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Theorem odd2np1lem 16280

Description: Lemma for odd2np1 16281. (Contributed by Scott Fenton, 3-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.)

**Assertion**
Ref	Expression
odd2np1lem	⊢ (𝑁 ∈ ℕ₀ → (∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑁 ∨ ∃𝑘 ∈ ℤ (𝑘 · 2) = 𝑁))

Distinct variable groups: 𝑘,𝑁 𝑛,𝑁

Proof of Theorem odd2np1lem Dummy variables 𝑗 𝑚 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		eqeq2 2736	. . . 4 ⊢ (𝑗 = 0 → (((2 · 𝑛) + 1) = 𝑗 ↔ ((2 · 𝑛) + 1) = 0))
2	1	rexbidv 3170	. . 3 ⊢ (𝑗 = 0 → (∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑗 ↔ ∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 0))
3		eqeq2 2736	. . . 4 ⊢ (𝑗 = 0 → ((𝑘 · 2) = 𝑗 ↔ (𝑘 · 2) = 0))
4	3	rexbidv 3170	. . 3 ⊢ (𝑗 = 0 → (∃𝑘 ∈ ℤ (𝑘 · 2) = 𝑗 ↔ ∃𝑘 ∈ ℤ (𝑘 · 2) = 0))
5	2, 4	orbi12d 915	. 2 ⊢ (𝑗 = 0 → ((∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑗 ∨ ∃𝑘 ∈ ℤ (𝑘 · 2) = 𝑗) ↔ (∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 0 ∨ ∃𝑘 ∈ ℤ (𝑘 · 2) = 0)))
6		eqeq2 2736	. . . . 5 ⊢ (𝑗 = 𝑚 → (((2 · 𝑛) + 1) = 𝑗 ↔ ((2 · 𝑛) + 1) = 𝑚))
7	6	rexbidv 3170	. . . 4 ⊢ (𝑗 = 𝑚 → (∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑗 ↔ ∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑚))
8		oveq2 7409	. . . . . . 7 ⊢ (𝑛 = 𝑥 → (2 · 𝑛) = (2 · 𝑥))
9	8	oveq1d 7416	. . . . . 6 ⊢ (𝑛 = 𝑥 → ((2 · 𝑛) + 1) = ((2 · 𝑥) + 1))
10	9	eqeq1d 2726	. . . . 5 ⊢ (𝑛 = 𝑥 → (((2 · 𝑛) + 1) = 𝑚 ↔ ((2 · 𝑥) + 1) = 𝑚))
11	10	cbvrexvw 3227	. . . 4 ⊢ (∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑚 ↔ ∃𝑥 ∈ ℤ ((2 · 𝑥) + 1) = 𝑚)
12	7, 11	bitrdi 287	. . 3 ⊢ (𝑗 = 𝑚 → (∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑗 ↔ ∃𝑥 ∈ ℤ ((2 · 𝑥) + 1) = 𝑚))
13		eqeq2 2736	. . . . 5 ⊢ (𝑗 = 𝑚 → ((𝑘 · 2) = 𝑗 ↔ (𝑘 · 2) = 𝑚))
14	13	rexbidv 3170	. . . 4 ⊢ (𝑗 = 𝑚 → (∃𝑘 ∈ ℤ (𝑘 · 2) = 𝑗 ↔ ∃𝑘 ∈ ℤ (𝑘 · 2) = 𝑚))
15		oveq1 7408	. . . . . 6 ⊢ (𝑘 = 𝑦 → (𝑘 · 2) = (𝑦 · 2))
16	15	eqeq1d 2726	. . . . 5 ⊢ (𝑘 = 𝑦 → ((𝑘 · 2) = 𝑚 ↔ (𝑦 · 2) = 𝑚))
17	16	cbvrexvw 3227	. . . 4 ⊢ (∃𝑘 ∈ ℤ (𝑘 · 2) = 𝑚 ↔ ∃𝑦 ∈ ℤ (𝑦 · 2) = 𝑚)
18	14, 17	bitrdi 287	. . 3 ⊢ (𝑗 = 𝑚 → (∃𝑘 ∈ ℤ (𝑘 · 2) = 𝑗 ↔ ∃𝑦 ∈ ℤ (𝑦 · 2) = 𝑚))
