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Theorem dfgcd2 15310
Description: Alternate definition of the gcd operator, see definition in [ApostolNT] p. 15. (Contributed by AV, 8-Aug-2021.)
Assertion
Ref Expression
dfgcd2 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝐷 = (𝑀 gcd 𝑁) ↔ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷))))
Distinct variable groups:   𝐷,𝑒   𝑒,𝑀   𝑒,𝑁

Proof of Theorem dfgcd2
Dummy variables 𝑛 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 gcdcl 15275 . . . . . 6 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 gcd 𝑁) ∈ ℕ0)
21nn0ge0d 11392 . . . . 5 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → 0 ≤ (𝑀 gcd 𝑁))
3 gcddvds 15272 . . . . 5 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((𝑀 gcd 𝑁) ∥ 𝑀 ∧ (𝑀 gcd 𝑁) ∥ 𝑁))
4 3anass 1059 . . . . . . . 8 ((𝑒 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ↔ (𝑒 ∈ ℤ ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)))
5 ancom 465 . . . . . . . 8 ((𝑒 ∈ ℤ ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) ↔ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑒 ∈ ℤ))
64, 5bitri 264 . . . . . . 7 ((𝑒 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ↔ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑒 ∈ ℤ))
7 dvdsgcd 15308 . . . . . . 7 ((𝑒 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((𝑒𝑀𝑒𝑁) → 𝑒 ∥ (𝑀 gcd 𝑁)))
86, 7sylbir 225 . . . . . 6 (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑒 ∈ ℤ) → ((𝑒𝑀𝑒𝑁) → 𝑒 ∥ (𝑀 gcd 𝑁)))
98ralrimiva 2995 . . . . 5 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒 ∥ (𝑀 gcd 𝑁)))
102, 3, 93jca 1261 . . . 4 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (0 ≤ (𝑀 gcd 𝑁) ∧ ((𝑀 gcd 𝑁) ∥ 𝑀 ∧ (𝑀 gcd 𝑁) ∥ 𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒 ∥ (𝑀 gcd 𝑁))))
1110adantr 480 . . 3 (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝐷 = (𝑀 gcd 𝑁)) → (0 ≤ (𝑀 gcd 𝑁) ∧ ((𝑀 gcd 𝑁) ∥ 𝑀 ∧ (𝑀 gcd 𝑁) ∥ 𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒 ∥ (𝑀 gcd 𝑁))))
12 breq2 4689 . . . . 5 (𝐷 = (𝑀 gcd 𝑁) → (0 ≤ 𝐷 ↔ 0 ≤ (𝑀 gcd 𝑁)))
13 breq1 4688 . . . . . 6 (𝐷 = (𝑀 gcd 𝑁) → (𝐷𝑀 ↔ (𝑀 gcd 𝑁) ∥ 𝑀))
14 breq1 4688 . . . . . 6 (𝐷 = (𝑀 gcd 𝑁) → (𝐷𝑁 ↔ (𝑀 gcd 𝑁) ∥ 𝑁))
1513, 14anbi12d 747 . . . . 5 (𝐷 = (𝑀 gcd 𝑁) → ((𝐷𝑀𝐷𝑁) ↔ ((𝑀 gcd 𝑁) ∥ 𝑀 ∧ (𝑀 gcd 𝑁) ∥ 𝑁)))
16 breq2 4689 . . . . . . 7 (𝐷 = (𝑀 gcd 𝑁) → (𝑒𝐷𝑒 ∥ (𝑀 gcd 𝑁)))
1716imbi2d 329 . . . . . 6 (𝐷 = (𝑀 gcd 𝑁) → (((𝑒𝑀𝑒𝑁) → 𝑒𝐷) ↔ ((𝑒𝑀𝑒𝑁) → 𝑒 ∥ (𝑀 gcd 𝑁))))
1817ralbidv 3015 . . . . 5 (𝐷 = (𝑀 gcd 𝑁) → (∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷) ↔ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒 ∥ (𝑀 gcd 𝑁))))
1912, 15, 183anbi123d 1439 . . . 4 (𝐷 = (𝑀 gcd 𝑁) → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)) ↔ (0 ≤ (𝑀 gcd 𝑁) ∧ ((𝑀 gcd 𝑁) ∥ 𝑀 ∧ (𝑀 gcd 𝑁) ∥ 𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒 ∥ (𝑀 gcd 𝑁)))))
2019adantl 481 . . 3 (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝐷 = (𝑀 gcd 𝑁)) → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)) ↔ (0 ≤ (𝑀 gcd 𝑁) ∧ ((𝑀 gcd 𝑁) ∥ 𝑀 ∧ (𝑀 gcd 𝑁) ∥ 𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒 ∥ (𝑀 gcd 𝑁)))))
