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Theorem 2sqnn0 26491

Description: All primes of the form 4𝑘 + 1 are sums of squares of two nonnegative integers. (Contributed by AV, 3-Jun-2023.)

**Assertion**
Ref	Expression
2sqnn0	⊢ ((𝑃 ∈ ℙ ∧ (𝑃 mod 4) = 1) → ∃𝑥 ∈ ℕ₀ ∃𝑦 ∈ ℕ₀ 𝑃 = ((𝑥↑2) + (𝑦↑2)))

Distinct variable group: 𝑥,𝑃,𝑦

Proof of Theorem 2sqnn0 Dummy variables 𝑎 𝑏 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		2sq 26483	. 2 ⊢ ((𝑃 ∈ ℙ ∧ (𝑃 mod 4) = 1) → ∃𝑎 ∈ ℤ ∃𝑏 ∈ ℤ 𝑃 = ((𝑎↑2) + (𝑏↑2)))
2		elnn0z 12262	. . . . . . . . 9 ⊢ (𝑎 ∈ ℕ₀ ↔ (𝑎 ∈ ℤ ∧ 0 ≤ 𝑎))
3	2	biimpri 227	. . . . . . . 8 ⊢ ((𝑎 ∈ ℤ ∧ 0 ≤ 𝑎) → 𝑎 ∈ ℕ₀)
4		elznn0 12264	. . . . . . . . . 10 ⊢ (𝑎 ∈ ℤ ↔ (𝑎 ∈ ℝ ∧ (𝑎 ∈ ℕ₀ ∨ -𝑎 ∈ ℕ₀)))
5		nn0ge0 12188	. . . . . . . . . . . . . 14 ⊢ (𝑎 ∈ ℕ₀ → 0 ≤ 𝑎)
6	5	pm2.24d 151	. . . . . . . . . . . . 13 ⊢ (𝑎 ∈ ℕ₀ → (¬ 0 ≤ 𝑎 → -𝑎 ∈ ℕ₀))
7	6	a1i 11	. . . . . . . . . . . 12 ⊢ (𝑎 ∈ ℝ → (𝑎 ∈ ℕ₀ → (¬ 0 ≤ 𝑎 → -𝑎 ∈ ℕ₀)))
8		ax-1 6	. . . . . . . . . . . . 13 ⊢ (-𝑎 ∈ ℕ₀ → (¬ 0 ≤ 𝑎 → -𝑎 ∈ ℕ₀))
9	8	a1i 11	. . . . . . . . . . . 12 ⊢ (𝑎 ∈ ℝ → (-𝑎 ∈ ℕ₀ → (¬ 0 ≤ 𝑎 → -𝑎 ∈ ℕ₀)))
10	7, 9	jaod 855	. . . . . . . . . . 11 ⊢ (𝑎 ∈ ℝ → ((𝑎 ∈ ℕ₀ ∨ -𝑎 ∈ ℕ₀) → (¬ 0 ≤ 𝑎 → -𝑎 ∈ ℕ₀)))
11	10	imp 406	. . . . . . . . . 10 ⊢ ((𝑎 ∈ ℝ ∧ (𝑎 ∈ ℕ₀ ∨ -𝑎 ∈ ℕ₀)) → (¬ 0 ≤ 𝑎 → -𝑎 ∈ ℕ₀))
12	4, 11	sylbi 216	. . . . . . . . 9 ⊢ (𝑎 ∈ ℤ → (¬ 0 ≤ 𝑎 → -𝑎 ∈ ℕ₀))
13	12	imp 406	. . . . . . . 8 ⊢ ((𝑎 ∈ ℤ ∧ ¬ 0 ≤ 𝑎) → -𝑎 ∈ ℕ₀)
14	3, 13	ifclda 4491	. . . . . . 7 ⊢ (𝑎 ∈ ℤ → if(0 ≤ 𝑎, 𝑎, -𝑎) ∈ ℕ₀)
15	14	adantr 480	. . . . . 6 ⊢ ((𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ) → if(0 ≤ 𝑎, 𝑎, -𝑎) ∈ ℕ₀)
16	15	adantr 480	. . . . 5 ⊢ (((𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ) ∧ 𝑃 = ((𝑎↑2) + (𝑏↑2))) → if(0 ≤ 𝑎, 𝑎, -𝑎) ∈ ℕ₀)
17		elnn0z 12262	. . . . . . . . 9 ⊢ (𝑏 ∈ ℕ₀ ↔ (𝑏 ∈ ℤ ∧ 0 ≤ 𝑏))
