 𝑧))))
66	65	exbidv 1924	. . . . . . . 8 ⊢ (𝑥 = suc 𝑧 → (∃𝑦(𝑧 ∈ 𝑦 ∧ 𝑥 ∈ ω ∧ 𝑦 = (𝐴 ↑o 𝑥)) ↔ ∃𝑦(𝑧 ∈ 𝑦 ∧ suc 𝑧 ∈ ω ∧ 𝑦 = (𝐴 ↑o suc 𝑧))))
67	42, 61, 66	spcedv 3585	. . . . . . 7 ⊢ (((𝐴 ∈ ω ∧ 1o ∈ 𝐴) ∧ 𝑧 ∈ ω) → ∃𝑥∃𝑦(𝑧 ∈ 𝑦 ∧ 𝑥 ∈ ω ∧ 𝑦 = (𝐴 ↑o 𝑥)))
68	67	ex 413	. . . . . 6 ⊢ ((𝐴 ∈ ω ∧ 1o ∈ 𝐴) → (𝑧 ∈ ω → ∃𝑥∃𝑦(𝑧 ∈ 𝑦 ∧ 𝑥 ∈ ω ∧ 𝑦 = (𝐴 ↑o 𝑥))))
69	40, 68	impbid 211	. . . . 5 ⊢ ((𝐴 ∈ ω ∧ 1o ∈ 𝐴) → (∃𝑥∃𝑦(𝑧 ∈ 𝑦 ∧ 𝑥 ∈ ω ∧ 𝑦 = (𝐴 ↑o 𝑥)) ↔ 𝑧 ∈ ω))
70	29, 69	bitrid 282	. . . 4 ⊢ ((𝐴 ∈ ω ∧ 1o ∈ 𝐴) → (𝑧 ∈ ∪ {𝑦 ∣ ∃𝑥 ∈ ω 𝑦 = (𝐴 ↑o 𝑥)} ↔ 𝑧 ∈ ω))
71	70	eqrdv 2729	. . 3 ⊢ ((𝐴 ∈ ω ∧ 1o ∈ 𝐴) → ∪ {𝑦 ∣ ∃𝑥 ∈ ω 𝑦 = (𝐴 ↑o 𝑥)} = ω)
72	19, 71	eqtrid 2783	. 2 ⊢ ((𝐴 ∈ ω ∧ 1o ∈ 𝐴) → ∪ 𝑥 ∈ ω (𝐴 ↑o 𝑥) = ω)
73	17, 72	eqtrd 2771	1 ⊢ ((𝐴 ∈ ω ∧ 1o ∈ 𝐴) → (𝐴 ↑o ω) = ω)

Syntax hints:   → wi 4   ∧ wa 396   ∧ w3a 1087   = wceq 1541  ∃wex 1781   ∈ wcel 2106  {cab 2708  ∃wrex 3069  Vcvv 3473   ∖ cdif 3941   ⊆ wss 3944  ∅c0 4318  ∪ cuni 4901  ∪ ciun 4990  Oncon0 6353  Lim wlim 6354  suc csuc 6355  (class class class)co 7393  ωcom 7838  1_oc1o 8441  2_oc2o 8442   ↑_o coe 8447

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2702  ax-rep 5278  ax-sep 5292  ax-nul 5299  ax-pr 5420  ax-un 7708  ax-inf2 9618

This theorem depends on definitions:  df-bi 206  df-an 397  df-or 846  df-3or 1088  df-3an 1089  df-tru 1544  df-fal 1554  df-ex 1782  df-nf 1786  df-sb 2068  df-mo 2533  df-eu 2562  df-clab 2709  df-cleq 2723  df-clel 2809  df-nfc 2884  df-ne 2940  df-ral 3061  df-rex 3070  df-reu 3376  df-rab 3432  df-v 3475  df-sbc 3774  df-csb 3890  df-dif 3947  df-un 3949  df-in 3951  df-ss 3961  df-pss 3963  df-nul 4319  df-if 4523  df-pw 4598  df-sn 4623  df-pr 4625  df-op 4629  df-uni 4902  df-iun 4992  df-br 5142  df-opab 5204  df-mpt 5225  df-tr 5259  df-id 5567  df-eprel 5573  df-po 5581  df-so 5582  df-fr 5624  df-we 5626  df-xp 5675  df-rel 5676  df-cnv 5677  df-co 5678  df-dm 5679  df-rn 5680  df-res 5681  df-ima 5682  df-pred 6289  df-ord 6356  df-on 6357  df-lim 6358  df-suc 6359  df-iota 6484  df-fun 6534  df-fn 6535  df-f 6536  df-f1 6537  df-fo 6538  df-f1o 6539  df-fv 6540  df-ov 7396  df-oprab 7397  df-mpo 7398  df-om 7839  df-2nd 7958  df-frecs 8248  df-wrecs 8279  df-recs 8353  df-rdg 8392  df-1o 8448  df-2o 8449  df-oadd 8452  df-omul 8453  df-oexp 8454

This theorem is referenced by:  oenord1ex  41836  oaomoencom  41838