19	12, 18	orbi12d 915	. 2 ⊢ (𝑗 = 𝑚 → ((∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑗 ∨ ∃𝑘 ∈ ℤ (𝑘 · 2) = 𝑗) ↔ (∃𝑥 ∈ ℤ ((2 · 𝑥) + 1) = 𝑚 ∨ ∃𝑦 ∈ ℤ (𝑦 · 2) = 𝑚)))
20		eqeq2 2736	. . . 4 ⊢ (𝑗 = (𝑚 + 1) → (((2 · 𝑛) + 1) = 𝑗 ↔ ((2 · 𝑛) + 1) = (𝑚 + 1)))
21	20	rexbidv 3170	. . 3 ⊢ (𝑗 = (𝑚 + 1) → (∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑗 ↔ ∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = (𝑚 + 1)))
22		eqeq2 2736	. . . 4 ⊢ (𝑗 = (𝑚 + 1) → ((𝑘 · 2) = 𝑗 ↔ (𝑘 · 2) = (𝑚 + 1)))
23	22	rexbidv 3170	. . 3 ⊢ (𝑗 = (𝑚 + 1) → (∃𝑘 ∈ ℤ (𝑘 · 2) = 𝑗 ↔ ∃𝑘 ∈ ℤ (𝑘 · 2) = (𝑚 + 1)))
24	21, 23	orbi12d 915	. 2 ⊢ (𝑗 = (𝑚 + 1) → ((∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑗 ∨ ∃𝑘 ∈ ℤ (𝑘 · 2) = 𝑗) ↔ (∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = (𝑚 + 1) ∨ ∃𝑘 ∈ ℤ (𝑘 · 2) = (𝑚 + 1))))
25		eqeq2 2736	. . . 4 ⊢ (𝑗 = 𝑁 → (((2 · 𝑛) + 1) = 𝑗 ↔ ((2 · 𝑛) + 1) = 𝑁))
26	25	rexbidv 3170	. . 3 ⊢ (𝑗 = 𝑁 → (∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑗 ↔ ∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑁))
27		eqeq2 2736	. . . 4 ⊢ (𝑗 = 𝑁 → ((𝑘 · 2) = 𝑗 ↔ (𝑘 · 2) = 𝑁))
28	27	rexbidv 3170	. . 3 ⊢ (𝑗 = 𝑁 → (∃𝑘 ∈ ℤ (𝑘 · 2) = 𝑗 ↔ ∃𝑘 ∈ ℤ (𝑘 · 2) = 𝑁))
29	26, 28	orbi12d 915	. 2 ⊢ (𝑗 = 𝑁 → ((∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑗 ∨ ∃𝑘 ∈ ℤ (𝑘 · 2) = 𝑗) ↔ (∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑁 ∨ ∃𝑘 ∈ ℤ (𝑘 · 2) = 𝑁)))
30		0z 12566	. . . 4 ⊢ 0 ∈ ℤ
31		2cn 12284	. . . . 5 ⊢ 2 ∈ ℂ
32	31	mul02i 11400	. . . 4 ⊢ (0 · 2) = 0
33		oveq1 7408	. . . . . 6 ⊢ (𝑘 = 0 → (𝑘 · 2) = (0 · 2))
34	33	eqeq1d 2726	. . . . 5 ⊢ (𝑘 = 0 → ((𝑘 · 2) = 0 ↔ (0 · 2) = 0))
35	34	rspcev 3604	. . . 4 ⊢ ((0 ∈ ℤ ∧ (0 · 2) = 0) → ∃𝑘 ∈ ℤ (𝑘 · 2) = 0)
36	30, 32, 35	mp2an 689	. . 3 ⊢ ∃𝑘 ∈ ℤ (𝑘 · 2) = 0
37	36	olci 863	. 2 ⊢ (∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 0 ∨ ∃𝑘 ∈ ℤ (𝑘 · 2) = 0)
38		orcom 867	. . 3 ⊢ ((∃𝑥 ∈ ℤ ((2 · 𝑥) + 1) = 𝑚 ∨ ∃𝑦 ∈ ℤ (𝑦 · 2) = 𝑚) ↔ (∃𝑦 ∈ ℤ (𝑦 · 2) = 𝑚 ∨ ∃𝑥 ∈ ℤ ((2 · 𝑥) + 1) = 𝑚))
39		zcn 12560	. . . . . . . . 9 ⊢ (𝑦 ∈ ℤ → 𝑦 ∈ ℂ)
40		mulcom 11192	. . . . . . . . 9 ⊢ ((𝑦 ∈ ℂ ∧ 2 ∈ ℂ) → (𝑦 · 2) = (2 · 𝑦))
41	39, 31, 40	sylancl 585	. . . . . . . 8 ⊢ (𝑦 ∈ ℤ → (𝑦 · 2) = (2 · 𝑦))
42	41	adantl 481	. . . . . . 7 ⊢ ((𝑚 ∈ ℕ₀ ∧ 𝑦 ∈ ℤ) → (𝑦 · 2) = (2 · 𝑦))
