Theorem dflim5 43291

Description: A limit ordinal is either the proper class of ordinals or some nonzero product with omega. (Contributed by RP, 8-Jan-2025.)

Assertion

Ref	Expression
dflim5	⊢ (Lim 𝐴 ↔ (𝐴 = On ∨ ∃𝑥 ∈ (On ∖ 1o)𝐴 = (ω ·o 𝑥)))

Distinct variable group:   𝑥,𝐴

Proof of Theorem dflim5

Dummy variable 𝑦 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		limord 6455	. . . . 5 ⊢ (Lim 𝐴 → Ord 𝐴)
2		ordeleqon 7817	. . . . . . 7 ⊢ (Ord 𝐴 ↔ (𝐴 ∈ On ∨ 𝐴 = On))
3	2	biimpi 216	. . . . . 6 ⊢ (Ord 𝐴 → (𝐴 ∈ On ∨ 𝐴 = On))
4	3	orcomd 870	. . . . 5 ⊢ (Ord 𝐴 → (𝐴 = On ∨ 𝐴 ∈ On))
5	1, 4	syl 17	. . . 4 ⊢ (Lim 𝐴 → (𝐴 = On ∨ 𝐴 ∈ On))
6	5	pm4.71ri 560	. . 3 ⊢ (Lim 𝐴 ↔ ((𝐴 = On ∨ 𝐴 ∈ On) ∧ Lim 𝐴))
7		andir 1009	. . 3 ⊢ (((𝐴 = On ∨ 𝐴 ∈ On) ∧ Lim 𝐴) ↔ ((𝐴 = On ∧ Lim 𝐴) ∨ (𝐴 ∈ On ∧ Lim 𝐴)))
8	6, 7	bitri 275	. 2 ⊢ (Lim 𝐴 ↔ ((𝐴 = On ∧ Lim 𝐴) ∨ (𝐴 ∈ On ∧ Lim 𝐴)))
9		limon 7872	. . . . 5 ⊢ Lim On
10		limeq 6407	. . . . 5 ⊢ (𝐴 = On → (Lim 𝐴 ↔ Lim On))
11	9, 10	mpbiri 258	. . . 4 ⊢ (𝐴 = On → Lim 𝐴)
12	11	pm4.71i 559	. . 3 ⊢ (𝐴 = On ↔ (𝐴 = On ∧ Lim 𝐴))
13	12	orbi1i 912	. 2 ⊢ ((𝐴 = On ∨ (𝐴 ∈ On ∧ Lim 𝐴)) ↔ ((𝐴 = On ∧ Lim 𝐴) ∨ (𝐴 ∈ On ∧ Lim 𝐴)))
14		simpl 482	. . . . . 6 ⊢ ((𝐴 ∈ On ∧ Lim 𝐴) → 𝐴 ∈ On)
15		omelon 9715	. . . . . . . 8 ⊢ ω ∈ On
16	15	a1i 11	. . . . . . 7 ⊢ (𝐴 ∈ On → ω ∈ On)
17		id 22	. . . . . . 7 ⊢ (𝐴 ∈ On → 𝐴 ∈ On)
18		peano1 7927	. . . . . . . . 9 ⊢ ∅ ∈ ω
19	18	ne0ii 4367	. . . . . . . 8 ⊢ ω ≠ ∅
20	19	a1i 11	. . . . . . 7 ⊢ (𝐴 ∈ On → ω ≠ ∅)
21	16, 17, 20	3jca 1128	. . . . . 6 ⊢ (𝐴 ∈ On → (ω ∈ On ∧ 𝐴 ∈ On ∧ ω ≠ ∅))
22		omeulem1 8638	. . . . . 6 ⊢ ((ω ∈ On ∧ 𝐴 ∈ On ∧ ω ≠ ∅) → ∃𝑥 ∈ On ∃𝑦 ∈ ω ((ω ·o 𝑥) +o 𝑦) = 𝐴)
23	14, 21, 22	3syl 18	. . . . 5 ⊢ ((𝐴 ∈ On ∧ Lim 𝐴) → ∃𝑥 ∈ On ∃𝑦 ∈ ω ((ω ·o 𝑥) +o 𝑦) = 𝐴)
24		limeq 6407	. . . . . . . . . . . . . . . 16 ⊢ (((ω ·o 𝑥) +o 𝑦) = 𝐴 → (Lim ((ω ·o 𝑥) +o 𝑦) ↔ Lim 𝐴))
25	24	biimprd 248	. . . . . . . . . . . . . . 15 ⊢ (((ω ·o 𝑥) +o 𝑦) = 𝐴 → (Lim 𝐴 → Lim ((ω ·o 𝑥) +o 𝑦)))
26		simplr 768	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((𝑥 ∈ On ∧ 𝑦 ∈ ω) ∧ ¬ ∅ ∈ 𝑥) → 𝑦 ∈ ω)
