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Theorem dfgcd2 15887
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 15848 . . . . . 6 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 gcd 𝑁) ∈ ℕ0)
21nn0ge0d 11950 . . . . 5 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → 0 ≤ (𝑀 gcd 𝑁))
3 gcddvds 15845 . . . . 5 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((𝑀 gcd 𝑁) ∥ 𝑀 ∧ (𝑀 gcd 𝑁) ∥ 𝑁))
4 3anass 1092 . . . . . . . 8 ((𝑒 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ↔ (𝑒 ∈ ℤ ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)))
54biancomi 466 . . . . . . 7 ((𝑒 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ↔ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑒 ∈ ℤ))
6 dvdsgcd 15885 . . . . . . 7 ((𝑒 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((𝑒𝑀𝑒𝑁) → 𝑒 ∥ (𝑀 gcd 𝑁)))
75, 6sylbir 238 . . . . . 6 (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝑒 ∈ ℤ) → ((𝑒𝑀𝑒𝑁) → 𝑒 ∥ (𝑀 gcd 𝑁)))
87ralrimiva 3152 . . . . 5 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒 ∥ (𝑀 gcd 𝑁)))
92, 3, 83jca 1125 . . . 4 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (0 ≤ (𝑀 gcd 𝑁) ∧ ((𝑀 gcd 𝑁) ∥ 𝑀 ∧ (𝑀 gcd 𝑁) ∥ 𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒 ∥ (𝑀 gcd 𝑁))))
109adantr 484 . . 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))))
11 breq2 5037 . . . . 5 (𝐷 = (𝑀 gcd 𝑁) → (0 ≤ 𝐷 ↔ 0 ≤ (𝑀 gcd 𝑁)))
12 breq1 5036 . . . . . 6 (𝐷 = (𝑀 gcd 𝑁) → (𝐷𝑀 ↔ (𝑀 gcd 𝑁) ∥ 𝑀))
13 breq1 5036 . . . . . 6 (𝐷 = (𝑀 gcd 𝑁) → (𝐷𝑁 ↔ (𝑀 gcd 𝑁) ∥ 𝑁))
1412, 13anbi12d 633 . . . . 5 (𝐷 = (𝑀 gcd 𝑁) → ((𝐷𝑀𝐷𝑁) ↔ ((𝑀 gcd 𝑁) ∥ 𝑀 ∧ (𝑀 gcd 𝑁) ∥ 𝑁)))
15 breq2 5037 . . . . . . 7 (𝐷 = (𝑀 gcd 𝑁) → (𝑒𝐷𝑒 ∥ (𝑀 gcd 𝑁)))
1615imbi2d 344 . . . . . 6 (𝐷 = (𝑀 gcd 𝑁) → (((𝑒𝑀𝑒𝑁) → 𝑒𝐷) ↔ ((𝑒𝑀𝑒𝑁) → 𝑒 ∥ (𝑀 gcd 𝑁))))
1716ralbidv 3165 . . . . 5 (𝐷 = (𝑀 gcd 𝑁) → (∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷) ↔ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒 ∥ (𝑀 gcd 𝑁))))
1811, 14, 173anbi123d 1433 . . . 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)))))
1918adantl 485 . . 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)))))
2010, 19mpbird 260 . 2 (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ 𝐷 = (𝑀 gcd 𝑁)) → (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))
21 gcdval 15838 . . . 4 ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 gcd 𝑁) = if((𝑀 = 0 ∧ 𝑁 = 0), 0, sup({𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)}, ℝ, < )))
2221adantr 484 . . 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, < )))
23 iftrue 4434 . . . . . 6 ((𝑀 = 0 ∧ 𝑁 = 0) → if((𝑀 = 0 ∧ 𝑁 = 0), 0, sup({𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)}, ℝ, < )) = 0)
2423adantr 484 . . . . 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)
