Theorem ennnfonelemim 13175

Description: Lemma for ennnfone 13176. The trivial direction. (Contributed by Jim Kingdon, 27-Oct-2022.)

Assertion

Ref	Expression
ennnfonelemim	⊢ (𝐴 ≈ ℕ → (∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 DECID 𝑥 = 𝑦 ∧ ∃𝑓(𝑓:ℕ0–onto→𝐴 ∧ ∀𝑛 ∈ ℕ0 ∃𝑘 ∈ ℕ0 ∀𝑗 ∈ (0...𝑛)(𝑓‘𝑘) ≠ (𝑓‘𝑗))))

Distinct variable groups:   𝐴,𝑓,𝑗,𝑛   𝑥,𝐴,𝑦,𝑛   𝑓,𝑘,𝑗,𝑛   𝑦,𝑗

Allowed substitution hint:   𝐴(𝑘)

Proof of Theorem ennnfonelemim

Dummy variable 𝑔 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		nn0ennn 10795	. . . 4 ⊢ ℕ0 ≈ ℕ
2	1	ensymi 7022	. . 3 ⊢ ℕ ≈ ℕ0
3		entr 7024	. . 3 ⊢ ((𝐴 ≈ ℕ ∧ ℕ ≈ ℕ0) → 𝐴 ≈ ℕ0)
4	2, 3	mpan2 425	. 2 ⊢ (𝐴 ≈ ℕ → 𝐴 ≈ ℕ0)
5		bren 6983	. . . 4 ⊢ (𝐴 ≈ ℕ0 ↔ ∃𝑔 𝑔:𝐴–1-1-onto→ℕ0)
6	5	biimpi 120	. . 3 ⊢ (𝐴 ≈ ℕ0 → ∃𝑔 𝑔:𝐴–1-1-onto→ℕ0)
7		f1of 5614	. . . . . . . . . . 11 ⊢ (𝑔:𝐴–1-1-onto→ℕ0 → 𝑔:𝐴⟶ℕ0)
8	7	adantr 276	. . . . . . . . . 10 ⊢ ((𝑔:𝐴–1-1-onto→ℕ0 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) → 𝑔:𝐴⟶ℕ0)
9		simprl 531	. . . . . . . . . 10 ⊢ ((𝑔:𝐴–1-1-onto→ℕ0 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) → 𝑥 ∈ 𝐴)
10	8, 9	ffvelcdmd 5813	. . . . . . . . 9 ⊢ ((𝑔:𝐴–1-1-onto→ℕ0 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) → (𝑔‘𝑥) ∈ ℕ0)
11	10	nn0zd 9698	. . . . . . . 8 ⊢ ((𝑔:𝐴–1-1-onto→ℕ0 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) → (𝑔‘𝑥) ∈ ℤ)
12		simprr 533	. . . . . . . . . 10 ⊢ ((𝑔:𝐴–1-1-onto→ℕ0 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) → 𝑦 ∈ 𝐴)
13	8, 12	ffvelcdmd 5813	. . . . . . . . 9 ⊢ ((𝑔:𝐴–1-1-onto→ℕ0 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) → (𝑔‘𝑦) ∈ ℕ0)