2111, 20mpbird 247 . 2 (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝐷 = (𝑀 gcd 𝑁)) → (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))
22 gcdval 15265 . . . 4 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 gcd 𝑁) = if((𝑀 = 0 ∧ 𝑁 = 0), 0, sup({𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)}, ℝ, < )))
2322adantr 480 . . 3 (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷))) → (𝑀 gcd 𝑁) = if((𝑀 = 0 ∧ 𝑁 = 0), 0, sup({𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)}, ℝ, < )))
24 iftrue 4125 . . . . . 6 ((𝑀 = 0 ∧ 𝑁 = 0) → if((𝑀 = 0 ∧ 𝑁 = 0), 0, sup({𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)}, ℝ, < )) = 0)
2524adantr 480 . . . . 5 (((𝑀 = 0 ∧ 𝑁 = 0) ∧ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))) → if((𝑀 = 0 ∧ 𝑁 = 0), 0, sup({𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)}, ℝ, < )) = 0)
26 breq2 4689 . . . . . . . . . 10 (𝑀 = 0 → (𝐷𝑀𝐷 ∥ 0))
27 breq2 4689 . . . . . . . . . 10 (𝑁 = 0 → (𝐷𝑁𝐷 ∥ 0))
2826, 27bi2anan9 935 . . . . . . . . 9 ((𝑀 = 0 ∧ 𝑁 = 0) → ((𝐷𝑀𝐷𝑁) ↔ (𝐷 ∥ 0 ∧ 𝐷 ∥ 0)))
29 breq2 4689 . . . . . . . . . . . 12 (𝑀 = 0 → (𝑒𝑀𝑒 ∥ 0))
30 breq2 4689 . . . . . . . . . . . 12 (𝑁 = 0 → (𝑒𝑁𝑒 ∥ 0))
3129, 30bi2anan9 935 . . . . . . . . . . 11 ((𝑀 = 0 ∧ 𝑁 = 0) → ((𝑒𝑀𝑒𝑁) ↔ (𝑒 ∥ 0 ∧ 𝑒 ∥ 0)))
3231imbi1d 330 . . . . . . . . . 10 ((𝑀 = 0 ∧ 𝑁 = 0) → (((𝑒𝑀𝑒𝑁) → 𝑒𝐷) ↔ ((𝑒 ∥ 0 ∧ 𝑒 ∥ 0) → 𝑒𝐷)))
3332ralbidv 3015 . . . . . . . . 9 ((𝑀 = 0 ∧ 𝑁 = 0) → (∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷) ↔ ∀𝑒 ∈ ℤ ((𝑒 ∥ 0 ∧ 𝑒 ∥ 0) → 𝑒𝐷)))
3428, 333anbi23d 1442 . . . . . . . 8 ((𝑀 = 0 ∧ 𝑁 = 0) → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)) ↔ (0 ≤ 𝐷 ∧ (𝐷 ∥ 0 ∧ 𝐷 ∥ 0) ∧ ∀𝑒 ∈ ℤ ((𝑒 ∥ 0 ∧ 𝑒 ∥ 0) → 𝑒𝐷))))
35 dvdszrcl 15032 . . . . . . . . . . . 12 (𝐷 ∥ 0 → (𝐷 ∈ ℤ ∧ 0 ∈ ℤ))
36 dvds0 15044 . . . . . . . . . . . . . . . . . . 19 (𝑒 ∈ ℤ → 𝑒 ∥ 0)
3736, 36jca 553 . . . . . . . . . . . . . . . . . 18 (𝑒 ∈ ℤ → (𝑒 ∥ 0 ∧ 𝑒 ∥ 0))
3837adantl 481 . . . . . . . . . . . . . . . . 17 (((𝐷 ∈ ℤ ∧ 0 ≤ 𝐷) ∧ 𝑒 ∈ ℤ) → (𝑒 ∥ 0 ∧ 𝑒 ∥ 0))
39 pm5.5 350 . . . . . . . . . . . . . . . . 17 ((𝑒 ∥ 0 ∧ 𝑒 ∥ 0) → (((𝑒 ∥ 0 ∧ 𝑒 ∥ 0) → 𝑒𝐷) ↔ 𝑒𝐷))
4038, 39syl 17 . . . . . . . . . . . . . . . 16 (((𝐷 ∈ ℤ ∧ 0 ≤ 𝐷) ∧ 𝑒 ∈ ℤ) → (((𝑒 ∥ 0 ∧ 𝑒 ∥ 0) → 𝑒𝐷) ↔ 𝑒𝐷))
4140ralbidva 3014 . . . . . . . . . . . . . . 15 ((𝐷 ∈ ℤ ∧ 0 ≤ 𝐷) → (∀𝑒 ∈ ℤ ((𝑒 ∥ 0 ∧ 𝑒 ∥ 0) → 𝑒𝐷) ↔ ∀𝑒 ∈ ℤ 𝑒𝐷))
42 0z 11426 . . . . . . . . . . . . . . . . . 18 0 ∈ ℤ
43 breq1 4688 . . . . . . . . . . . . . . . . . . 19 (𝑒 = 0 → (𝑒𝐷 ↔ 0 ∥ 𝐷))
4443rspcv 3336 . . . . . . . . . . . . . . . . . 18 (0 ∈ ℤ → (∀𝑒 ∈ ℤ 𝑒𝐷 → 0 ∥ 𝐷))
4542, 44ax-mp 5 . . . . . . . . . . . . . . . . 17 (∀𝑒 ∈ ℤ 𝑒𝐷 → 0 ∥ 𝐷)
46 0dvds 15049 . . . . . . . . . . . . . . . . . . 19 (𝐷 ∈ ℤ → (0 ∥ 𝐷𝐷 = 0))
4746biimpd 219 . . . . . . . . . . . . . . . . . 18 (𝐷 ∈ ℤ → (0 ∥ 𝐷𝐷 = 0))
48 eqcom 2658 . . . . . . . . . . . . . . . . . 18 (0 = 𝐷𝐷 = 0)
4947, 48syl6ibr 242 . . . . . . . . . . . . . . . . 17 (𝐷 ∈ ℤ → (0 ∥ 𝐷 → 0 = 𝐷))
5045, 49syl5 34 . . . . . . . . . . . . . . . 16 (𝐷 ∈ ℤ → (∀𝑒 ∈ ℤ 𝑒𝐷 → 0 = 𝐷))