25 breq2 5037 . . . . . . . . . 10 (𝑀 = 0 → (𝐷𝑀𝐷 ∥ 0))
26 breq2 5037 . . . . . . . . . 10 (𝑁 = 0 → (𝐷𝑁𝐷 ∥ 0))
2725, 26bi2anan9 638 . . . . . . . . 9 ((𝑀 = 0 ∧ 𝑁 = 0) → ((𝐷𝑀𝐷𝑁) ↔ (𝐷 ∥ 0 ∧ 𝐷 ∥ 0)))
28 breq2 5037 . . . . . . . . . . . 12 (𝑀 = 0 → (𝑒𝑀𝑒 ∥ 0))
29 breq2 5037 . . . . . . . . . . . 12 (𝑁 = 0 → (𝑒𝑁𝑒 ∥ 0))
3028, 29bi2anan9 638 . . . . . . . . . . 11 ((𝑀 = 0 ∧ 𝑁 = 0) → ((𝑒𝑀𝑒𝑁) ↔ (𝑒 ∥ 0 ∧ 𝑒 ∥ 0)))
3130imbi1d 345 . . . . . . . . . 10 ((𝑀 = 0 ∧ 𝑁 = 0) → (((𝑒𝑀𝑒𝑁) → 𝑒𝐷) ↔ ((𝑒 ∥ 0 ∧ 𝑒 ∥ 0) → 𝑒𝐷)))
3231ralbidv 3165 . . . . . . . . 9 ((𝑀 = 0 ∧ 𝑁 = 0) → (∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷) ↔ ∀𝑒 ∈ ℤ ((𝑒 ∥ 0 ∧ 𝑒 ∥ 0) → 𝑒𝐷)))
3327, 323anbi23d 1436 . . . . . . . 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))))
34 dvdszrcl 15607 . . . . . . . . . . 11 (𝐷 ∥ 0 → (𝐷 ∈ ℤ ∧ 0 ∈ ℤ))
35 dvds0 15620 . . . . . . . . . . . . . . . . . 18 (𝑒 ∈ ℤ → 𝑒 ∥ 0)
3635, 35jca 515 . . . . . . . . . . . . . . . . 17 (𝑒 ∈ ℤ → (𝑒 ∥ 0 ∧ 𝑒 ∥ 0))
3736adantl 485 . . . . . . . . . . . . . . . 16 (((𝐷 ∈ ℤ ∧ 0 ≤ 𝐷) ∧ 𝑒 ∈ ℤ) → (𝑒 ∥ 0 ∧ 𝑒 ∥ 0))
38 pm5.5 365 . . . . . . . . . . . . . . . 16 ((𝑒 ∥ 0 ∧ 𝑒 ∥ 0) → (((𝑒 ∥ 0 ∧ 𝑒 ∥ 0) → 𝑒𝐷) ↔ 𝑒𝐷))
3937, 38syl 17 . . . . . . . . . . . . . . 15 (((𝐷 ∈ ℤ ∧ 0 ≤ 𝐷) ∧ 𝑒 ∈ ℤ) → (((𝑒 ∥ 0 ∧ 𝑒 ∥ 0) → 𝑒𝐷) ↔ 𝑒𝐷))
4039ralbidva 3164 . . . . . . . . . . . . . 14 ((𝐷 ∈ ℤ ∧ 0 ≤ 𝐷) → (∀𝑒 ∈ ℤ ((𝑒 ∥ 0 ∧ 𝑒 ∥ 0) → 𝑒𝐷) ↔ ∀𝑒 ∈ ℤ 𝑒𝐷))
41 0z 11984 . . . . . . . . . . . . . . . . 17 0 ∈ ℤ
42 breq1 5036 . . . . . . . . . . . . . . . . . 18 (𝑒 = 0 → (𝑒𝐷 ↔ 0 ∥ 𝐷))
4342rspcv 3569 . . . . . . . . . . . . . . . . 17 (0 ∈ ℤ → (∀𝑒 ∈ ℤ 𝑒𝐷 → 0 ∥ 𝐷))
4441, 43ax-mp 5 . . . . . . . . . . . . . . . 16 (∀𝑒 ∈ ℤ 𝑒𝐷 → 0 ∥ 𝐷)
45 0dvds 15625 . . . . . . . . . . . . . . . . . 18 (𝐷 ∈ ℤ → (0 ∥ 𝐷𝐷 = 0))
4645biimpd 232 . . . . . . . . . . . . . . . . 17 (𝐷 ∈ ℤ → (0 ∥ 𝐷𝐷 = 0))
47 eqcom 2808 . . . . . . . . . . . . . . . . 17 (0 = 𝐷𝐷 = 0)
4846, 47syl6ibr 255 . . . . . . . . . . . . . . . 16 (𝐷 ∈ ℤ → (0 ∥ 𝐷 → 0 = 𝐷))
4944, 48syl5 34 . . . . . . . . . . . . . . 15 (𝐷 ∈ ℤ → (∀𝑒 ∈ ℤ 𝑒𝐷 → 0 = 𝐷))
5049adantr 484 . . . . . . . . . . . . . 14 ((𝐷 ∈ ℤ ∧ 0 ≤ 𝐷) → (∀𝑒 ∈ ℤ 𝑒𝐷 → 0 = 𝐷))
5140, 50sylbid 243 . . . . . . . . . . . . 13 ((𝐷 ∈ ℤ ∧ 0 ≤ 𝐷) → (∀𝑒 ∈ ℤ ((𝑒 ∥ 0 ∧ 𝑒 ∥ 0) → 𝑒𝐷) → 0 = 𝐷))
5251ex 416 . . . . . . . . . . . 12 (𝐷 ∈ ℤ → (0 ≤ 𝐷 → (∀𝑒 ∈ ℤ ((𝑒 ∥ 0 ∧ 𝑒 ∥ 0) → 𝑒𝐷) → 0 = 𝐷)))
5352adantr 484 . . . . . . . . . . 11 ((𝐷 ∈ ℤ ∧ 0 ∈ ℤ) → (0 ≤ 𝐷 → (∀𝑒 ∈ ℤ ((𝑒 ∥ 0 ∧ 𝑒 ∥ 0) → 𝑒𝐷) → 0 = 𝐷)))
5434, 53syl 17 . . . . . . . . . 10 (𝐷 ∥ 0 → (0 ≤ 𝐷 → (∀𝑒 ∈ ℤ ((𝑒 ∥ 0 ∧ 𝑒 ∥ 0) → 𝑒𝐷) → 0 = 𝐷)))
5554adantr 484 . . . . . . . . 9 ((𝐷 ∥ 0 ∧ 𝐷 ∥ 0) → (0 ≤ 𝐷 → (∀𝑒 ∈ ℤ ((𝑒 ∥ 0 ∧ 𝑒 ∥ 0) → 𝑒𝐷) → 0 = 𝐷)))
56553imp21 1111 . . . . . . . 8 ((0 ≤ 𝐷 ∧ (𝐷 ∥ 0 ∧ 𝐷 ∥ 0) ∧ ∀𝑒 ∈ ℤ ((𝑒 ∥ 0 ∧ 𝑒 ∥ 0) → 𝑒𝐷)) → 0 = 𝐷)