18	17	biimpri 227	. . . . . . . 8 ⊢ ((𝑏 ∈ ℤ ∧ 0 ≤ 𝑏) → 𝑏 ∈ ℕ₀)
19		elznn0 12264	. . . . . . . . . 10 ⊢ (𝑏 ∈ ℤ ↔ (𝑏 ∈ ℝ ∧ (𝑏 ∈ ℕ₀ ∨ -𝑏 ∈ ℕ₀)))
20		nn0ge0 12188	. . . . . . . . . . . . . 14 ⊢ (𝑏 ∈ ℕ₀ → 0 ≤ 𝑏)
21	20	pm2.24d 151	. . . . . . . . . . . . 13 ⊢ (𝑏 ∈ ℕ₀ → (¬ 0 ≤ 𝑏 → -𝑏 ∈ ℕ₀))
22	21	a1i 11	. . . . . . . . . . . 12 ⊢ (𝑏 ∈ ℝ → (𝑏 ∈ ℕ₀ → (¬ 0 ≤ 𝑏 → -𝑏 ∈ ℕ₀)))
23		ax-1 6	. . . . . . . . . . . . 13 ⊢ (-𝑏 ∈ ℕ₀ → (¬ 0 ≤ 𝑏 → -𝑏 ∈ ℕ₀))
24	23	a1i 11	. . . . . . . . . . . 12 ⊢ (𝑏 ∈ ℝ → (-𝑏 ∈ ℕ₀ → (¬ 0 ≤ 𝑏 → -𝑏 ∈ ℕ₀)))
25	22, 24	jaod 855	. . . . . . . . . . 11 ⊢ (𝑏 ∈ ℝ → ((𝑏 ∈ ℕ₀ ∨ -𝑏 ∈ ℕ₀) → (¬ 0 ≤ 𝑏 → -𝑏 ∈ ℕ₀)))
26	25	imp 406	. . . . . . . . . 10 ⊢ ((𝑏 ∈ ℝ ∧ (𝑏 ∈ ℕ₀ ∨ -𝑏 ∈ ℕ₀)) → (¬ 0 ≤ 𝑏 → -𝑏 ∈ ℕ₀))
27	19, 26	sylbi 216	. . . . . . . . 9 ⊢ (𝑏 ∈ ℤ → (¬ 0 ≤ 𝑏 → -𝑏 ∈ ℕ₀))
28	27	imp 406	. . . . . . . 8 ⊢ ((𝑏 ∈ ℤ ∧ ¬ 0 ≤ 𝑏) → -𝑏 ∈ ℕ₀)
29	18, 28	ifclda 4491	. . . . . . 7 ⊢ (𝑏 ∈ ℤ → if(0 ≤ 𝑏, 𝑏, -𝑏) ∈ ℕ₀)
30	29	adantl 481	. . . . . 6 ⊢ ((𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ) → if(0 ≤ 𝑏, 𝑏, -𝑏) ∈ ℕ₀)
31	30	adantr 480	. . . . 5 ⊢ (((𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ) ∧ 𝑃 = ((𝑎↑2) + (𝑏↑2))) → if(0 ≤ 𝑏, 𝑏, -𝑏) ∈ ℕ₀)
32		elznn0nn 12263	. . . . . . . . . 10 ⊢ (𝑎 ∈ ℤ ↔ (𝑎 ∈ ℕ₀ ∨ (𝑎 ∈ ℝ ∧ -𝑎 ∈ ℕ)))
33	5	iftrued 4464	. . . . . . . . . . . . 13 ⊢ (𝑎 ∈ ℕ₀ → if(0 ≤ 𝑎, 𝑎, -𝑎) = 𝑎)
34	33	eqcomd 2744	. . . . . . . . . . . 12 ⊢ (𝑎 ∈ ℕ₀ → 𝑎 = if(0 ≤ 𝑎, 𝑎, -𝑎))
35	34	oveq1d 7270	. . . . . . . . . . 11 ⊢ (𝑎 ∈ ℕ₀ → (𝑎↑2) = (if(0 ≤ 𝑎, 𝑎, -𝑎)↑2))
36		elnnz 12259	. . . . . . . . . . . . . . . 16 ⊢ (-𝑎 ∈ ℕ ↔ (-𝑎 ∈ ℤ ∧ 0 < -𝑎))
37		lt0neg1 11411	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑎 ∈ ℝ → (𝑎 < 0 ↔ 0 < -𝑎))
38		id 22	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑎 ∈ ℝ → 𝑎 ∈ ℝ)
39		0red 10909	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑎 ∈ ℝ → 0 ∈ ℝ)
