Theorem pythagtriplem19 16875

Description: Lemma for pythagtrip 16876. Introduce 𝑘 and remove the relative primality requirement. (Contributed by Scott Fenton, 18-Apr-2014.) (Revised by Mario Carneiro, 19-Apr-2014.)

Assertion

Ref	Expression
pythagtriplem19	⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2) ∧ ¬ 2 ∥ (𝐴 / (𝐴 gcd 𝐵))) → ∃𝑛 ∈ ℕ ∃𝑚 ∈ ℕ ∃𝑘 ∈ ℕ (𝐴 = (𝑘 · ((𝑚↑2) − (𝑛↑2))) ∧ 𝐵 = (𝑘 · (2 · (𝑚 · 𝑛))) ∧ 𝐶 = (𝑘 · ((𝑚↑2) + (𝑛↑2)))))

Distinct variable groups:   𝐴,𝑚,𝑛,𝑘   𝐵,𝑚,𝑛,𝑘   𝐶,𝑚,𝑛,𝑘

Proof of Theorem pythagtriplem19

Step	Hyp	Ref	Expression
1		gcdnncl 16547	. . . . 5 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) → (𝐴 gcd 𝐵) ∈ ℕ)
2	1	3adant3 1132	. . . 4 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → (𝐴 gcd 𝐵) ∈ ℕ)
3	2	3ad2ant1 1133	. . 3 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2) ∧ ¬ 2 ∥ (𝐴 / (𝐴 gcd 𝐵))) → (𝐴 gcd 𝐵) ∈ ℕ)
4		nnz 12656	. . . . . . . . . . 11 ⊢ (𝐴 ∈ ℕ → 𝐴 ∈ ℤ)
5		nnz 12656	. . . . . . . . . . 11 ⊢ (𝐵 ∈ ℕ → 𝐵 ∈ ℤ)
6		gcddvds 16543	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℤ ∧ 𝐵 ∈ ℤ) → ((𝐴 gcd 𝐵) ∥ 𝐴 ∧ (𝐴 gcd 𝐵) ∥ 𝐵))
7	4, 5, 6	syl2an 595	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) → ((𝐴 gcd 𝐵) ∥ 𝐴 ∧ (𝐴 gcd 𝐵) ∥ 𝐵))
8	7	3adant3 1132	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → ((𝐴 gcd 𝐵) ∥ 𝐴 ∧ (𝐴 gcd 𝐵) ∥ 𝐵))
9	8	simpld 494	. . . . . . . 8 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → (𝐴 gcd 𝐵) ∥ 𝐴)
10	2	nnzd 12662	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → (𝐴 gcd 𝐵) ∈ ℤ)
11	2	nnne0d 12339	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → (𝐴 gcd 𝐵) ≠ 0)
12	4	3ad2ant1 1133	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → 𝐴 ∈ ℤ)
13		dvdsval2 16299	. . . . . . . . 9 ⊢ (((𝐴 gcd 𝐵) ∈ ℤ ∧ (𝐴 gcd 𝐵) ≠ 0 ∧ 𝐴 ∈ ℤ) → ((𝐴 gcd 𝐵) ∥ 𝐴 ↔ (𝐴 / (𝐴 gcd 𝐵)) ∈ ℤ))
14	10, 11, 12, 13	syl3anc 1371	. . . . . . . 8 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → ((𝐴 gcd 𝐵) ∥ 𝐴 ↔ (𝐴 / (𝐴 gcd 𝐵)) ∈ ℤ))
15	9, 14	mpbid 232	. . . . . . 7 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → (𝐴 / (𝐴 gcd 𝐵)) ∈ ℤ)
16		nnre 12296	. . . . . . . . 9 ⊢ (𝐴 ∈ ℕ → 𝐴 ∈ ℝ)
17	16	3ad2ant1 1133	. . . . . . . 8 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → 𝐴 ∈ ℝ)
18	2	nnred 12304	. . . . . . . 8 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → (𝐴 gcd 𝐵) ∈ ℝ)
19		nngt0 12320	. . . . . . . . 9 ⊢ (𝐴 ∈ ℕ → 0 < 𝐴)
20	19	3ad2ant1 1133	. . . . . . . 8 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → 0 < 𝐴)
21	2	nngt0d 12338	. . . . . . . 8 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → 0 < (𝐴 gcd 𝐵))
22	17, 18, 20, 21	divgt0d 12226	. . . . . . 7 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → 0 < (𝐴 / (𝐴 gcd 𝐵)))
23		elnnz 12645	. . . . . . 7 ⊢ ((𝐴 / (𝐴 gcd 𝐵)) ∈ ℕ ↔ ((𝐴 / (𝐴 gcd 𝐵)) ∈ ℤ ∧ 0 < (𝐴 / (𝐴 gcd 𝐵))))
24	15, 22, 23	sylanbrc 582	. . . . . 6 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → (𝐴 / (𝐴 gcd 𝐵)) ∈ ℕ)