5150adantr 480 . . . . . . . . . . . . . . 15 ((𝐷 ∈ ℤ ∧ 0 ≤ 𝐷) → (∀𝑒 ∈ ℤ 𝑒𝐷 → 0 = 𝐷))
5241, 51sylbid 230 . . . . . . . . . . . . . 14 ((𝐷 ∈ ℤ ∧ 0 ≤ 𝐷) → (∀𝑒 ∈ ℤ ((𝑒 ∥ 0 ∧ 𝑒 ∥ 0) → 𝑒𝐷) → 0 = 𝐷))
5352ex 449 . . . . . . . . . . . . 13 (𝐷 ∈ ℤ → (0 ≤ 𝐷 → (∀𝑒 ∈ ℤ ((𝑒 ∥ 0 ∧ 𝑒 ∥ 0) → 𝑒𝐷) → 0 = 𝐷)))
5453adantr 480 . . . . . . . . . . . 12 ((𝐷 ∈ ℤ ∧ 0 ∈ ℤ) → (0 ≤ 𝐷 → (∀𝑒 ∈ ℤ ((𝑒 ∥ 0 ∧ 𝑒 ∥ 0) → 𝑒𝐷) → 0 = 𝐷)))
5535, 54syl 17 . . . . . . . . . . 11 (𝐷 ∥ 0 → (0 ≤ 𝐷 → (∀𝑒 ∈ ℤ ((𝑒 ∥ 0 ∧ 𝑒 ∥ 0) → 𝑒𝐷) → 0 = 𝐷)))
5655adantr 480 . . . . . . . . . 10 ((𝐷 ∥ 0 ∧ 𝐷 ∥ 0) → (0 ≤ 𝐷 → (∀𝑒 ∈ ℤ ((𝑒 ∥ 0 ∧ 𝑒 ∥ 0) → 𝑒𝐷) → 0 = 𝐷)))
5756com12 32 . . . . . . . . 9 (0 ≤ 𝐷 → ((𝐷 ∥ 0 ∧ 𝐷 ∥ 0) → (∀𝑒 ∈ ℤ ((𝑒 ∥ 0 ∧ 𝑒 ∥ 0) → 𝑒𝐷) → 0 = 𝐷)))
58573imp 1275 . . . . . . . 8 ((0 ≤ 𝐷 ∧ (𝐷 ∥ 0 ∧ 𝐷 ∥ 0) ∧ ∀𝑒 ∈ ℤ ((𝑒 ∥ 0 ∧ 𝑒 ∥ 0) → 𝑒𝐷)) → 0 = 𝐷)
5934, 58syl6bi 243 . . . . . . 7 ((𝑀 = 0 ∧ 𝑁 = 0) → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)) → 0 = 𝐷))
6059adantld 482 . . . . . 6 ((𝑀 = 0 ∧ 𝑁 = 0) → (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷))) → 0 = 𝐷))
6160imp 444 . . . . 5 (((𝑀 = 0 ∧ 𝑁 = 0) ∧ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))) → 0 = 𝐷)
6225, 61eqtrd 2685 . . . 4 (((𝑀 = 0 ∧ 𝑁 = 0) ∧ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))) → if((𝑀 = 0 ∧ 𝑁 = 0), 0, sup({𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)}, ℝ, < )) = 𝐷)
63 iffalse 4128 . . . . . 6 (¬ (𝑀 = 0 ∧ 𝑁 = 0) → if((𝑀 = 0 ∧ 𝑁 = 0), 0, sup({𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)}, ℝ, < )) = sup({𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)}, ℝ, < ))
6463adantr 480 . . . . 5 ((¬ (𝑀 = 0 ∧ 𝑁 = 0) ∧ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))) → if((𝑀 = 0 ∧ 𝑁 = 0), 0, sup({𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)}, ℝ, < )) = sup({𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)}, ℝ, < ))
65 ltso 10156 . . . . . . 7 < Or ℝ
6665a1i 11 . . . . . 6 ((¬ (𝑀 = 0 ∧ 𝑁 = 0) ∧ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))) → < Or ℝ)
67 dvdszrcl 15032 . . . . . . . . . . 11 (𝐷𝑀 → (𝐷 ∈ ℤ ∧ 𝑀 ∈ ℤ))
6867simpld 474 . . . . . . . . . 10 (𝐷𝑀𝐷 ∈ ℤ)
6968zred 11520 . . . . . . . . 9 (𝐷𝑀𝐷 ∈ ℝ)
7069adantr 480 . . . . . . . 8 ((𝐷𝑀𝐷𝑁) → 𝐷 ∈ ℝ)
71703ad2ant2 1103 . . . . . . 7 ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)) → 𝐷 ∈ ℝ)
7271ad2antll 765 . . . . . 6 ((¬ (𝑀 = 0 ∧ 𝑁 = 0) ∧ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))) → 𝐷 ∈ ℝ)
73 breq1 4688 . . . . . . . . . 10 (𝑛 = 𝑦 → (𝑛𝑀𝑦𝑀))
74 breq1 4688 . . . . . . . . . 10 (𝑛 = 𝑦 → (𝑛𝑁𝑦𝑁))
7573, 74anbi12d 747 . . . . . . . . 9 (𝑛 = 𝑦 → ((𝑛𝑀𝑛𝑁) ↔ (𝑦𝑀𝑦𝑁)))
7675elrab 3396 . . . . . . . 8 (𝑦 ∈ {𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)} ↔ (𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)))
77 breq1 4688 . . . . . . . . . . . . . . . . . . . . 21 (𝑒 = 𝑦 → (𝑒𝑀𝑦𝑀))
78 breq1 4688 . . . . . . . . . . . . . . . . . . . . 21 (𝑒 = 𝑦 → (𝑒𝑁𝑦𝑁))
7977, 78anbi12d 747 . . . . . . . . . . . . . . . . . . . 20 (𝑒 = 𝑦 → ((𝑒𝑀𝑒𝑁) ↔ (𝑦𝑀𝑦𝑁)))
80 breq1 4688 . . . . . . . . . . . . . . . . . . . 20 (𝑒 = 𝑦 → (𝑒𝐷𝑦𝐷))