40	38, 39	ltnled 11052	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑎 ∈ ℝ → (𝑎 < 0 ↔ ¬ 0 ≤ 𝑎))
41	40	biimpd 228	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑎 ∈ ℝ → (𝑎 < 0 → ¬ 0 ≤ 𝑎))
42	37, 41	sylbird 259	. . . . . . . . . . . . . . . . 17 ⊢ (𝑎 ∈ ℝ → (0 < -𝑎 → ¬ 0 ≤ 𝑎))
43	42	com12 32	. . . . . . . . . . . . . . . 16 ⊢ (0 < -𝑎 → (𝑎 ∈ ℝ → ¬ 0 ≤ 𝑎))
44	36, 43	simplbiim 504	. . . . . . . . . . . . . . 15 ⊢ (-𝑎 ∈ ℕ → (𝑎 ∈ ℝ → ¬ 0 ≤ 𝑎))
45	44	impcom 407	. . . . . . . . . . . . . 14 ⊢ ((𝑎 ∈ ℝ ∧ -𝑎 ∈ ℕ) → ¬ 0 ≤ 𝑎)
46	45	iffalsed 4467	. . . . . . . . . . . . 13 ⊢ ((𝑎 ∈ ℝ ∧ -𝑎 ∈ ℕ) → if(0 ≤ 𝑎, 𝑎, -𝑎) = -𝑎)
47	46	oveq1d 7270	. . . . . . . . . . . 12 ⊢ ((𝑎 ∈ ℝ ∧ -𝑎 ∈ ℕ) → (if(0 ≤ 𝑎, 𝑎, -𝑎)↑2) = (-𝑎↑2))
48		recn 10892	. . . . . . . . . . . . . 14 ⊢ (𝑎 ∈ ℝ → 𝑎 ∈ ℂ)
49		sqneg 13764	. . . . . . . . . . . . . 14 ⊢ (𝑎 ∈ ℂ → (-𝑎↑2) = (𝑎↑2))
50	48, 49	syl 17	. . . . . . . . . . . . 13 ⊢ (𝑎 ∈ ℝ → (-𝑎↑2) = (𝑎↑2))
51	50	adantr 480	. . . . . . . . . . . 12 ⊢ ((𝑎 ∈ ℝ ∧ -𝑎 ∈ ℕ) → (-𝑎↑2) = (𝑎↑2))
52	47, 51	eqtr2d 2779	. . . . . . . . . . 11 ⊢ ((𝑎 ∈ ℝ ∧ -𝑎 ∈ ℕ) → (𝑎↑2) = (if(0 ≤ 𝑎, 𝑎, -𝑎)↑2))
53	35, 52	jaoi 853	. . . . . . . . . 10 ⊢ ((𝑎 ∈ ℕ₀ ∨ (𝑎 ∈ ℝ ∧ -𝑎 ∈ ℕ)) → (𝑎↑2) = (if(0 ≤ 𝑎, 𝑎, -𝑎)↑2))
54	32, 53	sylbi 216	. . . . . . . . 9 ⊢ (𝑎 ∈ ℤ → (𝑎↑2) = (if(0 ≤ 𝑎, 𝑎, -𝑎)↑2))
55		elznn0nn 12263	. . . . . . . . . 10 ⊢ (𝑏 ∈ ℤ ↔ (𝑏 ∈ ℕ₀ ∨ (𝑏 ∈ ℝ ∧ -𝑏 ∈ ℕ)))
56	20	iftrued 4464	. . . . . . . . . . . . 13 ⊢ (𝑏 ∈ ℕ₀ → if(0 ≤ 𝑏, 𝑏, -𝑏) = 𝑏)
57	56	eqcomd 2744	. . . . . . . . . . . 12 ⊢ (𝑏 ∈ ℕ₀ → 𝑏 = if(0 ≤ 𝑏, 𝑏, -𝑏))
58	57	oveq1d 7270	. . . . . . . . . . 11 ⊢ (𝑏 ∈ ℕ₀ → (𝑏↑2) = (if(0 ≤ 𝑏, 𝑏, -𝑏)↑2))
59		elnnz 12259	. . . . . . . . . . . . . . . 16 ⊢ (-𝑏 ∈ ℕ ↔ (-𝑏 ∈ ℤ ∧ 0 < -𝑏))
60		lt0neg1 11411	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑏 ∈ ℝ → (𝑏 < 0 ↔ 0 < -𝑏))