5733, 56syl6bi 256 . . . . . . 7 ((𝑀 = 0 ∧ 𝑁 = 0) → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)) → 0 = 𝐷))
5857adantld 494 . . . . . 6 ((𝑀 = 0 ∧ 𝑁 = 0) → (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷))) → 0 = 𝐷))
5958imp 410 . . . . 5 (((𝑀 = 0 ∧ 𝑁 = 0) ∧ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))) → 0 = 𝐷)
6024, 59eqtrd 2836 . . . 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)
61 iffalse 4437 . . . . . 6 (¬ (𝑀 = 0 ∧ 𝑁 = 0) → if((𝑀 = 0 ∧ 𝑁 = 0), 0, sup({𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)}, ℝ, < )) = sup({𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)}, ℝ, < ))
6261adantr 484 . . . . 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, < ))
63 ltso 10714 . . . . . . 7 < Or ℝ
6463a1i 11 . . . . . 6 ((¬ (𝑀 = 0 ∧ 𝑁 = 0) ∧ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))) → < Or ℝ)
65 dvdszrcl 15607 . . . . . . . . . . 11 (𝐷𝑀 → (𝐷 ∈ ℤ ∧ 𝑀 ∈ ℤ))
6665simpld 498 . . . . . . . . . 10 (𝐷𝑀𝐷 ∈ ℤ)
6766zred 12079 . . . . . . . . 9 (𝐷𝑀𝐷 ∈ ℝ)
6867adantr 484 . . . . . . . 8 ((𝐷𝑀𝐷𝑁) → 𝐷 ∈ ℝ)
69683ad2ant2 1131 . . . . . . 7 ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)) → 𝐷 ∈ ℝ)
7069ad2antll 728 . . . . . 6 ((¬ (𝑀 = 0 ∧ 𝑁 = 0) ∧ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))) → 𝐷 ∈ ℝ)
71 breq1 5036 . . . . . . . . . 10 (𝑛 = 𝑦 → (𝑛𝑀𝑦𝑀))
72 breq1 5036 . . . . . . . . . 10 (𝑛 = 𝑦 → (𝑛𝑁𝑦𝑁))
7371, 72anbi12d 633 . . . . . . . . 9 (𝑛 = 𝑦 → ((𝑛𝑀𝑛𝑁) ↔ (𝑦𝑀𝑦𝑁)))
7473elrab 3631 . . . . . . . 8 (𝑦 ∈ {𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)} ↔ (𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)))
75 breq1 5036 . . . . . . . . . . . . . . . . . . . 20 (𝑒 = 𝑦 → (𝑒𝑀𝑦𝑀))
76 breq1 5036 . . . . . . . . . . . . . . . . . . . 20 (𝑒 = 𝑦 → (𝑒𝑁𝑦𝑁))
7775, 76anbi12d 633 . . . . . . . . . . . . . . . . . . 19 (𝑒 = 𝑦 → ((𝑒𝑀𝑒𝑁) ↔ (𝑦𝑀𝑦𝑁)))
78 breq1 5036 . . . . . . . . . . . . . . . . . . 19 (𝑒 = 𝑦 → (𝑒𝐷𝑦𝐷))
7977, 78imbi12d 348 . . . . . . . . . . . . . . . . . 18 (𝑒 = 𝑦 → (((𝑒𝑀𝑒𝑁) → 𝑒𝐷) ↔ ((𝑦𝑀𝑦𝑁) → 𝑦𝐷)))
8079rspcv 3569 . . . . . . . . . . . . . . . . 17 (𝑦 ∈ ℤ → (∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷) → ((𝑦𝑀𝑦𝑁) → 𝑦𝐷)))
8180com23 86 . . . . . . . . . . . . . . . 16 (𝑦 ∈ ℤ → ((𝑦𝑀𝑦𝑁) → (∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷) → 𝑦𝐷)))
8281imp 410 . . . . . . . . . . . . . . 15 ((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) → (∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷) → 𝑦𝐷))
8382ad2antrr 725 . . . . . . . . . . . . . 14 ((((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷) → 𝑦𝐷))
84 elnn0z 11986 . . . . . . . . . . . . . . . . . . . . . 22 (𝐷 ∈ ℕ0 ↔ (𝐷 ∈ ℤ ∧ 0 ≤ 𝐷))
8584simplbi2 504 . . . . . . . . . . . . . . . . . . . . 21 (𝐷 ∈ ℤ → (0 ≤ 𝐷𝐷 ∈ ℕ0))