8179, 80imbi12d 333 . . . . . . . . . . . . . . . . . . 19 (𝑒 = 𝑦 → (((𝑒𝑀𝑒𝑁) → 𝑒𝐷) ↔ ((𝑦𝑀𝑦𝑁) → 𝑦𝐷)))
8281rspcv 3336 . . . . . . . . . . . . . . . . . 18 (𝑦 ∈ ℤ → (∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷) → ((𝑦𝑀𝑦𝑁) → 𝑦𝐷)))
8382com23 86 . . . . . . . . . . . . . . . . 17 (𝑦 ∈ ℤ → ((𝑦𝑀𝑦𝑁) → (∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷) → 𝑦𝐷)))
8483imp 444 . . . . . . . . . . . . . . . 16 ((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) → (∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷) → 𝑦𝐷))
8584ad2antrr 762 . . . . . . . . . . . . . . 15 ((((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷) → 𝑦𝐷))
86 elnn0z 11428 . . . . . . . . . . . . . . . . . . . . . . 23 (𝐷 ∈ ℕ0 ↔ (𝐷 ∈ ℤ ∧ 0 ≤ 𝐷))
8786simplbi2 654 . . . . . . . . . . . . . . . . . . . . . 22 (𝐷 ∈ ℤ → (0 ≤ 𝐷𝐷 ∈ ℕ0))
8887adantr 480 . . . . . . . . . . . . . . . . . . . . 21 ((𝐷 ∈ ℤ ∧ 𝑀 ∈ ℤ) → (0 ≤ 𝐷𝐷 ∈ ℕ0))
8967, 88syl 17 . . . . . . . . . . . . . . . . . . . 20 (𝐷𝑀 → (0 ≤ 𝐷𝐷 ∈ ℕ0))
9089adantr 480 . . . . . . . . . . . . . . . . . . 19 ((𝐷𝑀𝐷𝑁) → (0 ≤ 𝐷𝐷 ∈ ℕ0))
9190impcom 445 . . . . . . . . . . . . . . . . . 18 ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → 𝐷 ∈ ℕ0)
92 simp-4l 823 . . . . . . . . . . . . . . . . . . . . . . . . . 26 (((((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) ∧ 𝐷 ∈ ℕ0) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁))) → 𝑦 ∈ ℤ)
93 elnn0 11332 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 (𝐷 ∈ ℕ0 ↔ (𝐷 ∈ ℕ ∨ 𝐷 = 0))
94 2a1 28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 (𝐷 ∈ ℕ → (((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → 𝐷 ∈ ℕ)))
95 breq1 4688 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 (𝐷 = 0 → (𝐷𝑀 ↔ 0 ∥ 𝑀))
96 breq1 4688 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 (𝐷 = 0 → (𝐷𝑁 ↔ 0 ∥ 𝑁))
9795, 96anbi12d 747 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 (𝐷 = 0 → ((𝐷𝑀𝐷𝑁) ↔ (0 ∥ 𝑀 ∧ 0 ∥ 𝑁)))
9897anbi2d 740 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 (𝐷 = 0 → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) ↔ (0 ≤ 𝐷 ∧ (0 ∥ 𝑀 ∧ 0 ∥ 𝑁))))
9998adantr 480 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 ((𝐷 = 0 ∧ ((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0))) → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) ↔ (0 ≤ 𝐷 ∧ (0 ∥ 𝑀 ∧ 0 ∥ 𝑁))))
100 ianor 508 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 (¬ (𝑀 = 0 ∧ 𝑁 = 0) ↔ (¬ 𝑀 = 0 ∨ ¬ 𝑁 = 0))
101 dvdszrcl 15032 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 (0 ∥ 𝑀 → (0 ∈ ℤ ∧ 𝑀 ∈ ℤ))
102 0dvds 15049 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 (𝑀 ∈ ℤ → (0 ∥ 𝑀𝑀 = 0))
103 pm2.24 121 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 (𝑀 = 0 → (¬ 𝑀 = 0 → 𝐷 ∈ ℕ))
104102, 103syl6bi 243 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 (𝑀 ∈ ℤ → (0 ∥ 𝑀 → (¬ 𝑀 = 0 → 𝐷 ∈ ℕ)))
105104adantl 481 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 ((0 ∈ ℤ ∧ 𝑀 ∈ ℤ) → (0 ∥ 𝑀 → (¬ 𝑀 = 0 → 𝐷 ∈ ℕ)))
106101, 105mpcom 38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 (0 ∥ 𝑀 → (¬ 𝑀 = 0 → 𝐷 ∈ ℕ))