61		id 22	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑏 ∈ ℝ → 𝑏 ∈ ℝ)
62		0red 10909	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑏 ∈ ℝ → 0 ∈ ℝ)
63	61, 62	ltnled 11052	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑏 ∈ ℝ → (𝑏 < 0 ↔ ¬ 0 ≤ 𝑏))
64	63	biimpd 228	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑏 ∈ ℝ → (𝑏 < 0 → ¬ 0 ≤ 𝑏))
65	60, 64	sylbird 259	. . . . . . . . . . . . . . . . 17 ⊢ (𝑏 ∈ ℝ → (0 < -𝑏 → ¬ 0 ≤ 𝑏))
66	65	com12 32	. . . . . . . . . . . . . . . 16 ⊢ (0 < -𝑏 → (𝑏 ∈ ℝ → ¬ 0 ≤ 𝑏))
67	59, 66	simplbiim 504	. . . . . . . . . . . . . . 15 ⊢ (-𝑏 ∈ ℕ → (𝑏 ∈ ℝ → ¬ 0 ≤ 𝑏))
68	67	impcom 407	. . . . . . . . . . . . . 14 ⊢ ((𝑏 ∈ ℝ ∧ -𝑏 ∈ ℕ) → ¬ 0 ≤ 𝑏)
69	68	iffalsed 4467	. . . . . . . . . . . . 13 ⊢ ((𝑏 ∈ ℝ ∧ -𝑏 ∈ ℕ) → if(0 ≤ 𝑏, 𝑏, -𝑏) = -𝑏)
70	69	oveq1d 7270	. . . . . . . . . . . 12 ⊢ ((𝑏 ∈ ℝ ∧ -𝑏 ∈ ℕ) → (if(0 ≤ 𝑏, 𝑏, -𝑏)↑2) = (-𝑏↑2))
71		recn 10892	. . . . . . . . . . . . . 14 ⊢ (𝑏 ∈ ℝ → 𝑏 ∈ ℂ)
72		sqneg 13764	. . . . . . . . . . . . . 14 ⊢ (𝑏 ∈ ℂ → (-𝑏↑2) = (𝑏↑2))
73	71, 72	syl 17	. . . . . . . . . . . . 13 ⊢ (𝑏 ∈ ℝ → (-𝑏↑2) = (𝑏↑2))
74	73	adantr 480	. . . . . . . . . . . 12 ⊢ ((𝑏 ∈ ℝ ∧ -𝑏 ∈ ℕ) → (-𝑏↑2) = (𝑏↑2))
75	70, 74	eqtr2d 2779	. . . . . . . . . . 11 ⊢ ((𝑏 ∈ ℝ ∧ -𝑏 ∈ ℕ) → (𝑏↑2) = (if(0 ≤ 𝑏, 𝑏, -𝑏)↑2))
76	58, 75	jaoi 853	. . . . . . . . . 10 ⊢ ((𝑏 ∈ ℕ₀ ∨ (𝑏 ∈ ℝ ∧ -𝑏 ∈ ℕ)) → (𝑏↑2) = (if(0 ≤ 𝑏, 𝑏, -𝑏)↑2))
77	55, 76	sylbi 216	. . . . . . . . 9 ⊢ (𝑏 ∈ ℤ → (𝑏↑2) = (if(0 ≤ 𝑏, 𝑏, -𝑏)↑2))
78	54, 77	oveqan12d 7274	. . . . . . . 8 ⊢ ((𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ) → ((𝑎↑2) + (𝑏↑2)) = ((if(0 ≤ 𝑎, 𝑎, -𝑎)↑2) + (if(0 ≤ 𝑏, 𝑏, -𝑏)↑2)))
79	78	eqeq2d 2749	. . . . . . 7 ⊢ ((𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ) → (𝑃 = ((𝑎↑2) + (𝑏↑2)) ↔ 𝑃 = ((if(0 ≤ 𝑎, 𝑎, -𝑎)↑2) + (if(0 ≤ 𝑏, 𝑏, -𝑏)↑2))))