14	13	nn0zd 9698	. . . . . . . 8 ⊢ ((𝑔:𝐴–1-1-onto→ℕ0 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) → (𝑔‘𝑦) ∈ ℤ)
15		zdceq 9653	. . . . . . . 8 ⊢ (((𝑔‘𝑥) ∈ ℤ ∧ (𝑔‘𝑦) ∈ ℤ) → DECID (𝑔‘𝑥) = (𝑔‘𝑦))
16	11, 14, 15	syl2anc 411	. . . . . . 7 ⊢ ((𝑔:𝐴–1-1-onto→ℕ0 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) → DECID (𝑔‘𝑥) = (𝑔‘𝑦))
17		dff1o6 5949	. . . . . . . . . . . . 13 ⊢ (𝑔:𝐴–1-1-onto→ℕ0 ↔ (𝑔 Fn 𝐴 ∧ ran 𝑔 = ℕ0 ∧ ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ((𝑔‘𝑥) = (𝑔‘𝑦) → 𝑥 = 𝑦)))
18	17	simp3bi 1041	. . . . . . . . . . . 12 ⊢ (𝑔:𝐴–1-1-onto→ℕ0 → ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 ((𝑔‘𝑥) = (𝑔‘𝑦) → 𝑥 = 𝑦))
19	18	r19.21bi 2630	. . . . . . . . . . 11 ⊢ ((𝑔:𝐴–1-1-onto→ℕ0 ∧ 𝑥 ∈ 𝐴) → ∀𝑦 ∈ 𝐴 ((𝑔‘𝑥) = (𝑔‘𝑦) → 𝑥 = 𝑦))
20	19	r19.21bi 2630	. . . . . . . . . 10 ⊢ (((𝑔:𝐴–1-1-onto→ℕ0 ∧ 𝑥 ∈ 𝐴) ∧ 𝑦 ∈ 𝐴) → ((𝑔‘𝑥) = (𝑔‘𝑦) → 𝑥 = 𝑦))
21	20	anasss 399	. . . . . . . . 9 ⊢ ((𝑔:𝐴–1-1-onto→ℕ0 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) → ((𝑔‘𝑥) = (𝑔‘𝑦) → 𝑥 = 𝑦))
22		fveq2 5670	. . . . . . . . 9 ⊢ (𝑥 = 𝑦 → (𝑔‘𝑥) = (𝑔‘𝑦))
23	21, 22	impbid1 142	. . . . . . . 8 ⊢ ((𝑔:𝐴–1-1-onto→ℕ0 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) → ((𝑔‘𝑥) = (𝑔‘𝑦) ↔ 𝑥 = 𝑦))
24	23	dcbid 846	. . . . . . 7 ⊢ ((𝑔:𝐴–1-1-onto→ℕ0 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) → (DECID (𝑔‘𝑥) = (𝑔‘𝑦) ↔ DECID 𝑥 = 𝑦))
25	16, 24	mpbid 147	. . . . . 6 ⊢ ((𝑔:𝐴–1-1-onto→ℕ0 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐴)) → DECID 𝑥 = 𝑦)
26	25	ralrimivva 2624	. . . . 5 ⊢ (𝑔:𝐴–1-1-onto→ℕ0 → ∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 DECID 𝑥 = 𝑦)