25	24	3ad2ant1 1133	. . . . 5 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2) ∧ ¬ 2 ∥ (𝐴 / (𝐴 gcd 𝐵))) → (𝐴 / (𝐴 gcd 𝐵)) ∈ ℕ)
26	8	simprd 495	. . . . . . . 8 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → (𝐴 gcd 𝐵) ∥ 𝐵)
27	5	3ad2ant2 1134	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → 𝐵 ∈ ℤ)
28		dvdsval2 16299	. . . . . . . . 9 ⊢ (((𝐴 gcd 𝐵) ∈ ℤ ∧ (𝐴 gcd 𝐵) ≠ 0 ∧ 𝐵 ∈ ℤ) → ((𝐴 gcd 𝐵) ∥ 𝐵 ↔ (𝐵 / (𝐴 gcd 𝐵)) ∈ ℤ))
29	10, 11, 27, 28	syl3anc 1371	. . . . . . . 8 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → ((𝐴 gcd 𝐵) ∥ 𝐵 ↔ (𝐵 / (𝐴 gcd 𝐵)) ∈ ℤ))
30	26, 29	mpbid 232	. . . . . . 7 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → (𝐵 / (𝐴 gcd 𝐵)) ∈ ℤ)
31		nnre 12296	. . . . . . . . 9 ⊢ (𝐵 ∈ ℕ → 𝐵 ∈ ℝ)
32	31	3ad2ant2 1134	. . . . . . . 8 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → 𝐵 ∈ ℝ)
33		nngt0 12320	. . . . . . . . 9 ⊢ (𝐵 ∈ ℕ → 0 < 𝐵)
34	33	3ad2ant2 1134	. . . . . . . 8 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → 0 < 𝐵)
35	32, 18, 34, 21	divgt0d 12226	. . . . . . 7 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → 0 < (𝐵 / (𝐴 gcd 𝐵)))
36		elnnz 12645	. . . . . . 7 ⊢ ((𝐵 / (𝐴 gcd 𝐵)) ∈ ℕ ↔ ((𝐵 / (𝐴 gcd 𝐵)) ∈ ℤ ∧ 0 < (𝐵 / (𝐴 gcd 𝐵))))
37	30, 35, 36	sylanbrc 582	. . . . . 6 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → (𝐵 / (𝐴 gcd 𝐵)) ∈ ℕ)
38	37	3ad2ant1 1133	. . . . 5 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2) ∧ ¬ 2 ∥ (𝐴 / (𝐴 gcd 𝐵))) → (𝐵 / (𝐴 gcd 𝐵)) ∈ ℕ)
39		dvdssq 16608	. . . . . . . . . . . . . . 15 ⊢ (((𝐴 gcd 𝐵) ∈ ℤ ∧ 𝐴 ∈ ℤ) → ((𝐴 gcd 𝐵) ∥ 𝐴 ↔ ((𝐴 gcd 𝐵)↑2) ∥ (𝐴↑2)))
40	10, 12, 39	syl2anc 583	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → ((𝐴 gcd 𝐵) ∥ 𝐴 ↔ ((𝐴 gcd 𝐵)↑2) ∥ (𝐴↑2)))
41		dvdssq 16608	. . . . . . . . . . . . . . 15 ⊢ (((𝐴 gcd 𝐵) ∈ ℤ ∧ 𝐵 ∈ ℤ) → ((𝐴 gcd 𝐵) ∥ 𝐵 ↔ ((𝐴 gcd 𝐵)↑2) ∥ (𝐵↑2)))
42	10, 27, 41	syl2anc 583	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → ((𝐴 gcd 𝐵) ∥ 𝐵 ↔ ((𝐴 gcd 𝐵)↑2) ∥ (𝐵↑2)))
43	40, 42	anbi12d 631	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → (((𝐴 gcd 𝐵) ∥ 𝐴 ∧ (𝐴 gcd 𝐵) ∥ 𝐵) ↔ (((𝐴 gcd 𝐵)↑2) ∥ (𝐴↑2) ∧ ((𝐴 gcd 𝐵)↑2) ∥ (𝐵↑2))))
44	8, 43	mpbid 232	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → (((𝐴 gcd 𝐵)↑2) ∥ (𝐴↑2) ∧ ((𝐴 gcd 𝐵)↑2) ∥ (𝐵↑2)))
45	2	nnsqcld 14289	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → ((𝐴 gcd 𝐵)↑2) ∈ ℕ)
46	45	nnzd 12662	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → ((𝐴 gcd 𝐵)↑2) ∈ ℤ)
47		nnsqcl 14174	. . . . . . . . . . . . . . 15 ⊢ (𝐴 ∈ ℕ → (𝐴↑2) ∈ ℕ)
48	47	3ad2ant1 1133	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → (𝐴↑2) ∈ ℕ)
49	48	nnzd 12662	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → (𝐴↑2) ∈ ℤ)
50		nnsqcl 14174	. . . . . . . . . . . . . . 15 ⊢ (𝐵 ∈ ℕ → (𝐵↑2) ∈ ℕ)
51	50	3ad2ant2 1134	. . . . . . . . . . . . . 14 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → (𝐵↑2) ∈ ℕ)