43	42	eqeq1d 2726	. . . . . 6 ⊢ ((𝑚 ∈ ℕ₀ ∧ 𝑦 ∈ ℤ) → ((𝑦 · 2) = 𝑚 ↔ (2 · 𝑦) = 𝑚))
44		eqid 2724	. . . . . . . . 9 ⊢ ((2 · 𝑦) + 1) = ((2 · 𝑦) + 1)
45		oveq2 7409	. . . . . . . . . . . 12 ⊢ (𝑛 = 𝑦 → (2 · 𝑛) = (2 · 𝑦))
46	45	oveq1d 7416	. . . . . . . . . . 11 ⊢ (𝑛 = 𝑦 → ((2 · 𝑛) + 1) = ((2 · 𝑦) + 1))
47	46	eqeq1d 2726	. . . . . . . . . 10 ⊢ (𝑛 = 𝑦 → (((2 · 𝑛) + 1) = ((2 · 𝑦) + 1) ↔ ((2 · 𝑦) + 1) = ((2 · 𝑦) + 1)))
48	47	rspcev 3604	. . . . . . . . 9 ⊢ ((𝑦 ∈ ℤ ∧ ((2 · 𝑦) + 1) = ((2 · 𝑦) + 1)) → ∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = ((2 · 𝑦) + 1))
49	44, 48	mpan2 688	. . . . . . . 8 ⊢ (𝑦 ∈ ℤ → ∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = ((2 · 𝑦) + 1))
50		oveq1 7408	. . . . . . . . . 10 ⊢ ((2 · 𝑦) = 𝑚 → ((2 · 𝑦) + 1) = (𝑚 + 1))
51	50	eqeq2d 2735	. . . . . . . . 9 ⊢ ((2 · 𝑦) = 𝑚 → (((2 · 𝑛) + 1) = ((2 · 𝑦) + 1) ↔ ((2 · 𝑛) + 1) = (𝑚 + 1)))
52	51	rexbidv 3170	. . . . . . . 8 ⊢ ((2 · 𝑦) = 𝑚 → (∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = ((2 · 𝑦) + 1) ↔ ∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = (𝑚 + 1)))
53	49, 52	syl5ibcom 244	. . . . . . 7 ⊢ (𝑦 ∈ ℤ → ((2 · 𝑦) = 𝑚 → ∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = (𝑚 + 1)))
54	53	adantl 481	. . . . . 6 ⊢ ((𝑚 ∈ ℕ₀ ∧ 𝑦 ∈ ℤ) → ((2 · 𝑦) = 𝑚 → ∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = (𝑚 + 1)))
55	43, 54	sylbid 239	. . . . 5 ⊢ ((𝑚 ∈ ℕ₀ ∧ 𝑦 ∈ ℤ) → ((𝑦 · 2) = 𝑚 → ∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = (𝑚 + 1)))
56	55	rexlimdva 3147	. . . 4 ⊢ (𝑚 ∈ ℕ₀ → (∃𝑦 ∈ ℤ (𝑦 · 2) = 𝑚 → ∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = (𝑚 + 1)))
57		peano2z 12600	. . . . . . 7 ⊢ (𝑥 ∈ ℤ → (𝑥 + 1) ∈ ℤ)
58		zcn 12560	. . . . . . . . 9 ⊢ (𝑥 ∈ ℤ → 𝑥 ∈ ℂ)
59		mulcom 11192	. . . . . . . . . . . . 13 ⊢ ((𝑥 ∈ ℂ ∧ 2 ∈ ℂ) → (𝑥 · 2) = (2 · 𝑥))
60	31, 59	mpan2 688	. . . . . . . . . . . 12 ⊢ (𝑥 ∈ ℂ → (𝑥 · 2) = (2 · 𝑥))
61	31	mullidi 11216	. . . . . . . . . . . . 13 ⊢ (1 · 2) = 2
62	61	a1i 11	. . . . . . . . . . . 12 ⊢ (𝑥 ∈ ℂ → (1 · 2) = 2)
63	60, 62	oveq12d 7419	. . . . . . . . . . 11 ⊢ (𝑥 ∈ ℂ → ((𝑥 · 2) + (1 · 2)) = ((2 · 𝑥) + 2))
64		df-2 12272	. . . . . . . . . . . 12 ⊢ 2 = (1 + 1)