27		nnlim 7917	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑦 ∈ ω → ¬ Lim 𝑦)
28	26, 27	syl 17	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑥 ∈ On ∧ 𝑦 ∈ ω) ∧ ¬ ∅ ∈ 𝑥) → ¬ Lim 𝑦)
29		on0eln0 6451	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ (𝑥 ∈ On → (∅ ∈ 𝑥 ↔ 𝑥 ≠ ∅))
30	29	biimprd 248	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (𝑥 ∈ On → (𝑥 ≠ ∅ → ∅ ∈ 𝑥))
31	30	necon1bd 2964	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (𝑥 ∈ On → (¬ ∅ ∈ 𝑥 → 𝑥 = ∅))
32	31	adantr 480	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ ((𝑥 ∈ On ∧ 𝑦 ∈ ω) → (¬ ∅ ∈ 𝑥 → 𝑥 = ∅))
33	32	imp 406	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (((𝑥 ∈ On ∧ 𝑦 ∈ ω) ∧ ¬ ∅ ∈ 𝑥) → 𝑥 = ∅)
34	33, 26	jca 511	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((𝑥 ∈ On ∧ 𝑦 ∈ ω) ∧ ¬ ∅ ∈ 𝑥) → (𝑥 = ∅ ∧ 𝑦 ∈ ω))
35		simpl 482	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ ((𝑥 = ∅ ∧ 𝑦 ∈ ω) → 𝑥 = ∅)
36	35	oveq2d 7464	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ ((𝑥 = ∅ ∧ 𝑦 ∈ ω) → (ω ·o 𝑥) = (ω ·o ∅))
37		om0 8573	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (ω ∈ On → (ω ·o ∅) = ∅)
38	15, 37	mp1i 13	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ ((𝑥 = ∅ ∧ 𝑦 ∈ ω) → (ω ·o ∅) = ∅)
39	36, 38	eqtrd 2780	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ ((𝑥 = ∅ ∧ 𝑦 ∈ ω) → (ω ·o 𝑥) = ∅)
40	39	oveq1d 7463	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ ((𝑥 = ∅ ∧ 𝑦 ∈ ω) → ((ω ·o 𝑥) +o 𝑦) = (∅ +o 𝑦))
41		nna0r 8665	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (𝑦 ∈ ω → (∅ +o 𝑦) = 𝑦)
42	41	adantl 481	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ ((𝑥 = ∅ ∧ 𝑦 ∈ ω) → (∅ +o 𝑦) = 𝑦)
43	40, 42	eqtrd 2780	. . . . . . . . . . . . . . . . . . . . 21 ⊢ ((𝑥 = ∅ ∧ 𝑦 ∈ ω) → ((ω ·o 𝑥) +o 𝑦) = 𝑦)
44		limeq 6407	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((ω ·o 𝑥) +o 𝑦) = 𝑦 → (Lim ((ω ·o 𝑥) +o 𝑦) ↔ Lim 𝑦))
45	34, 43, 44	3syl 18	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑥 ∈ On ∧ 𝑦 ∈ ω) ∧ ¬ ∅ ∈ 𝑥) → (Lim ((ω ·o 𝑥) +o 𝑦) ↔ Lim 𝑦))