8685adantr 484 . . . . . . . . . . . . . . . . . . . 20 ((𝐷 ∈ ℤ ∧ 𝑀 ∈ ℤ) → (0 ≤ 𝐷𝐷 ∈ ℕ0))
8765, 86syl 17 . . . . . . . . . . . . . . . . . . 19 (𝐷𝑀 → (0 ≤ 𝐷𝐷 ∈ ℕ0))
8887adantr 484 . . . . . . . . . . . . . . . . . 18 ((𝐷𝑀𝐷𝑁) → (0 ≤ 𝐷𝐷 ∈ ℕ0))
8988impcom 411 . . . . . . . . . . . . . . . . 17 ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → 𝐷 ∈ ℕ0)
90 simp-4l 782 . . . . . . . . . . . . . . . . . . . . . . . . 25 (((((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) ∧ 𝐷 ∈ ℕ0) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁))) → 𝑦 ∈ ℤ)
91 elnn0 11891 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 (𝐷 ∈ ℕ0 ↔ (𝐷 ∈ ℕ ∨ 𝐷 = 0))
92 2a1 28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 (𝐷 ∈ ℕ → (((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → 𝐷 ∈ ℕ)))
93 breq1 5036 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 (𝐷 = 0 → (𝐷𝑀 ↔ 0 ∥ 𝑀))
94 breq1 5036 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 (𝐷 = 0 → (𝐷𝑁 ↔ 0 ∥ 𝑁))
9593, 94anbi12d 633 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 (𝐷 = 0 → ((𝐷𝑀𝐷𝑁) ↔ (0 ∥ 𝑀 ∧ 0 ∥ 𝑁)))
9695anbi2d 631 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 (𝐷 = 0 → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) ↔ (0 ≤ 𝐷 ∧ (0 ∥ 𝑀 ∧ 0 ∥ 𝑁))))
9796adantr 484 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 ((𝐷 = 0 ∧ ((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0))) → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) ↔ (0 ≤ 𝐷 ∧ (0 ∥ 𝑀 ∧ 0 ∥ 𝑁))))
98 ianor 979 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 (¬ (𝑀 = 0 ∧ 𝑁 = 0) ↔ (¬ 𝑀 = 0 ∨ ¬ 𝑁 = 0))
99 dvdszrcl 15607 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 (0 ∥ 𝑀 → (0 ∈ ℤ ∧ 𝑀 ∈ ℤ))
100 0dvds 15625 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 (𝑀 ∈ ℤ → (0 ∥ 𝑀𝑀 = 0))
101 pm2.24 124 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 (𝑀 = 0 → (¬ 𝑀 = 0 → 𝐷 ∈ ℕ))
102100, 101syl6bi 256 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 (𝑀 ∈ ℤ → (0 ∥ 𝑀 → (¬ 𝑀 = 0 → 𝐷 ∈ ℕ)))
103102adantl 485 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 ((0 ∈ ℤ ∧ 𝑀 ∈ ℤ) → (0 ∥ 𝑀 → (¬ 𝑀 = 0 → 𝐷 ∈ ℕ)))
10499, 103mpcom 38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 (0 ∥ 𝑀 → (¬ 𝑀 = 0 → 𝐷 ∈ ℕ))
105104adantr 484 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 ((0 ∥ 𝑀 ∧ 0 ∥ 𝑁) → (¬ 𝑀 = 0 → 𝐷 ∈ ℕ))
106105com12 32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 𝑀 = 0 → ((0 ∥ 𝑀 ∧ 0 ∥ 𝑁) → 𝐷 ∈ ℕ))
107 dvdszrcl 15607 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 (0 ∥ 𝑁 → (0 ∈ ℤ ∧ 𝑁 ∈ ℤ))
108 0dvds 15625 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 (𝑁 ∈ ℤ → (0 ∥ 𝑁𝑁 = 0))
109 pm2.24 124 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 (𝑁 = 0 → (¬ 𝑁 = 0 → 𝐷 ∈ ℕ))
110108, 109syl6bi 256 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 (𝑁 ∈ ℤ → (0 ∥ 𝑁 → (¬ 𝑁 = 0 → 𝐷 ∈ ℕ)))