52	51	nnzd 12662	. . . . . . . . . . . . 13 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → (𝐵↑2) ∈ ℤ)
53		dvds2add 16332	. . . . . . . . . . . . 13 ⊢ ((((𝐴 gcd 𝐵)↑2) ∈ ℤ ∧ (𝐴↑2) ∈ ℤ ∧ (𝐵↑2) ∈ ℤ) → ((((𝐴 gcd 𝐵)↑2) ∥ (𝐴↑2) ∧ ((𝐴 gcd 𝐵)↑2) ∥ (𝐵↑2)) → ((𝐴 gcd 𝐵)↑2) ∥ ((𝐴↑2) + (𝐵↑2))))
54	46, 49, 52, 53	syl3anc 1371	. . . . . . . . . . . 12 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → ((((𝐴 gcd 𝐵)↑2) ∥ (𝐴↑2) ∧ ((𝐴 gcd 𝐵)↑2) ∥ (𝐵↑2)) → ((𝐴 gcd 𝐵)↑2) ∥ ((𝐴↑2) + (𝐵↑2))))
55	44, 54	mpd 15	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → ((𝐴 gcd 𝐵)↑2) ∥ ((𝐴↑2) + (𝐵↑2)))
56	55	adantr 480	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2)) → ((𝐴 gcd 𝐵)↑2) ∥ ((𝐴↑2) + (𝐵↑2)))
57		simpr 484	. . . . . . . . . 10 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2)) → ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2))
58	56, 57	breqtrd 5195	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2)) → ((𝐴 gcd 𝐵)↑2) ∥ (𝐶↑2))
59		nnz 12656	. . . . . . . . . . . 12 ⊢ (𝐶 ∈ ℕ → 𝐶 ∈ ℤ)
60	59	3ad2ant3 1135	. . . . . . . . . . 11 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → 𝐶 ∈ ℤ)
61		dvdssq 16608	. . . . . . . . . . 11 ⊢ (((𝐴 gcd 𝐵) ∈ ℤ ∧ 𝐶 ∈ ℤ) → ((𝐴 gcd 𝐵) ∥ 𝐶 ↔ ((𝐴 gcd 𝐵)↑2) ∥ (𝐶↑2)))
62	10, 60, 61	syl2anc 583	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → ((𝐴 gcd 𝐵) ∥ 𝐶 ↔ ((𝐴 gcd 𝐵)↑2) ∥ (𝐶↑2)))
63	62	adantr 480	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2)) → ((𝐴 gcd 𝐵) ∥ 𝐶 ↔ ((𝐴 gcd 𝐵)↑2) ∥ (𝐶↑2)))
64	58, 63	mpbird 257	. . . . . . . 8 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2)) → (𝐴 gcd 𝐵) ∥ 𝐶)
65		dvdsval2 16299	. . . . . . . . . 10 ⊢ (((𝐴 gcd 𝐵) ∈ ℤ ∧ (𝐴 gcd 𝐵) ≠ 0 ∧ 𝐶 ∈ ℤ) → ((𝐴 gcd 𝐵) ∥ 𝐶 ↔ (𝐶 / (𝐴 gcd 𝐵)) ∈ ℤ))
66	10, 11, 60, 65	syl3anc 1371	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → ((𝐴 gcd 𝐵) ∥ 𝐶 ↔ (𝐶 / (𝐴 gcd 𝐵)) ∈ ℤ))
67	66	adantr 480	. . . . . . . 8 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2)) → ((𝐴 gcd 𝐵) ∥ 𝐶 ↔ (𝐶 / (𝐴 gcd 𝐵)) ∈ ℤ))
68	64, 67	mpbid 232	. . . . . . 7 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2)) → (𝐶 / (𝐴 gcd 𝐵)) ∈ ℤ)
69		nnre 12296	. . . . . . . . . 10 ⊢ (𝐶 ∈ ℕ → 𝐶 ∈ ℝ)
70	69	3ad2ant3 1135	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → 𝐶 ∈ ℝ)
71		nngt0 12320	. . . . . . . . . 10 ⊢ (𝐶 ∈ ℕ → 0 < 𝐶)
72	71	3ad2ant3 1135	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → 0 < 𝐶)
73	70, 18, 72, 21	divgt0d 12226	. . . . . . . 8 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → 0 < (𝐶 / (𝐴 gcd 𝐵)))
74	73	adantr 480	. . . . . . 7 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2)) → 0 < (𝐶 / (𝐴 gcd 𝐵)))
75		elnnz 12645	. . . . . . 7 ⊢ ((𝐶 / (𝐴 gcd 𝐵)) ∈ ℕ ↔ ((𝐶 / (𝐴 gcd 𝐵)) ∈ ℤ ∧ 0 < (𝐶 / (𝐴 gcd 𝐵))))
76	68, 74, 75	sylanbrc 582	. . . . . 6 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2)) → (𝐶 / (𝐴 gcd 𝐵)) ∈ ℕ)