46	28, 45	mtbird 325	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑥 ∈ On ∧ 𝑦 ∈ ω) ∧ ¬ ∅ ∈ 𝑥) → ¬ Lim ((ω ·o 𝑥) +o 𝑦))
47	46	ex 412	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑥 ∈ On ∧ 𝑦 ∈ ω) → (¬ ∅ ∈ 𝑥 → ¬ Lim ((ω ·o 𝑥) +o 𝑦)))
48		ovex 7481	. . . . . . . . . . . . . . . . . . . . 21 ⊢ ((ω ·o 𝑥) +o ∪ 𝑦) ∈ V
49		nlimsucg 7879	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((ω ·o 𝑥) +o ∪ 𝑦) ∈ V → ¬ Lim suc ((ω ·o 𝑥) +o ∪ 𝑦))
50	48, 49	mp1i 13	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑥 ∈ On ∧ 𝑦 ∈ ω) ∧ ¬ 𝑦 = ∅) → ¬ Lim suc ((ω ·o 𝑥) +o ∪ 𝑦))
51		nnord 7911	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ⊢ (𝑦 ∈ ω → Ord 𝑦)
52		orduniorsuc 7866	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ⊢ (Ord 𝑦 → (𝑦 = ∪ 𝑦 ∨ 𝑦 = suc ∪ 𝑦))
53	51, 52	syl 17	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ (𝑦 ∈ ω → (𝑦 = ∪ 𝑦 ∨ 𝑦 = suc ∪ 𝑦))
54		3ianor 1107	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 ⊢ (¬ (Ord 𝑦 ∧ 𝑦 ≠ ∅ ∧ 𝑦 = ∪ 𝑦) ↔ (¬ Ord 𝑦 ∨ ¬ 𝑦 ≠ ∅ ∨ ¬ 𝑦 = ∪ 𝑦))
55		df-lim 6400	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 ⊢ (Lim 𝑦 ↔ (Ord 𝑦 ∧ 𝑦 ≠ ∅ ∧ 𝑦 = ∪ 𝑦))
56	54, 55	xchnxbir 333	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 ⊢ (¬ Lim 𝑦 ↔ (¬ Ord 𝑦 ∨ ¬ 𝑦 ≠ ∅ ∨ ¬ 𝑦 = ∪ 𝑦))
57	27, 56	sylib 218	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ⊢ (𝑦 ∈ ω → (¬ Ord 𝑦 ∨ ¬ 𝑦 ≠ ∅ ∨ ¬ 𝑦 = ∪ 𝑦))
58	51	pm2.24d 151	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 ⊢ (𝑦 ∈ ω → (¬ Ord 𝑦 → (𝑦 = ∪ 𝑦 → 𝑦 = ∅)))
59		nne 2950	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 ⊢ (¬ 𝑦 ≠ ∅ ↔ 𝑦 = ∅)
60	59	biimpi 216	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 ⊢ (¬ 𝑦 ≠ ∅ → 𝑦 = ∅)
61	60	a1i13 27	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 ⊢ (𝑦 ∈ ω → (¬ 𝑦 ≠ ∅ → (𝑦 = ∪ 𝑦 → 𝑦 = ∅)))
62		pm2.21 123	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 ⊢ (¬ 𝑦 = ∪ 𝑦 → (𝑦 = ∪ 𝑦 → 𝑦 = ∅))