80	79	biimpd 228	. . . . . 6 ⊢ ((𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ) → (𝑃 = ((𝑎↑2) + (𝑏↑2)) → 𝑃 = ((if(0 ≤ 𝑎, 𝑎, -𝑎)↑2) + (if(0 ≤ 𝑏, 𝑏, -𝑏)↑2))))
81	80	imp 406	. . . . 5 ⊢ (((𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ) ∧ 𝑃 = ((𝑎↑2) + (𝑏↑2))) → 𝑃 = ((if(0 ≤ 𝑎, 𝑎, -𝑎)↑2) + (if(0 ≤ 𝑏, 𝑏, -𝑏)↑2)))
82		oveq1 7262	. . . . . . . 8 ⊢ (𝑥 = if(0 ≤ 𝑎, 𝑎, -𝑎) → (𝑥↑2) = (if(0 ≤ 𝑎, 𝑎, -𝑎)↑2))
83	82	oveq1d 7270	. . . . . . 7 ⊢ (𝑥 = if(0 ≤ 𝑎, 𝑎, -𝑎) → ((𝑥↑2) + (𝑦↑2)) = ((if(0 ≤ 𝑎, 𝑎, -𝑎)↑2) + (𝑦↑2)))
84	83	eqeq2d 2749	. . . . . 6 ⊢ (𝑥 = if(0 ≤ 𝑎, 𝑎, -𝑎) → (𝑃 = ((𝑥↑2) + (𝑦↑2)) ↔ 𝑃 = ((if(0 ≤ 𝑎, 𝑎, -𝑎)↑2) + (𝑦↑2))))
85		oveq1 7262	. . . . . . . 8 ⊢ (𝑦 = if(0 ≤ 𝑏, 𝑏, -𝑏) → (𝑦↑2) = (if(0 ≤ 𝑏, 𝑏, -𝑏)↑2))
86	85	oveq2d 7271	. . . . . . 7 ⊢ (𝑦 = if(0 ≤ 𝑏, 𝑏, -𝑏) → ((if(0 ≤ 𝑎, 𝑎, -𝑎)↑2) + (𝑦↑2)) = ((if(0 ≤ 𝑎, 𝑎, -𝑎)↑2) + (if(0 ≤ 𝑏, 𝑏, -𝑏)↑2)))
87	86	eqeq2d 2749	. . . . . 6 ⊢ (𝑦 = if(0 ≤ 𝑏, 𝑏, -𝑏) → (𝑃 = ((if(0 ≤ 𝑎, 𝑎, -𝑎)↑2) + (𝑦↑2)) ↔ 𝑃 = ((if(0 ≤ 𝑎, 𝑎, -𝑎)↑2) + (if(0 ≤ 𝑏, 𝑏, -𝑏)↑2))))
88	84, 87	rspc2ev 3564	. . . . 5 ⊢ ((if(0 ≤ 𝑎, 𝑎, -𝑎) ∈ ℕ₀ ∧ if(0 ≤ 𝑏, 𝑏, -𝑏) ∈ ℕ₀ ∧ 𝑃 = ((if(0 ≤ 𝑎, 𝑎, -𝑎)↑2) + (if(0 ≤ 𝑏, 𝑏, -𝑏)↑2))) → ∃𝑥 ∈ ℕ₀ ∃𝑦 ∈ ℕ₀ 𝑃 = ((𝑥↑2) + (𝑦↑2)))
89	16, 31, 81, 88	syl3anc 1369	. . . 4 ⊢ (((𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ) ∧ 𝑃 = ((𝑎↑2) + (𝑏↑2))) → ∃𝑥 ∈ ℕ₀ ∃𝑦 ∈ ℕ₀ 𝑃 = ((𝑥↑2) + (𝑦↑2)))
90	89	ex 412	. . 3 ⊢ ((𝑎 ∈ ℤ ∧ 𝑏 ∈ ℤ) → (𝑃 = ((𝑎↑2) + (𝑏↑2)) → ∃𝑥 ∈ ℕ₀ ∃𝑦 ∈ ℕ₀ 𝑃 = ((𝑥↑2) + (𝑦↑2))))
91	90	rexlimivv 3220	. 2 ⊢ (∃𝑎 ∈ ℤ ∃𝑏 ∈ ℤ 𝑃 = ((𝑎↑2) + (𝑏↑2)) → ∃𝑥 ∈ ℕ₀ ∃𝑦 ∈ ℕ₀ 𝑃 = ((𝑥↑2) + (𝑦↑2)))
92	1, 91	syl 17	1 ⊢ ((𝑃 ∈ ℙ ∧ (𝑃 mod 4) = 1) → ∃𝑥 ∈ ℕ₀ ∃𝑦 ∈ ℕ₀ 𝑃 = ((𝑥↑2) + (𝑦↑2)))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ∧ wa 395 ∨ wo 843 = wceq 1539 ∈ wcel 2108 ∃wrex 3064 ifcif 4456 class class class wbr 5070 (class class class)co 7255 ℂcc 10800 ℝcr 10801 0cc0 10802 1c1 10803 + caddc 10805 < clt 10940 ≤ cle 10941 -cneg 11136 ℕcn 11903 2c2 11958 4c4 11960 ℕ₀cn0 12163 ℤcz 12249 mod cmo 13517 ↑cexp 13710 ℙcprime 16304