107106adantr 480 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 ((0 ∥ 𝑀 ∧ 0 ∥ 𝑁) → (¬ 𝑀 = 0 → 𝐷 ∈ ℕ))
108107com12 32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 𝑀 = 0 → ((0 ∥ 𝑀 ∧ 0 ∥ 𝑁) → 𝐷 ∈ ℕ))
109 dvdszrcl 15032 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 (0 ∥ 𝑁 → (0 ∈ ℤ ∧ 𝑁 ∈ ℤ))
110 0dvds 15049 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 (𝑁 ∈ ℤ → (0 ∥ 𝑁𝑁 = 0))
111 pm2.24 121 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 (𝑁 = 0 → (¬ 𝑁 = 0 → 𝐷 ∈ ℕ))
112110, 111syl6bi 243 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 (𝑁 ∈ ℤ → (0 ∥ 𝑁 → (¬ 𝑁 = 0 → 𝐷 ∈ ℕ)))
113112adantl 481 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 ((0 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (0 ∥ 𝑁 → (¬ 𝑁 = 0 → 𝐷 ∈ ℕ)))
114109, 113mpcom 38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 (0 ∥ 𝑁 → (¬ 𝑁 = 0 → 𝐷 ∈ ℕ))
115114adantl 481 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 ((0 ∥ 𝑀 ∧ 0 ∥ 𝑁) → (¬ 𝑁 = 0 → 𝐷 ∈ ℕ))
116115com12 32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 𝑁 = 0 → ((0 ∥ 𝑀 ∧ 0 ∥ 𝑁) → 𝐷 ∈ ℕ))
117108, 116jaoi 393 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 ((¬ 𝑀 = 0 ∨ ¬ 𝑁 = 0) → ((0 ∥ 𝑀 ∧ 0 ∥ 𝑁) → 𝐷 ∈ ℕ))
118100, 117sylbi 207 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 (¬ (𝑀 = 0 ∧ 𝑁 = 0) → ((0 ∥ 𝑀 ∧ 0 ∥ 𝑁) → 𝐷 ∈ ℕ))
119118adantld 482 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 (¬ (𝑀 = 0 ∧ 𝑁 = 0) → ((0 ≤ 𝐷 ∧ (0 ∥ 𝑀 ∧ 0 ∥ 𝑁)) → 𝐷 ∈ ℕ))
120119ad2antll 765 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 ((𝐷 = 0 ∧ ((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0))) → ((0 ≤ 𝐷 ∧ (0 ∥ 𝑀 ∧ 0 ∥ 𝑁)) → 𝐷 ∈ ℕ))
12199, 120sylbid 230 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 ((𝐷 = 0 ∧ ((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0))) → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → 𝐷 ∈ ℕ))
122121ex 449 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 (𝐷 = 0 → (((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → 𝐷 ∈ ℕ)))
12394, 122jaoi 393 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ((𝐷 ∈ ℕ ∨ 𝐷 = 0) → (((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → 𝐷 ∈ ℕ)))
12493, 123sylbi 207 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 (𝐷 ∈ ℕ0 → (((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → 𝐷 ∈ ℕ)))
125124impcom 445 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 ((((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) ∧ 𝐷 ∈ ℕ0) → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → 𝐷 ∈ ℕ))
126125imp 444 . . . . . . . . . . . . . . . . . . . . . . . . . 26 (((((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) ∧ 𝐷 ∈ ℕ0) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁))) → 𝐷 ∈ ℕ)
127 dvdsle 15079 . . . . . . . . . . . . . . . . . . . . . . . . . 26 ((𝑦 ∈ ℤ ∧ 𝐷 ∈ ℕ) → (𝑦𝐷𝑦𝐷))
12892, 126, 127syl2anc 694 . . . . . . . . . . . . . . . . . . . . . . . . 25 (((((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) ∧ 𝐷 ∈ ℕ0) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁))) → (𝑦𝐷𝑦𝐷))