111110adantl 485 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 ((0 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (0 ∥ 𝑁 → (¬ 𝑁 = 0 → 𝐷 ∈ ℕ)))
112107, 111mpcom 38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 (0 ∥ 𝑁 → (¬ 𝑁 = 0 → 𝐷 ∈ ℕ))
113112adantl 485 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 ((0 ∥ 𝑀 ∧ 0 ∥ 𝑁) → (¬ 𝑁 = 0 → 𝐷 ∈ ℕ))
114113com12 32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 𝑁 = 0 → ((0 ∥ 𝑀 ∧ 0 ∥ 𝑁) → 𝐷 ∈ ℕ))
115106, 114jaoi 854 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 ((¬ 𝑀 = 0 ∨ ¬ 𝑁 = 0) → ((0 ∥ 𝑀 ∧ 0 ∥ 𝑁) → 𝐷 ∈ ℕ))
11698, 115sylbi 220 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 (¬ (𝑀 = 0 ∧ 𝑁 = 0) → ((0 ∥ 𝑀 ∧ 0 ∥ 𝑁) → 𝐷 ∈ ℕ))
117116adantld 494 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 (¬ (𝑀 = 0 ∧ 𝑁 = 0) → ((0 ≤ 𝐷 ∧ (0 ∥ 𝑀 ∧ 0 ∥ 𝑁)) → 𝐷 ∈ ℕ))
118117ad2antll 728 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 ((𝐷 = 0 ∧ ((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0))) → ((0 ≤ 𝐷 ∧ (0 ∥ 𝑀 ∧ 0 ∥ 𝑁)) → 𝐷 ∈ ℕ))
11997, 118sylbid 243 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 ((𝐷 = 0 ∧ ((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0))) → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → 𝐷 ∈ ℕ))
120119ex 416 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 (𝐷 = 0 → (((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → 𝐷 ∈ ℕ)))
12192, 120jaoi 854 . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ((𝐷 ∈ ℕ ∨ 𝐷 = 0) → (((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → 𝐷 ∈ ℕ)))
12291, 121sylbi 220 . . . . . . . . . . . . . . . . . . . . . . . . . . 27 (𝐷 ∈ ℕ0 → (((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → 𝐷 ∈ ℕ)))
123122impcom 411 . . . . . . . . . . . . . . . . . . . . . . . . . 26 ((((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) ∧ 𝐷 ∈ ℕ0) → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → 𝐷 ∈ ℕ))
124123imp 410 . . . . . . . . . . . . . . . . . . . . . . . . 25 (((((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) ∧ 𝐷 ∈ ℕ0) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁))) → 𝐷 ∈ ℕ)
125 dvdsle 15655 . . . . . . . . . . . . . . . . . . . . . . . . 25 ((𝑦 ∈ ℤ ∧ 𝐷 ∈ ℕ) → (𝑦𝐷𝑦𝐷))
12690, 124, 125syl2anc 587 . . . . . . . . . . . . . . . . . . . . . . . 24 (((((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) ∧ 𝐷 ∈ ℕ0) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁))) → (𝑦𝐷𝑦𝐷))
127126exp31 423 . . . . . . . . . . . . . . . . . . . . . . 23 (((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) → (𝐷 ∈ ℕ0 → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → (𝑦𝐷𝑦𝐷))))