63	62	a1i 11	. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 ⊢ (𝑦 ∈ ω → (¬ 𝑦 = ∪ 𝑦 → (𝑦 = ∪ 𝑦 → 𝑦 = ∅)))
64	58, 61, 63	3jaod 1429	. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ⊢ (𝑦 ∈ ω → ((¬ Ord 𝑦 ∨ ¬ 𝑦 ≠ ∅ ∨ ¬ 𝑦 = ∪ 𝑦) → (𝑦 = ∪ 𝑦 → 𝑦 = ∅)))
65	57, 64	mpd 15	. . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ⊢ (𝑦 ∈ ω → (𝑦 = ∪ 𝑦 → 𝑦 = ∅))
66	65	orim1d 966	. . . . . . . . . . . . . . . . . . . . . . . . . . 27 ⊢ (𝑦 ∈ ω → ((𝑦 = ∪ 𝑦 ∨ 𝑦 = suc ∪ 𝑦) → (𝑦 = ∅ ∨ 𝑦 = suc ∪ 𝑦)))
67	53, 66	mpd 15	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ (𝑦 ∈ ω → (𝑦 = ∅ ∨ 𝑦 = suc ∪ 𝑦))
68	67	ord 863	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (𝑦 ∈ ω → (¬ 𝑦 = ∅ → 𝑦 = suc ∪ 𝑦))
69	68	adantl 481	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ ((𝑥 ∈ On ∧ 𝑦 ∈ ω) → (¬ 𝑦 = ∅ → 𝑦 = suc ∪ 𝑦))
70	69	imp 406	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (((𝑥 ∈ On ∧ 𝑦 ∈ ω) ∧ ¬ 𝑦 = ∅) → 𝑦 = suc ∪ 𝑦)
71	70	oveq2d 7464	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (((𝑥 ∈ On ∧ 𝑦 ∈ ω) ∧ ¬ 𝑦 = ∅) → ((ω ·o 𝑥) +o 𝑦) = ((ω ·o 𝑥) +o suc ∪ 𝑦))
72		simpl 482	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ ((𝑥 ∈ On ∧ 𝑦 ∈ ω) → 𝑥 ∈ On)
73	72	adantr 480	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (((𝑥 ∈ On ∧ 𝑦 ∈ ω) ∧ ¬ 𝑦 = ∅) → 𝑥 ∈ On)
74		omcl 8592	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ ((ω ∈ On ∧ 𝑥 ∈ On) → (ω ·o 𝑥) ∈ On)
75	15, 73, 74	sylancr 586	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (((𝑥 ∈ On ∧ 𝑦 ∈ ω) ∧ ¬ 𝑦 = ∅) → (ω ·o 𝑥) ∈ On)
76		nnon 7909	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ (𝑦 ∈ ω → 𝑦 ∈ On)
77		onuni 7824	. . . . . . . . . . . . . . . . . . . . . . . . . 26 ⊢ (𝑦 ∈ On → ∪ 𝑦 ∈ On)
78	76, 77	syl 17	. . . . . . . . . . . . . . . . . . . . . . . . 25 ⊢ (𝑦 ∈ ω → ∪ 𝑦 ∈ On)
79	78	adantl 481	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ ((𝑥 ∈ On ∧ 𝑦 ∈ ω) → ∪ 𝑦 ∈ On)
80	79	adantr 480	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (((𝑥 ∈ On ∧ 𝑦 ∈ ω) ∧ ¬ 𝑦 = ∅) → ∪ 𝑦 ∈ On)