129128exp31 629 . . . . . . . . . . . . . . . . . . . . . . . 24 (((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) → (𝐷 ∈ ℕ0 → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → (𝑦𝐷𝑦𝐷))))
130129com14 96 . . . . . . . . . . . . . . . . . . . . . . 23 (𝑦𝐷 → (𝐷 ∈ ℕ0 → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → (((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) → 𝑦𝐷))))
131130imp 444 . . . . . . . . . . . . . . . . . . . . . 22 ((𝑦𝐷𝐷 ∈ ℕ0) → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → (((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) → 𝑦𝐷)))
132131impcom 445 . . . . . . . . . . . . . . . . . . . . 21 (((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) ∧ (𝑦𝐷𝐷 ∈ ℕ0)) → (((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) → 𝑦𝐷))
133132imp 444 . . . . . . . . . . . . . . . . . . . 20 ((((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) ∧ (𝑦𝐷𝐷 ∈ ℕ0)) ∧ ((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0))) → 𝑦𝐷)
134 zre 11419 . . . . . . . . . . . . . . . . . . . . . 22 (𝑦 ∈ ℤ → 𝑦 ∈ ℝ)
135134ad2antrr 762 . . . . . . . . . . . . . . . . . . . . 21 (((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) → 𝑦 ∈ ℝ)
13670ad2antlr 763 . . . . . . . . . . . . . . . . . . . . 21 (((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) ∧ (𝑦𝐷𝐷 ∈ ℕ0)) → 𝐷 ∈ ℝ)
137 lenlt 10154 . . . . . . . . . . . . . . . . . . . . 21 ((𝑦 ∈ ℝ ∧ 𝐷 ∈ ℝ) → (𝑦𝐷 ↔ ¬ 𝐷 < 𝑦))
138135, 136, 137syl2anr 494 . . . . . . . . . . . . . . . . . . . 20 ((((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) ∧ (𝑦𝐷𝐷 ∈ ℕ0)) ∧ ((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0))) → (𝑦𝐷 ↔ ¬ 𝐷 < 𝑦))
139133, 138mpbid 222 . . . . . . . . . . . . . . . . . . 19 ((((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) ∧ (𝑦𝐷𝐷 ∈ ℕ0)) ∧ ((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0))) → ¬ 𝐷 < 𝑦)
140139exp31 629 . . . . . . . . . . . . . . . . . 18 ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → ((𝑦𝐷𝐷 ∈ ℕ0) → (((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) → ¬ 𝐷 < 𝑦)))
14191, 140mpan2d 710 . . . . . . . . . . . . . . . . 17 ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → (𝑦𝐷 → (((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) → ¬ 𝐷 < 𝑦)))
142141com13 88 . . . . . . . . . . . . . . . 16 (((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) → (𝑦𝐷 → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → ¬ 𝐷 < 𝑦)))
143142adantr 480 . . . . . . . . . . . . . . 15 ((((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (𝑦𝐷 → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → ¬ 𝐷 < 𝑦)))
14485, 143syld 47 . . . . . . . . . . . . . 14 ((((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷) → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → ¬ 𝐷 < 𝑦)))
145144com13 88 . . . . . . . . . . . . 13 ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → (∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷) → ((((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → ¬ 𝐷 < 𝑦)))