27		f1ocnv 5627	. . . . . . 7 ⊢ (𝑔:𝐴–1-1-onto→ℕ0 → ◡𝑔:ℕ0–1-1-onto→𝐴)
28		f1ofo 5621	. . . . . . 7 ⊢ (◡𝑔:ℕ0–1-1-onto→𝐴 → ◡𝑔:ℕ0–onto→𝐴)
29	27, 28	syl 14	. . . . . 6 ⊢ (𝑔:𝐴–1-1-onto→ℕ0 → ◡𝑔:ℕ0–onto→𝐴)
30		peano2nn0 9536	. . . . . . . . 9 ⊢ (𝑛 ∈ ℕ0 → (𝑛 + 1) ∈ ℕ0)
31	30	adantl 277	. . . . . . . 8 ⊢ ((𝑔:𝐴–1-1-onto→ℕ0 ∧ 𝑛 ∈ ℕ0) → (𝑛 + 1) ∈ ℕ0)
32		elfznn0 10448	. . . . . . . . . . . . . . 15 ⊢ (𝑗 ∈ (0...𝑛) → 𝑗 ∈ ℕ0)
33	32	adantl 277	. . . . . . . . . . . . . 14 ⊢ (((𝑔:𝐴–1-1-onto→ℕ0 ∧ 𝑛 ∈ ℕ0) ∧ 𝑗 ∈ (0...𝑛)) → 𝑗 ∈ ℕ0)
34	33	nn0red 9554	. . . . . . . . . . . . 13 ⊢ (((𝑔:𝐴–1-1-onto→ℕ0 ∧ 𝑛 ∈ ℕ0) ∧ 𝑗 ∈ (0...𝑛)) → 𝑗 ∈ ℝ)
35		elfzle2 10362	. . . . . . . . . . . . . . 15 ⊢ (𝑗 ∈ (0...𝑛) → 𝑗 ≤ 𝑛)
36	35	adantl 277	. . . . . . . . . . . . . 14 ⊢ (((𝑔:𝐴–1-1-onto→ℕ0 ∧ 𝑛 ∈ ℕ0) ∧ 𝑗 ∈ (0...𝑛)) → 𝑗 ≤ 𝑛)
37		simplr 529	. . . . . . . . . . . . . . 15 ⊢ (((𝑔:𝐴–1-1-onto→ℕ0 ∧ 𝑛 ∈ ℕ0) ∧ 𝑗 ∈ (0...𝑛)) → 𝑛 ∈ ℕ0)
38		nn0leltp1 9641	. . . . . . . . . . . . . . 15 ⊢ ((𝑗 ∈ ℕ0 ∧ 𝑛 ∈ ℕ0) → (𝑗 ≤ 𝑛 ↔ 𝑗 < (𝑛 + 1)))
39	33, 37, 38	syl2anc 411	. . . . . . . . . . . . . 14 ⊢ (((𝑔:𝐴–1-1-onto→ℕ0 ∧ 𝑛 ∈ ℕ0) ∧ 𝑗 ∈ (0...𝑛)) → (𝑗 ≤ 𝑛 ↔ 𝑗 < (𝑛 + 1)))
40	36, 39	mpbid 147	. . . . . . . . . . . . 13 ⊢ (((𝑔:𝐴–1-1-onto→ℕ0 ∧ 𝑛 ∈ ℕ0) ∧ 𝑗 ∈ (0...𝑛)) → 𝑗 < (𝑛 + 1))
41	34, 40	gtned 8386	. . . . . . . . . . . 12 ⊢ (((𝑔:𝐴–1-1-onto→ℕ0 ∧ 𝑛 ∈ ℕ0) ∧ 𝑗 ∈ (0...𝑛)) → (𝑛 + 1) ≠ 𝑗)
42	41	neneqd 2433	. . . . . . . . . . 11 ⊢ (((𝑔:𝐴–1-1-onto→ℕ0 ∧ 𝑛 ∈ ℕ0) ∧ 𝑗 ∈ (0...𝑛)) → ¬ (𝑛 + 1) = 𝑗)
43		dff1o6 5949	. . . . . . . . . . . . . . 15 ⊢ (◡𝑔:ℕ0–1-1-onto→𝐴 ↔ (◡𝑔 Fn ℕ0 ∧ ran ◡𝑔 = 𝐴 ∧ ∀𝑥 ∈ ℕ0 ∀𝑦 ∈ ℕ0 ((◡𝑔‘𝑥) = (◡𝑔‘𝑦) → 𝑥 = 𝑦)))