81		oasuc 8580	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (((ω ·o 𝑥) ∈ On ∧ ∪ 𝑦 ∈ On) → ((ω ·o 𝑥) +o suc ∪ 𝑦) = suc ((ω ·o 𝑥) +o ∪ 𝑦))
82	75, 80, 81	syl2anc 583	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (((𝑥 ∈ On ∧ 𝑦 ∈ ω) ∧ ¬ 𝑦 = ∅) → ((ω ·o 𝑥) +o suc ∪ 𝑦) = suc ((ω ·o 𝑥) +o ∪ 𝑦))
83	71, 82	eqtrd 2780	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((𝑥 ∈ On ∧ 𝑦 ∈ ω) ∧ ¬ 𝑦 = ∅) → ((ω ·o 𝑥) +o 𝑦) = suc ((ω ·o 𝑥) +o ∪ 𝑦))
84		limeq 6407	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (((ω ·o 𝑥) +o 𝑦) = suc ((ω ·o 𝑥) +o ∪ 𝑦) → (Lim ((ω ·o 𝑥) +o 𝑦) ↔ Lim suc ((ω ·o 𝑥) +o ∪ 𝑦)))
85	83, 84	syl 17	. . . . . . . . . . . . . . . . . . . 20 ⊢ (((𝑥 ∈ On ∧ 𝑦 ∈ ω) ∧ ¬ 𝑦 = ∅) → (Lim ((ω ·o 𝑥) +o 𝑦) ↔ Lim suc ((ω ·o 𝑥) +o ∪ 𝑦)))
86	50, 85	mtbird 325	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑥 ∈ On ∧ 𝑦 ∈ ω) ∧ ¬ 𝑦 = ∅) → ¬ Lim ((ω ·o 𝑥) +o 𝑦))
87	86	ex 412	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑥 ∈ On ∧ 𝑦 ∈ ω) → (¬ 𝑦 = ∅ → ¬ Lim ((ω ·o 𝑥) +o 𝑦)))
88	47, 87	jaod 858	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑥 ∈ On ∧ 𝑦 ∈ ω) → ((¬ ∅ ∈ 𝑥 ∨ ¬ 𝑦 = ∅) → ¬ Lim ((ω ·o 𝑥) +o 𝑦)))
89	88	con2d 134	. . . . . . . . . . . . . . . 16 ⊢ ((𝑥 ∈ On ∧ 𝑦 ∈ ω) → (Lim ((ω ·o 𝑥) +o 𝑦) → ¬ (¬ ∅ ∈ 𝑥 ∨ ¬ 𝑦 = ∅)))
90		anor 983	. . . . . . . . . . . . . . . 16 ⊢ ((∅ ∈ 𝑥 ∧ 𝑦 = ∅) ↔ ¬ (¬ ∅ ∈ 𝑥 ∨ ¬ 𝑦 = ∅))
91	89, 90	imbitrrdi 252	. . . . . . . . . . . . . . 15 ⊢ ((𝑥 ∈ On ∧ 𝑦 ∈ ω) → (Lim ((ω ·o 𝑥) +o 𝑦) → (∅ ∈ 𝑥 ∧ 𝑦 = ∅)))
92	25, 91	syl9 77	. . . . . . . . . . . . . 14 ⊢ (((ω ·o 𝑥) +o 𝑦) = 𝐴 → ((𝑥 ∈ On ∧ 𝑦 ∈ ω) → (Lim 𝐴 → (∅ ∈ 𝑥 ∧ 𝑦 = ∅))))
93	92	com13 88	. . . . . . . . . . . . 13 ⊢ (Lim 𝐴 → ((𝑥 ∈ On ∧ 𝑦 ∈ ω) → (((ω ·o 𝑥) +o 𝑦) = 𝐴 → (∅ ∈ 𝑥 ∧ 𝑦 = ∅))))
94	93	adantl 481	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ On ∧ Lim 𝐴) → ((𝑥 ∈ On ∧ 𝑦 ∈ ω) → (((ω ·o 𝑥) +o 𝑦) = 𝐴 → (∅ ∈ 𝑥 ∧ 𝑦 = ∅))))
95	94	3imp 1111	. . . . . . . . . . 11 ⊢ (((𝐴 ∈ On ∧ Lim 𝐴) ∧ (𝑥 ∈ On ∧ 𝑦 ∈ ω) ∧ ((ω ·o 𝑥) +o 𝑦) = 𝐴) → (∅ ∈ 𝑥 ∧ 𝑦 = ∅))
96		simp2 1137	. . . . . . . . . . . . . . 15 ⊢ (((𝐴 ∈ On ∧ Lim 𝐴) ∧ (𝑥 ∈ On ∧ 𝑦 ∈ ω) ∧ ((ω ·o 𝑥) +o 𝑦) = 𝐴) → (𝑥 ∈ On ∧ 𝑦 ∈ ω))