77	76	3adant3 1132	. . . . 5 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2) ∧ ¬ 2 ∥ (𝐴 / (𝐴 gcd 𝐵))) → (𝐶 / (𝐴 gcd 𝐵)) ∈ ℕ)
78	48	nncnd 12305	. . . . . . . 8 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → (𝐴↑2) ∈ ℂ)
79	51	nncnd 12305	. . . . . . . 8 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → (𝐵↑2) ∈ ℂ)
80	45	nncnd 12305	. . . . . . . 8 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → ((𝐴 gcd 𝐵)↑2) ∈ ℂ)
81	45	nnne0d 12339	. . . . . . . 8 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → ((𝐴 gcd 𝐵)↑2) ≠ 0)
82	78, 79, 80, 81	divdird 12104	. . . . . . 7 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → (((𝐴↑2) + (𝐵↑2)) / ((𝐴 gcd 𝐵)↑2)) = (((𝐴↑2) / ((𝐴 gcd 𝐵)↑2)) + ((𝐵↑2) / ((𝐴 gcd 𝐵)↑2))))
83	82	3ad2ant1 1133	. . . . . 6 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2) ∧ ¬ 2 ∥ (𝐴 / (𝐴 gcd 𝐵))) → (((𝐴↑2) + (𝐵↑2)) / ((𝐴 gcd 𝐵)↑2)) = (((𝐴↑2) / ((𝐴 gcd 𝐵)↑2)) + ((𝐵↑2) / ((𝐴 gcd 𝐵)↑2))))
84		nncn 12297	. . . . . . . . . 10 ⊢ (𝐶 ∈ ℕ → 𝐶 ∈ ℂ)
85	84	3ad2ant3 1135	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → 𝐶 ∈ ℂ)
86	2	nncnd 12305	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → (𝐴 gcd 𝐵) ∈ ℂ)
87	85, 86, 11	sqdivd 14205	. . . . . . . 8 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → ((𝐶 / (𝐴 gcd 𝐵))↑2) = ((𝐶↑2) / ((𝐴 gcd 𝐵)↑2)))
88	87	3ad2ant1 1133	. . . . . . 7 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2) ∧ ¬ 2 ∥ (𝐴 / (𝐴 gcd 𝐵))) → ((𝐶 / (𝐴 gcd 𝐵))↑2) = ((𝐶↑2) / ((𝐴 gcd 𝐵)↑2)))
89		oveq1 7452	. . . . . . . 8 ⊢ (((𝐴↑2) + (𝐵↑2)) = (𝐶↑2) → (((𝐴↑2) + (𝐵↑2)) / ((𝐴 gcd 𝐵)↑2)) = ((𝐶↑2) / ((𝐴 gcd 𝐵)↑2)))
90	89	3ad2ant2 1134	. . . . . . 7 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2) ∧ ¬ 2 ∥ (𝐴 / (𝐴 gcd 𝐵))) → (((𝐴↑2) + (𝐵↑2)) / ((𝐴 gcd 𝐵)↑2)) = ((𝐶↑2) / ((𝐴 gcd 𝐵)↑2)))
91	88, 90	eqtr4d 2777	. . . . . 6 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2) ∧ ¬ 2 ∥ (𝐴 / (𝐴 gcd 𝐵))) → ((𝐶 / (𝐴 gcd 𝐵))↑2) = (((𝐴↑2) + (𝐵↑2)) / ((𝐴 gcd 𝐵)↑2)))
92		nncn 12297	. . . . . . . . . 10 ⊢ (𝐴 ∈ ℕ → 𝐴 ∈ ℂ)
93	92	3ad2ant1 1133	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → 𝐴 ∈ ℂ)
94	93, 86, 11	sqdivd 14205	. . . . . . . 8 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → ((𝐴 / (𝐴 gcd 𝐵))↑2) = ((𝐴↑2) / ((𝐴 gcd 𝐵)↑2)))
95		nncn 12297	. . . . . . . . . 10 ⊢ (𝐵 ∈ ℕ → 𝐵 ∈ ℂ)
96	95	3ad2ant2 1134	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → 𝐵 ∈ ℂ)
97	96, 86, 11	sqdivd 14205	. . . . . . . 8 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → ((𝐵 / (𝐴 gcd 𝐵))↑2) = ((𝐵↑2) / ((𝐴 gcd 𝐵)↑2)))
98	94, 97	oveq12d 7463	. . . . . . 7 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → (((𝐴 / (𝐴 gcd 𝐵))↑2) + ((𝐵 / (𝐴 gcd 𝐵))↑2)) = (((𝐴↑2) / ((𝐴 gcd 𝐵)↑2)) + ((𝐵↑2) / ((𝐴 gcd 𝐵)↑2))))
99	98	3ad2ant1 1133	. . . . . 6 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2) ∧ ¬ 2 ∥ (𝐴 / (𝐴 gcd 𝐵))) → (((𝐴 / (𝐴 gcd 𝐵))↑2) + ((𝐵 / (𝐴 gcd 𝐵))↑2)) = (((𝐴↑2) / ((𝐴 gcd 𝐵)↑2)) + ((𝐵↑2) / ((𝐴 gcd 𝐵)↑2))))