128127com14 96 . . . . . . . . . . . . . . . . . . . . . 22 (𝑦𝐷 → (𝐷 ∈ ℕ0 → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → (((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) → 𝑦𝐷))))
129128imp 410 . . . . . . . . . . . . . . . . . . . . 21 ((𝑦𝐷𝐷 ∈ ℕ0) → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → (((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) → 𝑦𝐷)))
130129impcom 411 . . . . . . . . . . . . . . . . . . . 20 (((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) ∧ (𝑦𝐷𝐷 ∈ ℕ0)) → (((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) → 𝑦𝐷))
131130imp 410 . . . . . . . . . . . . . . . . . . 19 ((((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) ∧ (𝑦𝐷𝐷 ∈ ℕ0)) ∧ ((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0))) → 𝑦𝐷)
132 zre 11977 . . . . . . . . . . . . . . . . . . . . 21 (𝑦 ∈ ℤ → 𝑦 ∈ ℝ)
133132ad2antrr 725 . . . . . . . . . . . . . . . . . . . 20 (((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) → 𝑦 ∈ ℝ)
13468ad2antlr 726 . . . . . . . . . . . . . . . . . . . 20 (((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) ∧ (𝑦𝐷𝐷 ∈ ℕ0)) → 𝐷 ∈ ℝ)
135 lenlt 10712 . . . . . . . . . . . . . . . . . . . 20 ((𝑦 ∈ ℝ ∧ 𝐷 ∈ ℝ) → (𝑦𝐷 ↔ ¬ 𝐷 < 𝑦))
136133, 134, 135syl2anr 599 . . . . . . . . . . . . . . . . . . 19 ((((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) ∧ (𝑦𝐷𝐷 ∈ ℕ0)) ∧ ((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0))) → (𝑦𝐷 ↔ ¬ 𝐷 < 𝑦))
137131, 136mpbid 235 . . . . . . . . . . . . . . . . . 18 ((((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) ∧ (𝑦𝐷𝐷 ∈ ℕ0)) ∧ ((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0))) → ¬ 𝐷 < 𝑦)
138137exp31 423 . . . . . . . . . . . . . . . . 17 ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → ((𝑦𝐷𝐷 ∈ ℕ0) → (((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) → ¬ 𝐷 < 𝑦)))
13989, 138mpan2d 693 . . . . . . . . . . . . . . . 16 ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → (𝑦𝐷 → (((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) → ¬ 𝐷 < 𝑦)))
140139com13 88 . . . . . . . . . . . . . . 15 (((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) → (𝑦𝐷 → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → ¬ 𝐷 < 𝑦)))
141140adantr 484 . . . . . . . . . . . . . 14 ((((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (𝑦𝐷 → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → ¬ 𝐷 < 𝑦)))
14283, 141syld 47 . . . . . . . . . . . . 13 ((((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → (∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷) → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → ¬ 𝐷 < 𝑦)))
143142com13 88 . . . . . . . . . . . 12 ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁)) → (∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷) → ((((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → ¬ 𝐷 < 𝑦)))