97	96, 72	syl 17	. . . . . . . . . . . . . 14 ⊢ (((𝐴 ∈ On ∧ Lim 𝐴) ∧ (𝑥 ∈ On ∧ 𝑦 ∈ ω) ∧ ((ω ·o 𝑥) +o 𝑦) = 𝐴) → 𝑥 ∈ On)
98		simpl 482	. . . . . . . . . . . . . 14 ⊢ ((∅ ∈ 𝑥 ∧ 𝑦 = ∅) → ∅ ∈ 𝑥)
99	97, 98	anim12i 612	. . . . . . . . . . . . 13 ⊢ ((((𝐴 ∈ On ∧ Lim 𝐴) ∧ (𝑥 ∈ On ∧ 𝑦 ∈ ω) ∧ ((ω ·o 𝑥) +o 𝑦) = 𝐴) ∧ (∅ ∈ 𝑥 ∧ 𝑦 = ∅)) → (𝑥 ∈ On ∧ ∅ ∈ 𝑥))
100		ondif1 8557	. . . . . . . . . . . . 13 ⊢ (𝑥 ∈ (On ∖ 1o) ↔ (𝑥 ∈ On ∧ ∅ ∈ 𝑥))
101	99, 100	sylibr 234	. . . . . . . . . . . 12 ⊢ ((((𝐴 ∈ On ∧ Lim 𝐴) ∧ (𝑥 ∈ On ∧ 𝑦 ∈ ω) ∧ ((ω ·o 𝑥) +o 𝑦) = 𝐴) ∧ (∅ ∈ 𝑥 ∧ 𝑦 = ∅)) → 𝑥 ∈ (On ∖ 1o))
102		simpr 484	. . . . . . . . . . . . . . 15 ⊢ ((∅ ∈ 𝑥 ∧ 𝑦 = ∅) → 𝑦 = ∅)
103	102	oveq2d 7464	. . . . . . . . . . . . . 14 ⊢ ((∅ ∈ 𝑥 ∧ 𝑦 = ∅) → ((ω ·o 𝑥) +o 𝑦) = ((ω ·o 𝑥) +o ∅))
104	103	adantl 481	. . . . . . . . . . . . 13 ⊢ ((((𝐴 ∈ On ∧ Lim 𝐴) ∧ (𝑥 ∈ On ∧ 𝑦 ∈ ω) ∧ ((ω ·o 𝑥) +o 𝑦) = 𝐴) ∧ (∅ ∈ 𝑥 ∧ 𝑦 = ∅)) → ((ω ·o 𝑥) +o 𝑦) = ((ω ·o 𝑥) +o ∅))
105		simpl3 1193	. . . . . . . . . . . . 13 ⊢ ((((𝐴 ∈ On ∧ Lim 𝐴) ∧ (𝑥 ∈ On ∧ 𝑦 ∈ ω) ∧ ((ω ·o 𝑥) +o 𝑦) = 𝐴) ∧ (∅ ∈ 𝑥 ∧ 𝑦 = ∅)) → ((ω ·o 𝑥) +o 𝑦) = 𝐴)
106	15, 72, 74	sylancr 586	. . . . . . . . . . . . . . 15 ⊢ ((𝑥 ∈ On ∧ 𝑦 ∈ ω) → (ω ·o 𝑥) ∈ On)
107		oa0 8572	. . . . . . . . . . . . . . 15 ⊢ ((ω ·o 𝑥) ∈ On → ((ω ·o 𝑥) +o ∅) = (ω ·o 𝑥))
108	96, 106, 107	3syl 18	. . . . . . . . . . . . . 14 ⊢ (((𝐴 ∈ On ∧ Lim 𝐴) ∧ (𝑥 ∈ On ∧ 𝑦 ∈ ω) ∧ ((ω ·o 𝑥) +o 𝑦) = 𝐴) → ((ω ·o 𝑥) +o ∅) = (ω ·o 𝑥))
109	108	adantr 480	. . . . . . . . . . . . 13 ⊢ ((((𝐴 ∈ On ∧ Lim 𝐴) ∧ (𝑥 ∈ On ∧ 𝑦 ∈ ω) ∧ ((ω ·o 𝑥) +o 𝑦) = 𝐴) ∧ (∅ ∈ 𝑥 ∧ 𝑦 = ∅)) → ((ω ·o 𝑥) +o ∅) = (ω ·o 𝑥))
110	104, 105, 109	3eqtr3d 2788	. . . . . . . . . . . 12 ⊢ ((((𝐴 ∈ On ∧ Lim 𝐴) ∧ (𝑥 ∈ On ∧ 𝑦 ∈ ω) ∧ ((ω ·o 𝑥) +o 𝑦) = 𝐴) ∧ (∅ ∈ 𝑥 ∧ 𝑦 = ∅)) → 𝐴 = (ω ·o 𝑥))
111	101, 110	jca 511	. . . . . . . . . . 11 ⊢ ((((𝐴 ∈ On ∧ Lim 𝐴) ∧ (𝑥 ∈ On ∧ 𝑦 ∈ ω) ∧ ((ω ·o 𝑥) +o 𝑦) = 𝐴) ∧ (∅ ∈ 𝑥 ∧ 𝑦 = ∅)) → (𝑥 ∈ (On ∖ 1o) ∧ 𝐴 = (ω ·o 𝑥)))
112	95, 111	mpdan 686	. . . . . . . . . 10 ⊢ (((𝐴 ∈ On ∧ Lim 𝐴) ∧ (𝑥 ∈ On ∧ 𝑦 ∈ ω) ∧ ((ω ·o 𝑥) +o 𝑦) = 𝐴) → (𝑥 ∈ (On ∖ 1o) ∧ 𝐴 = (ω ·o 𝑥)))