100	83, 91, 99	3eqtr4rd 2785	. . . . 5 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2) ∧ ¬ 2 ∥ (𝐴 / (𝐴 gcd 𝐵))) → (((𝐴 / (𝐴 gcd 𝐵))↑2) + ((𝐵 / (𝐴 gcd 𝐵))↑2)) = ((𝐶 / (𝐴 gcd 𝐵))↑2))
101		gcddiv 16592	. . . . . . . 8 ⊢ (((𝐴 ∈ ℤ ∧ 𝐵 ∈ ℤ ∧ (𝐴 gcd 𝐵) ∈ ℕ) ∧ ((𝐴 gcd 𝐵) ∥ 𝐴 ∧ (𝐴 gcd 𝐵) ∥ 𝐵)) → ((𝐴 gcd 𝐵) / (𝐴 gcd 𝐵)) = ((𝐴 / (𝐴 gcd 𝐵)) gcd (𝐵 / (𝐴 gcd 𝐵))))
102	12, 27, 2, 8, 101	syl31anc 1373	. . . . . . 7 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → ((𝐴 gcd 𝐵) / (𝐴 gcd 𝐵)) = ((𝐴 / (𝐴 gcd 𝐵)) gcd (𝐵 / (𝐴 gcd 𝐵))))
103	86, 11	dividd 12064	. . . . . . 7 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → ((𝐴 gcd 𝐵) / (𝐴 gcd 𝐵)) = 1)
104	102, 103	eqtr3d 2776	. . . . . 6 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → ((𝐴 / (𝐴 gcd 𝐵)) gcd (𝐵 / (𝐴 gcd 𝐵))) = 1)
105	104	3ad2ant1 1133	. . . . 5 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2) ∧ ¬ 2 ∥ (𝐴 / (𝐴 gcd 𝐵))) → ((𝐴 / (𝐴 gcd 𝐵)) gcd (𝐵 / (𝐴 gcd 𝐵))) = 1)
106		simp3 1138	. . . . 5 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2) ∧ ¬ 2 ∥ (𝐴 / (𝐴 gcd 𝐵))) → ¬ 2 ∥ (𝐴 / (𝐴 gcd 𝐵)))
107		pythagtriplem18 16874	. . . . 5 ⊢ ((((𝐴 / (𝐴 gcd 𝐵)) ∈ ℕ ∧ (𝐵 / (𝐴 gcd 𝐵)) ∈ ℕ ∧ (𝐶 / (𝐴 gcd 𝐵)) ∈ ℕ) ∧ (((𝐴 / (𝐴 gcd 𝐵))↑2) + ((𝐵 / (𝐴 gcd 𝐵))↑2)) = ((𝐶 / (𝐴 gcd 𝐵))↑2) ∧ (((𝐴 / (𝐴 gcd 𝐵)) gcd (𝐵 / (𝐴 gcd 𝐵))) = 1 ∧ ¬ 2 ∥ (𝐴 / (𝐴 gcd 𝐵)))) → ∃𝑛 ∈ ℕ ∃𝑚 ∈ ℕ ((𝐴 / (𝐴 gcd 𝐵)) = ((𝑚↑2) − (𝑛↑2)) ∧ (𝐵 / (𝐴 gcd 𝐵)) = (2 · (𝑚 · 𝑛)) ∧ (𝐶 / (𝐴 gcd 𝐵)) = ((𝑚↑2) + (𝑛↑2))))
108	25, 38, 77, 100, 105, 106, 107	syl312anc 1391	. . . 4 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2) ∧ ¬ 2 ∥ (𝐴 / (𝐴 gcd 𝐵))) → ∃𝑛 ∈ ℕ ∃𝑚 ∈ ℕ ((𝐴 / (𝐴 gcd 𝐵)) = ((𝑚↑2) − (𝑛↑2)) ∧ (𝐵 / (𝐴 gcd 𝐵)) = (2 · (𝑚 · 𝑛)) ∧ (𝐶 / (𝐴 gcd 𝐵)) = ((𝑚↑2) + (𝑛↑2))))
109	93, 86, 11	divcan2d 12068	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → ((𝐴 gcd 𝐵) · (𝐴 / (𝐴 gcd 𝐵))) = 𝐴)
110	109	eqcomd 2740	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → 𝐴 = ((𝐴 gcd 𝐵) · (𝐴 / (𝐴 gcd 𝐵))))
111	96, 86, 11	divcan2d 12068	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → ((𝐴 gcd 𝐵) · (𝐵 / (𝐴 gcd 𝐵))) = 𝐵)
112	111	eqcomd 2740	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → 𝐵 = ((𝐴 gcd 𝐵) · (𝐵 / (𝐴 gcd 𝐵))))
113	85, 86, 11	divcan2d 12068	. . . . . . . . . 10 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → ((𝐴 gcd 𝐵) · (𝐶 / (𝐴 gcd 𝐵))) = 𝐶)
114	113	eqcomd 2740	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → 𝐶 = ((𝐴 gcd 𝐵) · (𝐶 / (𝐴 gcd 𝐵))))
115	110, 112, 114	3jca 1128	. . . . . . . 8 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) → (𝐴 = ((𝐴 gcd 𝐵) · (𝐴 / (𝐴 gcd 𝐵))) ∧ 𝐵 = ((𝐴 gcd 𝐵) · (𝐵 / (𝐴 gcd 𝐵))) ∧ 𝐶 = ((𝐴 gcd 𝐵) · (𝐶 / (𝐴 gcd 𝐵)))))
116	115	3ad2ant1 1133	. . . . . . 7 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2) ∧ ¬ 2 ∥ (𝐴 / (𝐴 gcd 𝐵))) → (𝐴 = ((𝐴 gcd 𝐵) · (𝐴 / (𝐴 gcd 𝐵))) ∧ 𝐵 = ((𝐴 gcd 𝐵) · (𝐵 / (𝐴 gcd 𝐵))) ∧ 𝐶 = ((𝐴 gcd 𝐵) · (𝐶 / (𝐴 gcd 𝐵)))))