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-rep 5205 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 ax-cnex 10858 ax-resscn 10859 ax-1cn 10860 ax-icn 10861 ax-addcl 10862 ax-addrcl 10863 ax-mulcl 10864 ax-mulrcl 10865 ax-mulcom 10866 ax-addass 10867 ax-mulass 10868 ax-distr 10869 ax-i2m1 10870 ax-1ne0 10871 ax-1rid 10872 ax-rnegex 10873 ax-rrecex 10874 ax-cnre 10875 ax-pre-lttri 10876 ax-pre-lttrn 10877 ax-pre-ltadd 10878 ax-pre-mulgt0 10879 ax-pre-sup 10880 ax-addf 10881 ax-mulf 10882

This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-nel 3049 df-ral 3068 df-rex 3069 df-reu 3070 df-rmo 3071 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-pss 3902 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-tp 4563 df-op 4565 df-uni 4837 df-int 4877 df-iun 4923 df-iin 4924 df-br 5071 df-opab 5133 df-mpt 5154 df-tr 5188 df-id 5480 df-eprel 5486 df-po 5494 df-so 5495 df-fr 5535 df-se 5536 df-we 5537 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-pred 6191 df-ord 6254 df-on 6255 df-lim 6256 df-suc 6257 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-isom 6427 df-riota 7212 df-ov 7258 df-oprab 7259 df-mpo 7260 df-of 7511 df-ofr 7512 df-om 7688 df-1st 7804 df-2nd 7805 df-supp 7949 df-tpos 8013 df-frecs 8068 df-wrecs 8099 df-recs 8173 df-rdg 8212 df-1o 8267 df-2o 8268 df-oadd 8271 df-er 8456 df-ec 8458 df-qs 8462 df-map 8575 df-pm 8576 df-ixp 8644 df-en 8692 df-dom 8693 df-sdom 8694 df-fin 8695 df-fsupp 9059 df-sup 9131 df-inf 9132 df-oi 9199 df-dju 9590 df-card 9628 df-pnf 10942 df-mnf 10943 df-xr 10944 df-ltxr 10945 df-le 10946 df-sub 11137 df-neg 11138 df-div 11563 df-nn 11904 df-2 