1441433impia 1114 . . . . . . . . . . 11 ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)) → ((((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → ¬ 𝐷 < 𝑦))
145144com12 32 . . . . . . . . . 10 ((((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ)) → ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)) → ¬ 𝐷 < 𝑦))
146145expimpd 457 . . . . . . . . 9 (((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) ∧ ¬ (𝑀 = 0 ∧ 𝑁 = 0)) → (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷))) → ¬ 𝐷 < 𝑦))
147146expimpd 457 . . . . . . . 8 ((𝑦 ∈ ℤ ∧ (𝑦𝑀𝑦𝑁)) → ((¬ (𝑀 = 0 ∧ 𝑁 = 0) ∧ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))) → ¬ 𝐷 < 𝑦))
14874, 147sylbi 220 . . . . . . 7 (𝑦 ∈ {𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)} → ((¬ (𝑀 = 0 ∧ 𝑁 = 0) ∧ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))) → ¬ 𝐷 < 𝑦))
149148impcom 411 . . . . . 6 (((¬ (𝑀 = 0 ∧ 𝑁 = 0) ∧ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))) ∧ 𝑦 ∈ {𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)}) → ¬ 𝐷 < 𝑦)
15066adantr 484 . . . . . . . . . . . 12 ((𝐷𝑀𝐷𝑁) → 𝐷 ∈ ℤ)
151150ancri 553 . . . . . . . . . . 11 ((𝐷𝑀𝐷𝑁) → (𝐷 ∈ ℤ ∧ (𝐷𝑀𝐷𝑁)))
1521513ad2ant2 1131 . . . . . . . . . 10 ((0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)) → (𝐷 ∈ ℤ ∧ (𝐷𝑀𝐷𝑁)))
153152ad2antll 728 . . . . . . . . 9 ((¬ (𝑀 = 0 ∧ 𝑁 = 0) ∧ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))) → (𝐷 ∈ ℤ ∧ (𝐷𝑀𝐷𝑁)))
154153adantr 484 . . . . . . . 8 (((¬ (𝑀 = 0 ∧ 𝑁 = 0) ∧ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))) ∧ (𝑦 ∈ ℝ ∧ 𝑦 < 𝐷)) → (𝐷 ∈ ℤ ∧ (𝐷𝑀𝐷𝑁)))
155 breq1 5036 . . . . . . . . . 10 (𝑛 = 𝐷 → (𝑛𝑀𝐷𝑀))
156 breq1 5036 . . . . . . . . . 10 (𝑛 = 𝐷 → (𝑛𝑁𝐷𝑁))
157155, 156anbi12d 633 . . . . . . . . 9 (𝑛 = 𝐷 → ((𝑛𝑀𝑛𝑁) ↔ (𝐷𝑀𝐷𝑁)))
158157elrab 3631 . . . . . . . 8 (𝐷 ∈ {𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)} ↔ (𝐷 ∈ ℤ ∧ (𝐷𝑀𝐷𝑁)))
159154, 158sylibr 237 . . . . . . 7 (((¬ (𝑀 = 0 ∧ 𝑁 = 0) ∧ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))) ∧ (𝑦 ∈ ℝ ∧ 𝑦 < 𝐷)) → 𝐷 ∈ {𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)})
160 breq2 5037 . . . . . . . 8 (𝑧 = 𝐷 → (𝑦 < 𝑧𝑦 < 𝐷))
161160adantl 485 . . . . . . 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))
162 simprr 772 . . . . . . 7 (((¬ (𝑀 = 0 ∧ 𝑁 = 0) ∧ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))) ∧ (𝑦 ∈ ℝ ∧ 𝑦 < 𝐷)) → 𝑦 < 𝐷)
163159, 161, 162rspcedvd 3577 . . . . . 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)
16464, 70, 149, 163eqsupd 8909 . . . . 5 ((¬ (𝑀 = 0 ∧ 𝑁 = 0) ∧ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷)))) → sup({𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)}, ℝ, < ) = 𝐷)
16562, 164eqtrd 2836 . . . 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)