117		oveq2 7453	. . . . . . . . . 10 ⊢ ((𝐴 / (𝐴 gcd 𝐵)) = ((𝑚↑2) − (𝑛↑2)) → ((𝐴 gcd 𝐵) · (𝐴 / (𝐴 gcd 𝐵))) = ((𝐴 gcd 𝐵) · ((𝑚↑2) − (𝑛↑2))))
118	117	eqeq2d 2745	. . . . . . . . 9 ⊢ ((𝐴 / (𝐴 gcd 𝐵)) = ((𝑚↑2) − (𝑛↑2)) → (𝐴 = ((𝐴 gcd 𝐵) · (𝐴 / (𝐴 gcd 𝐵))) ↔ 𝐴 = ((𝐴 gcd 𝐵) · ((𝑚↑2) − (𝑛↑2)))))
119	118	3ad2ant1 1133	. . . . . . . 8 ⊢ (((𝐴 / (𝐴 gcd 𝐵)) = ((𝑚↑2) − (𝑛↑2)) ∧ (𝐵 / (𝐴 gcd 𝐵)) = (2 · (𝑚 · 𝑛)) ∧ (𝐶 / (𝐴 gcd 𝐵)) = ((𝑚↑2) + (𝑛↑2))) → (𝐴 = ((𝐴 gcd 𝐵) · (𝐴 / (𝐴 gcd 𝐵))) ↔ 𝐴 = ((𝐴 gcd 𝐵) · ((𝑚↑2) − (𝑛↑2)))))
120		oveq2 7453	. . . . . . . . . 10 ⊢ ((𝐵 / (𝐴 gcd 𝐵)) = (2 · (𝑚 · 𝑛)) → ((𝐴 gcd 𝐵) · (𝐵 / (𝐴 gcd 𝐵))) = ((𝐴 gcd 𝐵) · (2 · (𝑚 · 𝑛))))
121	120	eqeq2d 2745	. . . . . . . . 9 ⊢ ((𝐵 / (𝐴 gcd 𝐵)) = (2 · (𝑚 · 𝑛)) → (𝐵 = ((𝐴 gcd 𝐵) · (𝐵 / (𝐴 gcd 𝐵))) ↔ 𝐵 = ((𝐴 gcd 𝐵) · (2 · (𝑚 · 𝑛)))))
122	121	3ad2ant2 1134	. . . . . . . 8 ⊢ (((𝐴 / (𝐴 gcd 𝐵)) = ((𝑚↑2) − (𝑛↑2)) ∧ (𝐵 / (𝐴 gcd 𝐵)) = (2 · (𝑚 · 𝑛)) ∧ (𝐶 / (𝐴 gcd 𝐵)) = ((𝑚↑2) + (𝑛↑2))) → (𝐵 = ((𝐴 gcd 𝐵) · (𝐵 / (𝐴 gcd 𝐵))) ↔ 𝐵 = ((𝐴 gcd 𝐵) · (2 · (𝑚 · 𝑛)))))
123		oveq2 7453	. . . . . . . . . 10 ⊢ ((𝐶 / (𝐴 gcd 𝐵)) = ((𝑚↑2) + (𝑛↑2)) → ((𝐴 gcd 𝐵) · (𝐶 / (𝐴 gcd 𝐵))) = ((𝐴 gcd 𝐵) · ((𝑚↑2) + (𝑛↑2))))
124	123	eqeq2d 2745	. . . . . . . . 9 ⊢ ((𝐶 / (𝐴 gcd 𝐵)) = ((𝑚↑2) + (𝑛↑2)) → (𝐶 = ((𝐴 gcd 𝐵) · (𝐶 / (𝐴 gcd 𝐵))) ↔ 𝐶 = ((𝐴 gcd 𝐵) · ((𝑚↑2) + (𝑛↑2)))))
125	124	3ad2ant3 1135	. . . . . . . 8 ⊢ (((𝐴 / (𝐴 gcd 𝐵)) = ((𝑚↑2) − (𝑛↑2)) ∧ (𝐵 / (𝐴 gcd 𝐵)) = (2 · (𝑚 · 𝑛)) ∧ (𝐶 / (𝐴 gcd 𝐵)) = ((𝑚↑2) + (𝑛↑2))) → (𝐶 = ((𝐴 gcd 𝐵) · (𝐶 / (𝐴 gcd 𝐵))) ↔ 𝐶 = ((𝐴 gcd 𝐵) · ((𝑚↑2) + (𝑛↑2)))))
126	119, 122, 125	3anbi123d 1436	. . . . . . 7 ⊢ (((𝐴 / (𝐴 gcd 𝐵)) = ((𝑚↑2) − (𝑛↑2)) ∧ (𝐵 / (𝐴 gcd 𝐵)) = (2 · (𝑚 · 𝑛)) ∧ (𝐶 / (𝐴 gcd 𝐵)) = ((𝑚↑2) + (𝑛↑2))) → ((𝐴 = ((𝐴 gcd 𝐵) · (𝐴 / (𝐴 gcd 𝐵))) ∧ 𝐵 = ((𝐴 gcd 𝐵) · (𝐵 / (𝐴 gcd 𝐵))) ∧ 𝐶 = ((𝐴 gcd 𝐵) · (𝐶 / (𝐴 gcd 𝐵)))) ↔ (𝐴 = ((𝐴 gcd 𝐵) · ((𝑚↑2) − (𝑛↑2))) ∧ 𝐵 = ((𝐴 gcd 𝐵) · (2 · (𝑚 · 𝑛))) ∧ 𝐶 = ((𝐴 gcd 𝐵) · ((𝑚↑2) + (𝑛↑2))))))
127	116, 126	syl5ibcom 245	. . . . . 6 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2) ∧ ¬ 2 ∥ (𝐴 / (𝐴 gcd 𝐵))) → (((𝐴 / (𝐴 gcd 𝐵)) = ((𝑚↑2) − (𝑛↑2)) ∧ (𝐵 / (𝐴 gcd 𝐵)) = (2 · (𝑚 · 𝑛)) ∧ (𝐶 / (𝐴 gcd 𝐵)) = ((𝑚↑2) + (𝑛↑2))) → (𝐴 = ((𝐴 gcd 𝐵) · ((𝑚↑2) − (𝑛↑2))) ∧ 𝐵 = ((𝐴 gcd 𝐵) · (2 · (𝑚 · 𝑛))) ∧ 𝐶 = ((𝐴 gcd 𝐵) · ((𝑚↑2) + (𝑛↑2))))))
128	127	reximdv 3172	. . . . 5 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2) ∧ ¬ 2 ∥ (𝐴 / (𝐴 gcd 𝐵))) → (∃𝑚 ∈ ℕ ((𝐴 / (𝐴 gcd 𝐵)) = ((𝑚↑2) − (𝑛↑2)) ∧ (𝐵 / (𝐴 gcd 𝐵)) = (2 · (𝑚 · 𝑛)) ∧ (𝐶 / (𝐴 gcd 𝐵)) = ((𝑚↑2) + (𝑛↑2))) → ∃𝑚 ∈ ℕ (𝐴 = ((𝐴 gcd 𝐵) · ((𝑚↑2) − (𝑛↑2))) ∧ 𝐵 = ((𝐴 gcd 𝐵) · (2 · (𝑚 · 𝑛))) ∧ 𝐶 = ((𝐴 gcd 𝐵) · ((𝑚↑2) + (𝑛↑2))))))
129	128	reximdv 3172	. . . 4 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2) ∧ ¬ 2 ∥ (𝐴 / (𝐴 gcd 𝐵))) → (∃𝑛 ∈ ℕ ∃𝑚 ∈ ℕ ((𝐴 / (𝐴 gcd 𝐵)) = ((𝑚↑2) − (𝑛↑2)) ∧ (𝐵 / (𝐴 gcd 𝐵)) = (2 · (𝑚 · 𝑛)) ∧ (𝐶 / (𝐴 gcd 𝐵)) = ((𝑚↑2) + (𝑛↑2))) → ∃𝑛 ∈ ℕ ∃𝑚 ∈ ℕ (𝐴 = ((𝐴 gcd 𝐵) · ((𝑚↑2) − (𝑛↑2))) ∧ 𝐵 = ((𝐴 gcd 𝐵) · (2 · (𝑚 · 𝑛))) ∧ 𝐶 = ((𝐴 gcd 𝐵) · ((𝑚↑2) + (𝑛↑2))))))