44	27, 43	sylib 122	. . . . . . . . . . . . . 14 ⊢ (𝑔:𝐴–1-1-onto→ℕ0 → (◡𝑔 Fn ℕ0 ∧ ran ◡𝑔 = 𝐴 ∧ ∀𝑥 ∈ ℕ0 ∀𝑦 ∈ ℕ0 ((◡𝑔‘𝑥) = (◡𝑔‘𝑦) → 𝑥 = 𝑦)))
45	44	simp3d 1038	. . . . . . . . . . . . 13 ⊢ (𝑔:𝐴–1-1-onto→ℕ0 → ∀𝑥 ∈ ℕ0 ∀𝑦 ∈ ℕ0 ((◡𝑔‘𝑥) = (◡𝑔‘𝑦) → 𝑥 = 𝑦))
46	45	ad2antrr 488	. . . . . . . . . . . 12 ⊢ (((𝑔:𝐴–1-1-onto→ℕ0 ∧ 𝑛 ∈ ℕ0) ∧ 𝑗 ∈ (0...𝑛)) → ∀𝑥 ∈ ℕ0 ∀𝑦 ∈ ℕ0 ((◡𝑔‘𝑥) = (◡𝑔‘𝑦) → 𝑥 = 𝑦))
47	31	adantr 276	. . . . . . . . . . . . 13 ⊢ (((𝑔:𝐴–1-1-onto→ℕ0 ∧ 𝑛 ∈ ℕ0) ∧ 𝑗 ∈ (0...𝑛)) → (𝑛 + 1) ∈ ℕ0)
48		fveqeq2 5679	. . . . . . . . . . . . . . 15 ⊢ (𝑥 = (𝑛 + 1) → ((◡𝑔‘𝑥) = (◡𝑔‘𝑦) ↔ (◡𝑔‘(𝑛 + 1)) = (◡𝑔‘𝑦)))
49		eqeq1 2239	. . . . . . . . . . . . . . 15 ⊢ (𝑥 = (𝑛 + 1) → (𝑥 = 𝑦 ↔ (𝑛 + 1) = 𝑦))
50	48, 49	imbi12d 234	. . . . . . . . . . . . . 14 ⊢ (𝑥 = (𝑛 + 1) → (((◡𝑔‘𝑥) = (◡𝑔‘𝑦) → 𝑥 = 𝑦) ↔ ((◡𝑔‘(𝑛 + 1)) = (◡𝑔‘𝑦) → (𝑛 + 1) = 𝑦)))
51		fveq2 5670	. . . . . . . . . . . . . . . 16 ⊢ (𝑦 = 𝑗 → (◡𝑔‘𝑦) = (◡𝑔‘𝑗))
52	51	eqeq2d 2244	. . . . . . . . . . . . . . 15 ⊢ (𝑦 = 𝑗 → ((◡𝑔‘(𝑛 + 1)) = (◡𝑔‘𝑦) ↔ (◡𝑔‘(𝑛 + 1)) = (◡𝑔‘𝑗)))
53		eqeq2 2242	. . . . . . . . . . . . . . 15 ⊢ (𝑦 = 𝑗 → ((𝑛 + 1) = 𝑦 ↔ (𝑛 + 1) = 𝑗))
54	52, 53	imbi12d 234	. . . . . . . . . . . . . 14 ⊢ (𝑦 = 𝑗 → (((◡𝑔‘(𝑛 + 1)) = (◡𝑔‘𝑦) → (𝑛 + 1) = 𝑦) ↔ ((◡𝑔‘(𝑛 + 1)) = (◡𝑔‘𝑗) → (𝑛 + 1) = 𝑗)))
55	50, 54	rspc2v 2934	. . . . . . . . . . . . 13 ⊢ (((𝑛 + 1) ∈ ℕ0 ∧ 𝑗 ∈ ℕ0) → (∀𝑥 ∈ ℕ0 ∀𝑦 ∈ ℕ0 ((◡𝑔‘𝑥) = (◡𝑔‘𝑦) → 𝑥 = 𝑦) → ((◡𝑔‘(𝑛 + 1)) = (◡𝑔‘𝑗) → (𝑛 + 1) = 𝑗)))
56	47, 33, 55	syl2anc 411	. . . . . . . . . . . 12 ⊢ (((𝑔:𝐴–1-1-onto→ℕ0 ∧ 𝑛 ∈ ℕ0) ∧ 𝑗 ∈ (0...𝑛)) → (∀𝑥 ∈ ℕ0 ∀𝑦 ∈ ℕ0 ((◡𝑔‘𝑥) = (◡𝑔‘𝑦) → 𝑥 = 𝑦) → ((◡𝑔‘(𝑛 + 1)) = (◡𝑔‘𝑗) → (𝑛 + 1) = 𝑗)))