11966 df-3 11967 df-4 11968 df-5 11969 df-6 11970 df-7 11971 df-8 11972 df-9 11973 df-n0 12164 df-xnn0 12236 df-z 12250 df-dec 12367 df-uz 12512 df-q 12618 df-rp 12660 df-fz 13169 df-fzo 13312 df-fl 13440 df-mod 13518 df-seq 13650 df-exp 13711 df-hash 13973 df-cj 14738 df-re 14739 df-im 14740 df-sqrt 14874 df-abs 14875 df-dvds 15892 df-gcd 16130 df-prm 16305 df-phi 16395 df-pc 16466 df-gz 16559 df-struct 16776 df-sets 16793 df-slot 16811 df-ndx 16823 df-base 16841 df-ress 16868 df-plusg 16901 df-mulr 16902 df-starv 16903 df-sca 16904 df-vsca 16905 df-ip 16906 df-tset 16907 df-ple 16908 df-ds 16910 df-unif 16911 df-hom 16912 df-cco 16913 df-0g 17069 df-gsum 17070 df-prds 17075 df-pws 17077 df-imas 17136 df-qus 17137 df-mre 17212 df-mrc 17213 df-acs 17215 df-mgm 18241 df-sgrp 18290 df-mnd 18301 df-mhm 18345 df-submnd 18346 df-grp 18495 df-minusg 18496 df-sbg 18497 df-mulg 18616 df-subg 18667 df-nsg 18668 df-eqg 18669 df-ghm 18747 df-cntz 18838 df-cmn 19303 df-abl 19304 df-mgp 19636 df-ur 19653 df-srg 19657 df-ring 19700 df-cring 19701 df-oppr 19777 df-dvdsr 19798 df-unit 19799 df-invr 19829 df-dvr 19840 df-rnghom 19874 df-drng 19908 df-field 19909 df-subrg 19937 df-lmod 20040 df-lss 20109 df-lsp 20149 df-sra 20349 df-rgmod 20350 df-lidl 20351 df-rsp 20352 df-2idl 20416 df-nzr 20442 df-rlreg 20467 df-domn 20468 df-idom 20469 df-cnfld 20511 df-zring 20583 df-zrh 20617 df-zn 20620 df-assa 20970 df-asp 20971 df-ascl 20972 df-psr 21022 df-mvr 21023 df-mpl 21024 df-opsr 21026 df-evls 21192 df-evl 21193 df-psr1 21261 df-vr1 21262 df-ply1 21263 df-coe1 21264 df-evl1 21392 df-mdeg 25122 df-deg1 25123 df-mon1 25200 df-uc1p 25201 df-q1p 25202 df-r1p 25203 df-lgs 26348

This theorem is referenced by: 2sqnn 26492 2sqreulem1 26499

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