130	108, 129	mpd 15	. . 3 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2) ∧ ¬ 2 ∥ (𝐴 / (𝐴 gcd 𝐵))) → ∃𝑛 ∈ ℕ ∃𝑚 ∈ ℕ (𝐴 = ((𝐴 gcd 𝐵) · ((𝑚↑2) − (𝑛↑2))) ∧ 𝐵 = ((𝐴 gcd 𝐵) · (2 · (𝑚 · 𝑛))) ∧ 𝐶 = ((𝐴 gcd 𝐵) · ((𝑚↑2) + (𝑛↑2)))))
131		oveq1 7452	. . . . . . 7 ⊢ (𝑘 = (𝐴 gcd 𝐵) → (𝑘 · ((𝑚↑2) − (𝑛↑2))) = ((𝐴 gcd 𝐵) · ((𝑚↑2) − (𝑛↑2))))
132	131	eqeq2d 2745	. . . . . 6 ⊢ (𝑘 = (𝐴 gcd 𝐵) → (𝐴 = (𝑘 · ((𝑚↑2) − (𝑛↑2))) ↔ 𝐴 = ((𝐴 gcd 𝐵) · ((𝑚↑2) − (𝑛↑2)))))
133		oveq1 7452	. . . . . . 7 ⊢ (𝑘 = (𝐴 gcd 𝐵) → (𝑘 · (2 · (𝑚 · 𝑛))) = ((𝐴 gcd 𝐵) · (2 · (𝑚 · 𝑛))))
134	133	eqeq2d 2745	. . . . . 6 ⊢ (𝑘 = (𝐴 gcd 𝐵) → (𝐵 = (𝑘 · (2 · (𝑚 · 𝑛))) ↔ 𝐵 = ((𝐴 gcd 𝐵) · (2 · (𝑚 · 𝑛)))))
135		oveq1 7452	. . . . . . 7 ⊢ (𝑘 = (𝐴 gcd 𝐵) → (𝑘 · ((𝑚↑2) + (𝑛↑2))) = ((𝐴 gcd 𝐵) · ((𝑚↑2) + (𝑛↑2))))
136	135	eqeq2d 2745	. . . . . 6 ⊢ (𝑘 = (𝐴 gcd 𝐵) → (𝐶 = (𝑘 · ((𝑚↑2) + (𝑛↑2))) ↔ 𝐶 = ((𝐴 gcd 𝐵) · ((𝑚↑2) + (𝑛↑2)))))
137	132, 134, 136	3anbi123d 1436	. . . . 5 ⊢ (𝑘 = (𝐴 gcd 𝐵) → ((𝐴 = (𝑘 · ((𝑚↑2) − (𝑛↑2))) ∧ 𝐵 = (𝑘 · (2 · (𝑚 · 𝑛))) ∧ 𝐶 = (𝑘 · ((𝑚↑2) + (𝑛↑2)))) ↔ (𝐴 = ((𝐴 gcd 𝐵) · ((𝑚↑2) − (𝑛↑2))) ∧ 𝐵 = ((𝐴 gcd 𝐵) · (2 · (𝑚 · 𝑛))) ∧ 𝐶 = ((𝐴 gcd 𝐵) · ((𝑚↑2) + (𝑛↑2))))))
138	137	2rexbidv 3223	. . . 4 ⊢ (𝑘 = (𝐴 gcd 𝐵) → (∃𝑛 ∈ ℕ ∃𝑚 ∈ ℕ (𝐴 = (𝑘 · ((𝑚↑2) − (𝑛↑2))) ∧ 𝐵 = (𝑘 · (2 · (𝑚 · 𝑛))) ∧ 𝐶 = (𝑘 · ((𝑚↑2) + (𝑛↑2)))) ↔ ∃𝑛 ∈ ℕ ∃𝑚 ∈ ℕ (𝐴 = ((𝐴 gcd 𝐵) · ((𝑚↑2) − (𝑛↑2))) ∧ 𝐵 = ((𝐴 gcd 𝐵) · (2 · (𝑚 · 𝑛))) ∧ 𝐶 = ((𝐴 gcd 𝐵) · ((𝑚↑2) + (𝑛↑2))))))
139	138	rspcev 3631	. . 3 ⊢ (((𝐴 gcd 𝐵) ∈ ℕ ∧ ∃𝑛 ∈ ℕ ∃𝑚 ∈ ℕ (𝐴 = ((𝐴 gcd 𝐵) · ((𝑚↑2) − (𝑛↑2))) ∧ 𝐵 = ((𝐴 gcd 𝐵) · (2 · (𝑚 · 𝑛))) ∧ 𝐶 = ((𝐴 gcd 𝐵) · ((𝑚↑2) + (𝑛↑2))))) → ∃𝑘 ∈ ℕ ∃𝑛 ∈ ℕ ∃𝑚 ∈ ℕ (𝐴 = (𝑘 · ((𝑚↑2) − (𝑛↑2))) ∧ 𝐵 = (𝑘 · (2 · (𝑚 · 𝑛))) ∧ 𝐶 = (𝑘 · ((𝑚↑2) + (𝑛↑2)))))
140	3, 130, 139	syl2anc 583	. 2 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2) ∧ ¬ 2 ∥ (𝐴 / (𝐴 gcd 𝐵))) → ∃𝑘 ∈ ℕ ∃𝑛 ∈ ℕ ∃𝑚 ∈ ℕ (𝐴 = (𝑘 · ((𝑚↑2) − (𝑛↑2))) ∧ 𝐵 = (𝑘 · (2 · (𝑚 · 𝑛))) ∧ 𝐶 = (𝑘 · ((𝑚↑2) + (𝑛↑2)))))
141		rexcom 3291	. . 3 ⊢ (∃𝑘 ∈ ℕ ∃𝑛 ∈ ℕ ∃𝑚 ∈ ℕ (𝐴 = (𝑘 · ((𝑚↑2) − (𝑛↑2))) ∧ 𝐵 = (𝑘 · (2 · (𝑚 · 𝑛))) ∧ 𝐶 = (𝑘 · ((𝑚↑2) + (𝑛↑2)))) ↔ ∃𝑛 ∈ ℕ ∃𝑘 ∈ ℕ ∃𝑚 ∈ ℕ (𝐴 = (𝑘 · ((𝑚↑2) − (𝑛↑2))) ∧ 𝐵 = (𝑘 · (2 · (𝑚 · 𝑛))) ∧ 𝐶 = (𝑘 · ((𝑚↑2) + (𝑛↑2)))))
142		rexcom 3291	. . . 4 ⊢ (∃𝑘 ∈ ℕ ∃𝑚 ∈ ℕ (𝐴 = (𝑘 · ((𝑚↑2) − (𝑛↑2))) ∧ 𝐵 = (𝑘 · (2 · (𝑚 · 𝑛))) ∧ 𝐶 = (𝑘 · ((𝑚↑2) + (𝑛↑2)))) ↔ ∃𝑚 ∈ ℕ ∃𝑘 ∈ ℕ (𝐴 = (𝑘 · ((𝑚↑2) − (𝑛↑2))) ∧ 𝐵 = (𝑘 · (2 · (𝑚 · 𝑛))) ∧ 𝐶 = (𝑘 · ((𝑚↑2) + (𝑛↑2)))))
143	142	rexbii 3096	. . 3 ⊢ (∃𝑛 ∈ ℕ ∃𝑘 ∈ ℕ ∃𝑚 ∈ ℕ (𝐴 = (𝑘 · ((𝑚↑2) − (𝑛↑2))) ∧ 𝐵 = (𝑘 · (2 · (𝑚 · 𝑛))) ∧ 𝐶 = (𝑘 · ((𝑚↑2) + (𝑛↑2)))) ↔ ∃𝑛 ∈ ℕ ∃𝑚 ∈ ℕ ∃𝑘 ∈ ℕ (𝐴 = (𝑘 · ((𝑚↑2) − (𝑛↑2))) ∧ 𝐵 = (𝑘 · (2 · (𝑚 · 𝑛))) ∧ 𝐶 = (𝑘 · ((𝑚↑2) + (𝑛↑2)))))