57	46, 56	mpd 13	. . . . . . . . . . 11 ⊢ (((𝑔:𝐴–1-1-onto→ℕ0 ∧ 𝑛 ∈ ℕ0) ∧ 𝑗 ∈ (0...𝑛)) → ((◡𝑔‘(𝑛 + 1)) = (◡𝑔‘𝑗) → (𝑛 + 1) = 𝑗))
58	42, 57	mtod 669	. . . . . . . . . 10 ⊢ (((𝑔:𝐴–1-1-onto→ℕ0 ∧ 𝑛 ∈ ℕ0) ∧ 𝑗 ∈ (0...𝑛)) → ¬ (◡𝑔‘(𝑛 + 1)) = (◡𝑔‘𝑗))
59	58	neqned 2419	. . . . . . . . 9 ⊢ (((𝑔:𝐴–1-1-onto→ℕ0 ∧ 𝑛 ∈ ℕ0) ∧ 𝑗 ∈ (0...𝑛)) → (◡𝑔‘(𝑛 + 1)) ≠ (◡𝑔‘𝑗))
60	59	ralrimiva 2615	. . . . . . . 8 ⊢ ((𝑔:𝐴–1-1-onto→ℕ0 ∧ 𝑛 ∈ ℕ0) → ∀𝑗 ∈ (0...𝑛)(◡𝑔‘(𝑛 + 1)) ≠ (◡𝑔‘𝑗))
61		fveq2 5670	. . . . . . . . . . 11 ⊢ (𝑘 = (𝑛 + 1) → (◡𝑔‘𝑘) = (◡𝑔‘(𝑛 + 1)))
62	61	neeq1d 2430	. . . . . . . . . 10 ⊢ (𝑘 = (𝑛 + 1) → ((◡𝑔‘𝑘) ≠ (◡𝑔‘𝑗) ↔ (◡𝑔‘(𝑛 + 1)) ≠ (◡𝑔‘𝑗)))
63	62	ralbidv 2542	. . . . . . . . 9 ⊢ (𝑘 = (𝑛 + 1) → (∀𝑗 ∈ (0...𝑛)(◡𝑔‘𝑘) ≠ (◡𝑔‘𝑗) ↔ ∀𝑗 ∈ (0...𝑛)(◡𝑔‘(𝑛 + 1)) ≠ (◡𝑔‘𝑗)))
64	63	rspcev 2921	. . . . . . . 8 ⊢ (((𝑛 + 1) ∈ ℕ0 ∧ ∀𝑗 ∈ (0...𝑛)(◡𝑔‘(𝑛 + 1)) ≠ (◡𝑔‘𝑗)) → ∃𝑘 ∈ ℕ0 ∀𝑗 ∈ (0...𝑛)(◡𝑔‘𝑘) ≠ (◡𝑔‘𝑗))
65	31, 60, 64	syl2anc 411	. . . . . . 7 ⊢ ((𝑔:𝐴–1-1-onto→ℕ0 ∧ 𝑛 ∈ ℕ0) → ∃𝑘 ∈ ℕ0 ∀𝑗 ∈ (0...𝑛)(◡𝑔‘𝑘) ≠ (◡𝑔‘𝑗))
66	65	ralrimiva 2615	. . . . . 6 ⊢ (𝑔:𝐴–1-1-onto→ℕ0 → ∀𝑛 ∈ ℕ0 ∃𝑘 ∈ ℕ0 ∀𝑗 ∈ (0...𝑛)(◡𝑔‘𝑘) ≠ (◡𝑔‘𝑗))
67		cnvexg 5300	. . . . . . . 8 ⊢ (𝑔 ∈ V → ◡𝑔 ∈ V)
68	67	elv 2817	. . . . . . 7 ⊢ ◡𝑔 ∈ V
69		foeq1 5586	. . . . . . . 8 ⊢ (𝑓 = ◡𝑔 → (𝑓:ℕ0–onto→𝐴 ↔ ◡𝑔:ℕ0–onto→𝐴))
70		fveq1 5669	. . . . . . . . . . 11 ⊢ (𝑓 = ◡𝑔 → (𝑓‘𝑘) = (◡𝑔‘𝑘))
71		fveq1 5669	. . . . . . . . . . 11 ⊢ (𝑓 = ◡𝑔 → (𝑓‘𝑗) = (◡𝑔‘𝑗))
72	70, 71	neeq12d 2432	. . . . . . . . . 10 ⊢ (𝑓 = ◡𝑔 → ((𝑓‘𝑘) ≠ (𝑓‘𝑗) ↔ (◡𝑔‘𝑘) ≠ (◡𝑔‘𝑗)))