113	112	3exp 1119	. . . . . . . . 9 ⊢ ((𝐴 ∈ On ∧ Lim 𝐴) → ((𝑥 ∈ On ∧ 𝑦 ∈ ω) → (((ω ·o 𝑥) +o 𝑦) = 𝐴 → (𝑥 ∈ (On ∖ 1o) ∧ 𝐴 = (ω ·o 𝑥)))))
114	113	expdimp 452	. . . . . . . 8 ⊢ (((𝐴 ∈ On ∧ Lim 𝐴) ∧ 𝑥 ∈ On) → (𝑦 ∈ ω → (((ω ·o 𝑥) +o 𝑦) = 𝐴 → (𝑥 ∈ (On ∖ 1o) ∧ 𝐴 = (ω ·o 𝑥)))))
115	114	rexlimdv 3159	. . . . . . 7 ⊢ (((𝐴 ∈ On ∧ Lim 𝐴) ∧ 𝑥 ∈ On) → (∃𝑦 ∈ ω ((ω ·o 𝑥) +o 𝑦) = 𝐴 → (𝑥 ∈ (On ∖ 1o) ∧ 𝐴 = (ω ·o 𝑥))))
116	115	expimpd 453	. . . . . 6 ⊢ ((𝐴 ∈ On ∧ Lim 𝐴) → ((𝑥 ∈ On ∧ ∃𝑦 ∈ ω ((ω ·o 𝑥) +o 𝑦) = 𝐴) → (𝑥 ∈ (On ∖ 1o) ∧ 𝐴 = (ω ·o 𝑥))))
117	116	reximdv2 3170	. . . . 5 ⊢ ((𝐴 ∈ On ∧ Lim 𝐴) → (∃𝑥 ∈ On ∃𝑦 ∈ ω ((ω ·o 𝑥) +o 𝑦) = 𝐴 → ∃𝑥 ∈ (On ∖ 1o)𝐴 = (ω ·o 𝑥)))
118	23, 117	mpd 15	. . . 4 ⊢ ((𝐴 ∈ On ∧ Lim 𝐴) → ∃𝑥 ∈ (On ∖ 1o)𝐴 = (ω ·o 𝑥))
119		simpr 484	. . . . . . 7 ⊢ ((𝑥 ∈ (On ∖ 1o) ∧ 𝐴 = (ω ·o 𝑥)) → 𝐴 = (ω ·o 𝑥))
120		eldifi 4154	. . . . . . . . 9 ⊢ (𝑥 ∈ (On ∖ 1o) → 𝑥 ∈ On)
121	15, 120, 74	sylancr 586	. . . . . . . 8 ⊢ (𝑥 ∈ (On ∖ 1o) → (ω ·o 𝑥) ∈ On)
122	121	adantr 480	. . . . . . 7 ⊢ ((𝑥 ∈ (On ∖ 1o) ∧ 𝐴 = (ω ·o 𝑥)) → (ω ·o 𝑥) ∈ On)
123	119, 122	eqeltrd 2844	. . . . . 6 ⊢ ((𝑥 ∈ (On ∖ 1o) ∧ 𝐴 = (ω ·o 𝑥)) → 𝐴 ∈ On)
124		limom 7919	. . . . . . . . . . 11 ⊢ Lim ω
125	15, 124	pm3.2i 470	. . . . . . . . . 10 ⊢ (ω ∈ On ∧ Lim ω)
126		omlimcl2 43203	. . . . . . . . . 10 ⊢ (((𝑥 ∈ On ∧ (ω ∈ On ∧ Lim ω)) ∧ ∅ ∈ 𝑥) → Lim (ω ·o 𝑥))
127	125, 126	mpanl2 700	. . . . . . . . 9 ⊢ ((𝑥 ∈ On ∧ ∅ ∈ 𝑥) → Lim (ω ·o 𝑥))
128	100, 127	sylbi 217	. . . . . . . 8 ⊢ (𝑥 ∈ (On ∖ 1o) → Lim (ω ·o 𝑥))
129	128	adantr 480	. . . . . . 7 ⊢ ((𝑥 ∈ (On ∖ 1o) ∧ 𝐴 = (ω ·o 𝑥)) → Lim (ω ·o 𝑥))
130		limeq 6407	. . . . . . . 8 ⊢ (𝐴 = (ω ·o 𝑥) → (Lim 𝐴 ↔ Lim (ω ·o 𝑥)))
131	130	adantl 481	. . . . . . 7 ⊢ ((𝑥 ∈ (On ∖ 1o) ∧ 𝐴 = (ω ·o 𝑥)) → (Lim 𝐴 ↔ Lim (ω ·o 𝑥)))
132	129, 131	mpbird 257	. . . . . 6 ⊢ ((𝑥 ∈ (On ∖ 1o) ∧ 𝐴 = (ω ·o 𝑥)) → Lim 𝐴)
133	123, 132	jca 511	. . . . 5 ⊢ ((𝑥 ∈ (On ∖ 1o) ∧ 𝐴 = (ω ·o 𝑥)) → (𝐴 ∈ On ∧ Lim 𝐴))
134	133	rexlimiva 3153	. . . 4 ⊢ (∃𝑥 ∈ (On ∖ 1o)𝐴 = (ω ·o 𝑥) → (𝐴 ∈ On ∧ Lim 𝐴))