146145ex 449 . . . . . . . . . . . 12 (0 ≤ 𝐷 → ((𝐷𝑀𝐷𝑁) → (∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷) → ((((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → ¬ 𝐷 < 𝑦))))
1471463imp 1275 . . . . . . . . . . 11 ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)) → ((((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → ¬ 𝐷 < 𝑦))
148147com12 32 . . . . . . . . . 10 ((((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)) → ¬ 𝐷 < 𝑦))
149148expimpd 628 . . . . . . . . 9 (((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) → (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷))) → ¬ 𝐷 < 𝑦))
150149expimpd 628 . . . . . . . 8 ((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) → ((¬ (𝑀 = 0 ∧ 𝑁 = 0) ∧ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))) → ¬ 𝐷 < 𝑦))
15176, 150sylbi 207 . . . . . . 7 (𝑦 ∈ {𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)} → ((¬ (𝑀 = 0 ∧ 𝑁 = 0) ∧ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))) → ¬ 𝐷 < 𝑦))
152151impcom 445 . . . . . 6 (((¬ (𝑀 = 0 ∧ 𝑁 = 0) ∧ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))) ∧ 𝑦 ∈ {𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)}) → ¬ 𝐷 < 𝑦)
15368adantr 480 . . . . . . . . . . . 12 ((𝐷𝑀𝐷𝑁) → 𝐷 ∈ ℤ)
154153ancri 574 . . . . . . . . . . 11 ((𝐷𝑀𝐷𝑁) → (𝐷 ∈ ℤ ∧ (𝐷𝑀𝐷𝑁)))
1551543ad2ant2 1103 . . . . . . . . . 10 ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)) → (𝐷 ∈ ℤ ∧ (𝐷𝑀𝐷𝑁)))
156155ad2antll 765 . . . . . . . . 9 ((¬ (𝑀 = 0 ∧ 𝑁 = 0) ∧ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))) → (𝐷 ∈ ℤ ∧ (𝐷𝑀𝐷𝑁)))
157156adantr 480 . . . . . . . 8 (((¬ (𝑀 = 0 ∧ 𝑁 = 0) ∧ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))) ∧ (𝑦 ∈ ℝ ∧ 𝑦 < 𝐷)) → (𝐷 ∈ ℤ ∧ (𝐷𝑀𝐷𝑁)))
158 breq1 4688 . . . . . . . . . 10 (𝑛 = 𝐷 → (𝑛𝑀𝐷𝑀))
159 breq1 4688 . . . . . . . . . 10 (𝑛 = 𝐷 → (𝑛𝑁𝐷𝑁))
160158, 159anbi12d 747 . . . . . . . . 9 (𝑛 = 𝐷 → ((𝑛𝑀𝑛𝑁) ↔ (𝐷𝑀𝐷𝑁)))
161160elrab 3396 . . . . . . . 8 (𝐷 ∈ {𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)} ↔ (𝐷 ∈ ℤ ∧ (𝐷𝑀𝐷𝑁)))
162157, 161sylibr 224 . . . . . . 7 (((¬ (𝑀 = 0 ∧ 𝑁 = 0) ∧ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))) ∧ (𝑦 ∈ ℝ ∧ 𝑦 < 𝐷)) → 𝐷 ∈ {𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)})
163 breq2 4689 . . . . . . . 8 (𝑧 = 𝐷 → (𝑦 < 𝑧𝑦 < 𝐷))
164163adantl 481 . . . . . . 7 ((((¬ (𝑀 = 0 ∧ 𝑁 = 0) ∧ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))) ∧ (𝑦 ∈ ℝ ∧ 𝑦 < 𝐷)) ∧ 𝑧 = 𝐷) → (𝑦 < 𝑧𝑦 < 𝐷))
165 simprr 811 . . . . . . 7 (((¬ (𝑀 = 0 ∧ 𝑁 = 0) ∧ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))) ∧ (𝑦 ∈ ℝ ∧ 𝑦 < 𝐷)) → 𝑦 < 𝐷)
166162, 164, 165rspcedvd 3348 . . . . . 6 (((¬ (𝑀 = 0 ∧ 𝑁 = 0) ∧ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))) ∧ (𝑦 ∈ ℝ ∧ 𝑦 < 𝐷)) → ∃𝑧 ∈ {𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)}𝑦 < 𝑧)
16766, 72, 152, 166eqsupd 8404 . . . . 5 ((¬ (𝑀 = 0 ∧ 𝑁 = 0) ∧ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))) → sup({𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)}, ℝ, < ) = 𝐷)