73	72	rexralbidv 2568	. . . . . . . . 9 ⊢ (𝑓 = ◡𝑔 → (∃𝑘 ∈ ℕ0 ∀𝑗 ∈ (0...𝑛)(𝑓‘𝑘) ≠ (𝑓‘𝑗) ↔ ∃𝑘 ∈ ℕ0 ∀𝑗 ∈ (0...𝑛)(◡𝑔‘𝑘) ≠ (◡𝑔‘𝑗)))
74	73	ralbidv 2542	. . . . . . . 8 ⊢ (𝑓 = ◡𝑔 → (∀𝑛 ∈ ℕ0 ∃𝑘 ∈ ℕ0 ∀𝑗 ∈ (0...𝑛)(𝑓‘𝑘) ≠ (𝑓‘𝑗) ↔ ∀𝑛 ∈ ℕ0 ∃𝑘 ∈ ℕ0 ∀𝑗 ∈ (0...𝑛)(◡𝑔‘𝑘) ≠ (◡𝑔‘𝑗)))
75	69, 74	anbi12d 473	. . . . . . 7 ⊢ (𝑓 = ◡𝑔 → ((𝑓:ℕ0–onto→𝐴 ∧ ∀𝑛 ∈ ℕ0 ∃𝑘 ∈ ℕ0 ∀𝑗 ∈ (0...𝑛)(𝑓‘𝑘) ≠ (𝑓‘𝑗)) ↔ (◡𝑔:ℕ0–onto→𝐴 ∧ ∀𝑛 ∈ ℕ0 ∃𝑘 ∈ ℕ0 ∀𝑗 ∈ (0...𝑛)(◡𝑔‘𝑘) ≠ (◡𝑔‘𝑗))))
76	68, 75	spcev 2912	. . . . . 6 ⊢ ((◡𝑔:ℕ0–onto→𝐴 ∧ ∀𝑛 ∈ ℕ0 ∃𝑘 ∈ ℕ0 ∀𝑗 ∈ (0...𝑛)(◡𝑔‘𝑘) ≠ (◡𝑔‘𝑗)) → ∃𝑓(𝑓:ℕ0–onto→𝐴 ∧ ∀𝑛 ∈ ℕ0 ∃𝑘 ∈ ℕ0 ∀𝑗 ∈ (0...𝑛)(𝑓‘𝑘) ≠ (𝑓‘𝑗)))
77	29, 66, 76	syl2anc 411	. . . . 5 ⊢ (𝑔:𝐴–1-1-onto→ℕ0 → ∃𝑓(𝑓:ℕ0–onto→𝐴 ∧ ∀𝑛 ∈ ℕ0 ∃𝑘 ∈ ℕ0 ∀𝑗 ∈ (0...𝑛)(𝑓‘𝑘) ≠ (𝑓‘𝑗)))
78	26, 77	jca 306	. . . 4 ⊢ (𝑔:𝐴–1-1-onto→ℕ0 → (∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 DECID 𝑥 = 𝑦 ∧ ∃𝑓(𝑓:ℕ0–onto→𝐴 ∧ ∀𝑛 ∈ ℕ0 ∃𝑘 ∈ ℕ0 ∀𝑗 ∈ (0...𝑛)(𝑓‘𝑘) ≠ (𝑓‘𝑗))))
79	78	adantl 277	. . 3 ⊢ ((𝐴 ≈ ℕ0 ∧ 𝑔:𝐴–1-1-onto→ℕ0) → (∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 DECID 𝑥 = 𝑦 ∧ ∃𝑓(𝑓:ℕ0–onto→𝐴 ∧ ∀𝑛 ∈ ℕ0 ∃𝑘 ∈ ℕ0 ∀𝑗 ∈ (0...𝑛)(𝑓‘𝑘) ≠ (𝑓‘𝑗))))
80	6, 79	exlimddv 1948	. 2 ⊢ (𝐴 ≈ ℕ0 → (∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 DECID 𝑥 = 𝑦 ∧ ∃𝑓(𝑓:ℕ0–onto→𝐴 ∧ ∀𝑛 ∈ ℕ0 ∃𝑘 ∈ ℕ0 ∀𝑗 ∈ (0...𝑛)(𝑓‘𝑘) ≠ (𝑓‘𝑗))))
81	4, 80	syl 14	1 ⊢ (𝐴 ≈ ℕ → (∀𝑥 ∈ 𝐴 ∀𝑦 ∈ 𝐴 DECID 𝑥 = 𝑦 ∧ ∃𝑓(𝑓:ℕ0–onto→𝐴 ∧ ∀𝑛 ∈ ℕ0 ∃𝑘 ∈ ℕ0 ∀𝑗 ∈ (0...𝑛)(𝑓‘𝑘) ≠ (𝑓‘𝑗))))