65	64	oveq2i 7412	. . . . . . . . . . 11 ⊢ ((2 · 𝑥) + 2) = ((2 · 𝑥) + (1 + 1))
66	63, 65	eqtrdi 2780	. . . . . . . . . 10 ⊢ (𝑥 ∈ ℂ → ((𝑥 · 2) + (1 · 2)) = ((2 · 𝑥) + (1 + 1)))
67		ax-1cn 11164	. . . . . . . . . . 11 ⊢ 1 ∈ ℂ
68		adddir 11202	. . . . . . . . . . 11 ⊢ ((𝑥 ∈ ℂ ∧ 1 ∈ ℂ ∧ 2 ∈ ℂ) → ((𝑥 + 1) · 2) = ((𝑥 · 2) + (1 · 2)))
69	67, 31, 68	mp3an23 1449	. . . . . . . . . 10 ⊢ (𝑥 ∈ ℂ → ((𝑥 + 1) · 2) = ((𝑥 · 2) + (1 · 2)))
70		mulcl 11190	. . . . . . . . . . . 12 ⊢ ((2 ∈ ℂ ∧ 𝑥 ∈ ℂ) → (2 · 𝑥) ∈ ℂ)
71	31, 70	mpan 687	. . . . . . . . . . 11 ⊢ (𝑥 ∈ ℂ → (2 · 𝑥) ∈ ℂ)
72		addass 11193	. . . . . . . . . . . 12 ⊢ (((2 · 𝑥) ∈ ℂ ∧ 1 ∈ ℂ ∧ 1 ∈ ℂ) → (((2 · 𝑥) + 1) + 1) = ((2 · 𝑥) + (1 + 1)))
73	67, 67, 72	mp3an23 1449	. . . . . . . . . . 11 ⊢ ((2 · 𝑥) ∈ ℂ → (((2 · 𝑥) + 1) + 1) = ((2 · 𝑥) + (1 + 1)))
74	71, 73	syl 17	. . . . . . . . . 10 ⊢ (𝑥 ∈ ℂ → (((2 · 𝑥) + 1) + 1) = ((2 · 𝑥) + (1 + 1)))
75	66, 69, 74	3eqtr4d 2774	. . . . . . . . 9 ⊢ (𝑥 ∈ ℂ → ((𝑥 + 1) · 2) = (((2 · 𝑥) + 1) + 1))
76	58, 75	syl 17	. . . . . . . 8 ⊢ (𝑥 ∈ ℤ → ((𝑥 + 1) · 2) = (((2 · 𝑥) + 1) + 1))
77	76	adantl 481	. . . . . . 7 ⊢ ((𝑚 ∈ ℕ₀ ∧ 𝑥 ∈ ℤ) → ((𝑥 + 1) · 2) = (((2 · 𝑥) + 1) + 1))
78		oveq1 7408	. . . . . . . . 9 ⊢ (𝑘 = (𝑥 + 1) → (𝑘 · 2) = ((𝑥 + 1) · 2))
79	78	eqeq1d 2726	. . . . . . . 8 ⊢ (𝑘 = (𝑥 + 1) → ((𝑘 · 2) = (((2 · 𝑥) + 1) + 1) ↔ ((𝑥 + 1) · 2) = (((2 · 𝑥) + 1) + 1)))
80	79	rspcev 3604	. . . . . . 7 ⊢ (((𝑥 + 1) ∈ ℤ ∧ ((𝑥 + 1) · 2) = (((2 · 𝑥) + 1) + 1)) → ∃𝑘 ∈ ℤ (𝑘 · 2) = (((2 · 𝑥) + 1) + 1))
81	57, 77, 80	syl2an2 683	. . . . . 6 ⊢ ((𝑚 ∈ ℕ₀ ∧ 𝑥 ∈ ℤ) → ∃𝑘 ∈ ℤ (𝑘 · 2) = (((2 · 𝑥) + 1) + 1))
82		oveq1 7408	. . . . . . . 8 ⊢ (((2 · 𝑥) + 1) = 𝑚 → (((2 · 𝑥) + 1) + 1) = (𝑚 + 1))
83	82	eqeq2d 2735	. . . . . . 7 ⊢ (((2 · 𝑥) + 1) = 𝑚 → ((𝑘 · 2) = (((2 · 𝑥) + 1) + 1) ↔ (𝑘 · 2) = (𝑚 + 1)))
84	83	rexbidv 3170	. . . . . 6 ⊢ (((2 · 𝑥) + 1) = 𝑚 → (∃𝑘 ∈ ℤ (𝑘 · 2) = (((2 · 𝑥) + 1) + 1) ↔ ∃𝑘 ∈ ℤ (𝑘 · 2) = (𝑚 + 1)))
85	81, 84	syl5ibcom 244	. . . . 5 ⊢ ((𝑚 ∈ ℕ₀ ∧ 𝑥 ∈ ℤ) → (((2 · 𝑥) + 1) = 𝑚 → ∃𝑘 ∈ ℤ (𝑘 · 2) = (𝑚 + 1)))
86	85	rexlimdva 3147	. . . 4 ⊢ (𝑚 ∈ ℕ₀ → (∃𝑥 ∈ ℤ ((2 · 𝑥) + 1) = 𝑚 → ∃𝑘 ∈ ℤ (𝑘 · 2) = (𝑚 + 1)))
87	56, 86	orim12d 961	. . 3 ⊢ (𝑚 ∈ ℕ₀ → ((∃𝑦 ∈ ℤ (𝑦 · 2) = 𝑚 ∨ ∃𝑥 ∈ ℤ ((2 · 𝑥) + 1) = 𝑚) → (∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = (𝑚 + 1) ∨ ∃𝑘 ∈ ℤ (𝑘 · 2) = (𝑚 + 1))))