144	141, 143	bitri 275	. 2 ⊢ (∃𝑘 ∈ ℕ ∃𝑛 ∈ ℕ ∃𝑚 ∈ ℕ (𝐴 = (𝑘 · ((𝑚↑2) − (𝑛↑2))) ∧ 𝐵 = (𝑘 · (2 · (𝑚 · 𝑛))) ∧ 𝐶 = (𝑘 · ((𝑚↑2) + (𝑛↑2)))) ↔ ∃𝑛 ∈ ℕ ∃𝑚 ∈ ℕ ∃𝑘 ∈ ℕ (𝐴 = (𝑘 · ((𝑚↑2) − (𝑛↑2))) ∧ 𝐵 = (𝑘 · (2 · (𝑚 · 𝑛))) ∧ 𝐶 = (𝑘 · ((𝑚↑2) + (𝑛↑2)))))
145	140, 144	sylib 218	1 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ ∧ 𝐶 ∈ ℕ) ∧ ((𝐴↑2) + (𝐵↑2)) = (𝐶↑2) ∧ ¬ 2 ∥ (𝐴 / (𝐴 gcd 𝐵))) → ∃𝑛 ∈ ℕ ∃𝑚 ∈ ℕ ∃𝑘 ∈ ℕ (𝐴 = (𝑘 · ((𝑚↑2) − (𝑛↑2))) ∧ 𝐵 = (𝑘 · (2 · (𝑚 · 𝑛))) ∧ 𝐶 = (𝑘 · ((𝑚↑2) + (𝑛↑2)))))

Syntax hints:  ¬ wn 3   → wi 4   ↔ wb 206   ∧ wa 395   ∧ w3a 1087   = wceq 1537   ∈ wcel 2103   ≠ wne 2942  ∃wrex 3072   class class class wbr 5169  (class class class)co 7445  ℂcc 11178  ℝcr 11179  0cc0 11180  1c1 11181   + caddc 11183   · cmul 11185   < clt 11320   − cmin 11516   / cdiv 11943  ℕcn 12289  2c2 12344  ℤcz 12635  ↑cexp 14108   ∥ cdvds 16296   gcd cgcd 16534

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 2105  ax-9 2113  ax-10 2136  ax-11 2153  ax-12 2173  ax-ext 2705  ax-sep 5320  ax-nul 5327  ax-pow 5386  ax-pr 5450  ax-un 7766  ax-cnex 11236  ax-resscn 11237  ax-1cn 11238  ax-icn 11239  ax-addcl 11240  ax-addrcl 11241  ax-mulcl 11242  ax-mulrcl 11243  ax-mulcom 11244  ax-addass 11245  ax-mulass 11246  ax-distr 11247  ax-i2m1 11248  ax-1ne0 11249  ax-1rid 11250  ax-rnegex 11251  ax-rrecex 11252  ax-cnre 11253  ax-pre-lttri 11254  ax-pre-lttrn 11255  ax-pre-ltadd 11256  ax-pre-mulgt0 11257  ax-pre-sup 11258

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 2537  df-eu 2566  df-clab 2712  df-cleq 2726  df-clel 2813  df-nfc 2890  df-ne 2943  df-nel 3049  df-ral 3064  df-rex 3073  df-rmo 3383  df-reu 3384  df-rab 3439  df-v 3484  df-sbc 3799  df-csb 3916  df-dif 3973  df-un 3975  df-in 3977  df-ss 3987  df-pss 3990  df-nul 4348  df-if 4549  df-pw 4624  df-sn 4649  df-pr 4651  df-op 4655  df-uni 4932  df-iun 5021  df-br 5170  df-opab 5232  df-mpt 5253  df-tr 5287  df-id 5597  df-eprel 5603  df-po 5611  df-so 5612  df-fr 5654  df-we 5656  df-xp 5705  df-rel 5706  df-cnv 5707  df-co 5708  df-dm 5709  df-rn 5710  df-res 5711  df-ima 5712  df-pred 6331  df-ord 6397  df-on 6398  df-lim 6399  df-suc 6400  df-iota 6524  df-fun 6574  df-fn 6575  df-f 6576  df-f1 6577  df-fo 6578  df-f1o 6579  df-fv 6580  df-riota 7401  df-ov 7448  df-oprab 7449  df-mpo 7450  df-om 7900  df-1st 8026  df-2nd 8027  df-frecs 8318  df-wrecs 8349  df-recs 8423  df-rdg 8462  df-1o 8518  df-2o 8519  df-er 8759  df-en 9000  df-dom 9001  df-sdom 9002  df-fin 9003  df-sup 9507  df-inf 9508  df-pnf 11322  df-mnf 11323  df-xr 11324  df-ltxr 11325  df-le 11326  df-sub 11518  df-neg 11519  df-div 11944  df-nn 12290  df-2 12352  df-3 12353  df-n0 12550  df-z 12636  df-uz 12900  df-rp 13054  df-fz 13564  df-fl 13839  df-mod 13917  df-seq 14049  df-exp 14109  df-cj 15144  df-re 15145  df-im 15146  df-sqrt 15280  df-abs 15281  df-dvds 16297  df-gcd 16535  df-prm 16713

This theorem is referenced by:  pythagtrip  16876