16660, 165pm2.61ian 811 . . 3 (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷))) → if((𝑀 = 0 ∧ 𝑁 = 0), 0, sup({𝑛 ∈ ℤ ∣ (𝑛𝑀𝑛𝑁)}, ℝ, < )) = 𝐷)
16722, 166eqtr2d 2837 . 2 (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (0 ≤ 𝐷 ∧ (𝐷𝑀𝐷𝑁) ∧ ∀𝑒 ∈ ℤ ((𝑒𝑀𝑒𝑁) → 𝑒𝐷))) → 𝐷 = (𝑀 gcd 𝑁))
16820, 167impbida 800 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 209  wa 399  wo 844  w3a 1084   = wceq 1538  wcel 2112  wral 3109  {crab 3113  ifcif 4428   class class class wbr 5033   Or wor 5441  (class class class)co 7139  supcsup 8892  cr 10529  0cc0 10530   < clt 10668  cle 10669  cn 11629  0cn0 11889  cz 11973  cdvds 15602   gcd cgcd 15836
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2114  ax-9 2122  ax-10 2143  ax-11 2159  ax-12 2176  ax-ext 2773  ax-sep 5170  ax-nul 5177  ax-pow 5234  ax-pr 5298  ax-un 7445  ax-cnex 10586  ax-resscn 10587  ax-1cn 10588  ax-icn 10589  ax-addcl 10590  ax-addrcl 10591  ax-mulcl 10592  ax-mulrcl 10593  ax-mulcom 10594  ax-addass 10595  ax-mulass 10596  ax-distr 10597  ax-i2m1 10598  ax-1ne0 10599  ax-1rid 10600  ax-rnegex 10601  ax-rrecex 10602  ax-cnre 10603  ax-pre-lttri 10604  ax-pre-lttrn 10605  ax-pre-ltadd 10606  ax-pre-mulgt0 10607  ax-pre-sup 10608
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3or 1085  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2601  df-eu 2632  df-clab 2780  df-cleq 2794  df-clel 2873  df-nfc 2941  df-ne 2991  df-nel 3095  df-ral 3114  df-rex 3115  df-reu 3116  df-rmo 3117  df-rab 3118  df-v 3446  df-sbc 3724  df-csb 3832  df-dif 3887  df-un 3889  df-in 3891  df-ss 3901  df-pss 3903  df-nul 4247  df-if 4429  df-pw 4502  df-sn 4529  df-pr 4531  df-tp 4533  df-op 4535  df-uni 4804  df-iun 4886  df-br 5034  df-opab 5096  df-mpt 5114  df-tr 5140  df-id 5428  df-eprel 5433  df-po 5442  df-so 5443  df-fr 5482  df-we 5484  df-xp 5529  df-rel 5530  df-cnv 5531  df-co 5532  df-dm 5533  df-rn 5534  df-res 5535  df-ima 5536  df-pred 6120  df-ord 6166  df-on 6167  df-lim 6168  df-suc 6169  df-iota 6287  df-fun 6330  df-fn 6331  df-f 6332  df-f1 6333  df-fo 6334  df-f1o 6335  df-fv 6336  df-riota 7097  df-ov 7142  df-oprab 7143  df-mpo 7144  df-om 7565  df-2nd 7676  df-wrecs 7934  df-recs 7995  df-rdg 8033  df-er 8276  df-en 8497  df-dom 8498  df-sdom 8499  df-sup 8894  df-inf 8895  df-pnf 10670  df-mnf 10671  df-xr 10672  df-ltxr 10673  df-le 10674  df-sub 10865  df-neg 10866  df-div 11291  df-nn 11630  df-2 11692  df-3 11693  df-n0 11890  df-z 11974  df-uz 12236  df-rp 12382  df-fl 13161  df-mod 13237  df-seq 13369  df-exp 13430  df-cj 14453  df-re 14454  df-im 14455  df-sqrt 14589  df-abs 14590  df-dvds 15603  df-gcd 15837
This theorem is referenced by:  dfgcd3  34733
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