Syntax hints:   → wi 4   ∧ wa 104   ↔ wb 105  DECID wdc 842   ∧ w3a 1005   = wceq 1398  ∃wex 1541   ∈ wcel 2203   ≠ wne 2412  ∀wral 2520  ∃wrex 2521  Vcvv 2813   class class class wbr 4109  ^◡ccnv 4748  ran crn 4750   Fn wfn 5347  ⟶wf 5348  –onto→wfo 5350  –1-1-onto→wf1o 5351  ‘cfv 5352  (class class class)co 6050   ≈ cen 6973  0cc0 8127  1c1 8128   + caddc 8130   < clt 8308   ≤ cle 8309  ℕcn 9237  ℕ₀cn0 9496  ℤcz 9577  ...cfz 10342

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2205  ax-14 2206  ax-ext 2214  ax-sep 4228  ax-pow 4287  ax-pr 4322  ax-un 4554  ax-setind 4659  ax-cnex 8218  ax-resscn 8219  ax-1cn 8220  ax-1re 8221  ax-icn 8222  ax-addcl 8223  ax-addrcl 8224  ax-mulcl 8225  ax-addcom 8227  ax-addass 8229  ax-distr 8231  ax-i2m1 8232  ax-0lt1 8233  ax-0id 8235  ax-rnegex 8236  ax-cnre 8238  ax-pre-ltirr 8239  ax-pre-ltwlin 8240  ax-pre-lttrn 8241  ax-pre-ltadd 8243

This theorem depends on definitions:  df-bi 117  df-dc 843  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ne 2413  df-nel 2508  df-ral 2525  df-rex 2526  df-reu 2527  df-rab 2529  df-v 2815  df-sbc 3043  df-dif 3213  df-un 3215  df-in 3217  df-ss 3224  df-pw 3671  df-sn 3695  df-pr 3696  df-op 3698  df-uni 3915  df-int 3950  df-br 4110  df-opab 4172  df-mpt 4173  df-id 4414  df-xp 4755  df-rel 4756  df-cnv 4757  df-co 4758  df-dm 4759  df-rn 4760  df-res 4761  df-ima 4762  df-iota 5312  df-fun 5354  df-fn 5355  df-f 5356  df-f1 5357  df-fo 5358  df-f1o 5359  df-fv 5360  df-riota 6003  df-ov 6053  df-oprab 6054  df-mpo 6055  df-er 6767  df-en 6976  df-pnf 8310  df-mnf 8311  df-xr 8312  df-ltxr 8313  df-le 8314  df-sub 8446  df-neg 8447  df-inn 9238  df-n0 9497  df-z 9578  df-uz 9854  df-fz 10343

This theorem is referenced by:  ennnfone  13176