135	118, 134	impbii 209	. . 3 ⊢ ((𝐴 ∈ On ∧ Lim 𝐴) ↔ ∃𝑥 ∈ (On ∖ 1o)𝐴 = (ω ·o 𝑥))
136	135	orbi2i 911	. 2 ⊢ ((𝐴 = On ∨ (𝐴 ∈ On ∧ Lim 𝐴)) ↔ (𝐴 = On ∨ ∃𝑥 ∈ (On ∖ 1o)𝐴 = (ω ·o 𝑥)))
137	8, 13, 136	3bitr2i 299	1 ⊢ (Lim 𝐴 ↔ (𝐴 = On ∨ ∃𝑥 ∈ (On ∖ 1o)𝐴 = (ω ·o 𝑥)))

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 206   ∧ wa 395   ∨ wo 846   ∨ w3o 1086   ∧ w3a 1087   = wceq 1537   ∈ wcel 2108   ≠ wne 2946  ∃wrex 3076  Vcvv 3488   ∖ cdif 3973  ∅c0 4352  ∪ cuni 4931  Ord word 6394  Oncon0 6395  Lim wlim 6396  suc csuc 6397  (class class class)co 7448  ωcom 7903  1_oc1o 8515   +_o coa 8519   ·_o comu 8520

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1793  ax-4 1807  ax-5 1909  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-10 2141  ax-11 2158  ax-12 2178  ax-ext 2711  ax-rep 5303  ax-sep 5317  ax-nul 5324  ax-pr 5447  ax-un 7770  ax-inf2 9710

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 847  df-3or 1088  df-3an 1089  df-tru 1540  df-fal 1550  df-ex 1778  df-nf 1782  df-sb 2065  df-mo 2543  df-eu 2572  df-clab 2718  df-cleq 2732  df-clel 2819  df-nfc 2895  df-ne 2947  df-ral 3068  df-rex 3077  df-rmo 3388  df-reu 3389  df-rab 3444  df-v 3490  df-sbc 3805  df-csb 3922  df-dif 3979  df-un 3981  df-in 3983  df-ss 3993  df-pss 3996  df-nul 4353  df-if 4549  df-pw 4624  df-sn 4649  df-pr 4651  df-op 4655  df-uni 4932  df-int 4971  df-iun 5017  df-br 5167  df-opab 5229  df-mpt 5250  df-tr 5284  df-id 5593  df-eprel 5599  df-po 5607  df-so 5608  df-fr 5652  df-we 5654  df-xp 5706  df-rel 5707  df-cnv 5708  df-co 5709  df-dm 5710  df-rn 5711  df-res 5712  df-ima 5713  df-pred 6332  df-ord 6398  df-on 6399  df-lim 6400  df-suc 6401  df-iota 6525  df-fun 6575  df-fn 6576  df-f 6577  df-f1 6578  df-fo 6579  df-f1o 6580  df-fv 6581  df-ov 7451  df-oprab 7452  df-mpo 7453  df-om 7904  df-2nd 8031  df-frecs 8322  df-wrecs 8353  df-recs 8427  df-rdg 8466  df-1o 8522  df-oadd 8526  df-omul 8527

This theorem is referenced by: (None)