16864, 167eqtrd 2685 . . . 4 ((¬ (𝑀 = 0 ∧ 𝑁 = 0) ∧ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))) → if((𝑀 = 0 ∧ 𝑁 = 0), 0, sup({𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)}, ℝ, < )) = 𝐷)
16962, 168pm2.61ian 848 . . 3 (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷))) → if((𝑀 = 0 ∧ 𝑁 = 0), 0, sup({𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)}, ℝ, < )) = 𝐷)
17023, 169eqtr2d 2686 . 2 (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷))) → 𝐷 = (𝑀 gcd 𝑁))
17121, 170impbida 895 1 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝐷 = (𝑀 gcd 𝑁) ↔ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷))))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wb 196  wo 382  wa 383  w3a 1054   = wceq 1523  wcel 2030  wral 2941  {crab 2945  ifcif 4119   class class class wbr 4685   Or wor 5063  (class class class)co 6690  supcsup 8387  cr 9973  0cc0 9974   < clt 10112  cle 10113  cn 11058  0cn0 11330  cz 11415  cdvds 15027   gcd cgcd 15263
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-8 2032  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631  ax-sep 4814  ax-nul 4822  ax-pow 4873  ax-pr 4936  ax-un 6991  ax-cnex 10030  ax-resscn 10031  ax-1cn 10032  ax-icn 10033  ax-addcl 10034  ax-addrcl 10035  ax-mulcl 10036  ax-mulrcl 10037  ax-mulcom 10038  ax-addass 10039  ax-mulass 10040  ax-distr 10041  ax-i2m1 10042  ax-1ne0 10043  ax-1rid 10044  ax-rnegex 10045  ax-rrecex 10046  ax-cnre 10047  ax-pre-lttri 10048  ax-pre-lttrn 10049  ax-pre-ltadd 10050  ax-pre-mulgt0 10051  ax-pre-sup 10052
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3or 1055  df-3an 1056  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-eu 2502  df-mo 2503  df-clab 2638  df-cleq 2644  df-clel 2647  df-nfc 2782  df-ne 2824  df-nel 2927  df-ral 2946  df-rex 2947  df-reu 2948  df-rmo 2949  df-rab 2950  df-v 3233  df-sbc 3469  df-csb 3567  df-dif 3610  df-un 3612  df-in 3614  df-ss 3621  df-pss 3623  df-nul 3949  df-if 4120  df-pw 4193  df-sn 4211  df-pr 4213  df-tp 4215  df-op 4217  df-uni 4469  df-iun 4554  df-br 4686  df-opab 4746  df-mpt 4763  df-tr 4786  df-id 5053  df-eprel 5058  df-po 5064  df-so 5065  df-fr 5102  df-we 5104  df-xp 5149  df-rel 5150  df-cnv 5151  df-co 5152  df-dm 5153  df-rn 5154  df-res 5155  df-ima 5156  df-pred 5718  df-ord 5764  df-on 5765  df-lim 5766  df-suc 5767  df-iota 5889  df-fun 5928  df-fn 5929  df-f 5930  df-f1 5931  df-fo 5932  df-f1o 5933  df-fv 5934  df-riota 6651  df-ov 6693  df-oprab 6694  df-mpt2 6695  df-om 7108  df-2nd 7211  df-wrecs 7452  df-recs 7513  df-rdg 7551  df-er 7787  df-en 7998  df-dom 7999  df-sdom 8000  df-sup 8389  df-inf 8390  df-pnf 10114  df-mnf 10115  df-xr 10116  df-ltxr 10117  df-le 10118  df-sub 10306  df-neg 10307  df-div 10723  df-nn 11059  df-2 11117  df-3 11118  df-n0 11331  df-z 11416  df-uz 11726  df-rp 11871  df-fl 12633  df-mod 12709  df-seq 12842  df-exp 12901  df-cj 13883  df-re 13884  df-im 13885  df-sqrt 14019  df-abs 14020  df-dvds 15028  df-gcd 15264
This theorem is referenced by:  dfgcd3  33300
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