88	38, 87	biimtrid 241	. 2 ⊢ (𝑚 ∈ ℕ₀ → ((∃𝑥 ∈ ℤ ((2 · 𝑥) + 1) = 𝑚 ∨ ∃𝑦 ∈ ℤ (𝑦 · 2) = 𝑚) → (∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = (𝑚 + 1) ∨ ∃𝑘 ∈ ℤ (𝑘 · 2) = (𝑚 + 1))))
89	5, 19, 24, 29, 37, 88	nn0ind 12654	1 ⊢ (𝑁 ∈ ℕ₀ → (∃𝑛 ∈ ℤ ((2 · 𝑛) + 1) = 𝑁 ∨ ∃𝑘 ∈ ℤ (𝑘 · 2) = 𝑁))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 ∨ wo 844 = wceq 1533 ∈ wcel 2098 ∃wrex 3062 (class class class)co 7401 ℂcc 11104 0cc0 11106 1c1 11107 + caddc 11109 · cmul 11111 2c2 12264 ℕ₀cn0 12469 ℤcz 12555

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2163 ax-ext 2695 ax-sep 5289 ax-nul 5296 ax-pow 5353 ax-pr 5417 ax-un 7718 ax-resscn 11163 ax-1cn 11164 ax-icn 11165 ax-addcl 11166 ax-addrcl 11167 ax-mulcl 11168 ax-mulrcl 11169 ax-mulcom 11170 ax-addass 11171 ax-mulass 11172 ax-distr 11173 ax-i2m1 11174 ax-1ne0 11175 ax-1rid 11176 ax-rnegex 11177 ax-rrecex 11178 ax-cnre 11179 ax-pre-lttri 11180 ax-pre-lttrn 11181 ax-pre-ltadd 11182 ax-pre-mulgt0 11183

This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2526 df-eu 2555 df-clab 2702 df-cleq 2716 df-clel 2802 df-nfc 2877 df-ne 2933 df-nel 3039 df-ral 3054 df-rex 3063 df-reu 3369 df-rab 3425 df-v 3468 df-sbc 3770 df-csb 3886 df-dif 3943 df-un 3945 df-in 3947 df-ss 3957 df-pss 3959 df-nul 4315 df-if 4521 df-pw 4596 df-sn 4621 df-pr 4623 df-op 4627 df-uni 4900 df-iun 4989 df-br 5139 df-opab 5201 df-mpt 5222 df-tr 5256 df-id 5564 df-eprel 5570 df-po 5578 df-so 5579 df-fr 5621 df-we 5623 df-xp 5672 df-rel 5673 df-cnv 5674 df-co 5675 df-dm 5676 df-rn 5677 df-res 5678 df-ima 5679 df-pred 6290 df-ord 6357 df-on 6358 df-lim 6359 df-suc 6360 df-iota 6485 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 df-fo 6539 df-f1o 6540 df-fv 6541 df-riota 7357 df-ov 7404 df-oprab 7405 df-mpo 7406 df-om 7849 df-2nd 7969 df-frecs 8261 df-wrecs 8292 df-recs 8366 df-rdg 8405 df-er 8699 df-en 8936 df-dom 8937 df-sdom 8938 df-pnf 11247 df-mnf 11248 df-xr 11249 df-ltxr 11250 df-le 11251 df-sub 11443 df-neg 11444 df-nn 12210 df-2 12272 df-n0 12470 df-z 12556

This theorem is referenced by: odd2np1 16281

W3C validator