Proof of Theorem 3lcm2e6woprm
| Step | Hyp | Ref
| Expression |
| 1 | | 3cn 12347 |
. . . 4
⊢ 3 ∈
ℂ |
| 2 | | 2cn 12341 |
. . . 4
⊢ 2 ∈
ℂ |
| 3 | 1, 2 | mulcli 11268 |
. . 3
⊢ (3
· 2) ∈ ℂ |
| 4 | | 3z 12650 |
. . . 4
⊢ 3 ∈
ℤ |
| 5 | | 2z 12649 |
. . . 4
⊢ 2 ∈
ℤ |
| 6 | | lcmcl 16638 |
. . . . 5
⊢ ((3
∈ ℤ ∧ 2 ∈ ℤ) → (3 lcm 2) ∈
ℕ0) |
| 7 | 6 | nn0cnd 12589 |
. . . 4
⊢ ((3
∈ ℤ ∧ 2 ∈ ℤ) → (3 lcm 2) ∈
ℂ) |
| 8 | 4, 5, 7 | mp2an 692 |
. . 3
⊢ (3 lcm 2)
∈ ℂ |
| 9 | 4, 5 | pm3.2i 470 |
. . . . 5
⊢ (3 ∈
ℤ ∧ 2 ∈ ℤ) |
| 10 | | 2ne0 12370 |
. . . . . . 7
⊢ 2 ≠
0 |
| 11 | 10 | neii 2942 |
. . . . . 6
⊢ ¬ 2
= 0 |
| 12 | 11 | intnan 486 |
. . . . 5
⊢ ¬ (3
= 0 ∧ 2 = 0) |
| 13 | | gcdn0cl 16539 |
. . . . . 6
⊢ (((3
∈ ℤ ∧ 2 ∈ ℤ) ∧ ¬ (3 = 0 ∧ 2 = 0)) →
(3 gcd 2) ∈ ℕ) |
| 14 | 13 | nncnd 12282 |
. . . . 5
⊢ (((3
∈ ℤ ∧ 2 ∈ ℤ) ∧ ¬ (3 = 0 ∧ 2 = 0)) →
(3 gcd 2) ∈ ℂ) |
| 15 | 9, 12, 14 | mp2an 692 |
. . . 4
⊢ (3 gcd 2)
∈ ℂ |
| 16 | 9, 12, 13 | mp2an 692 |
. . . . 5
⊢ (3 gcd 2)
∈ ℕ |
| 17 | 16 | nnne0i 12306 |
. . . 4
⊢ (3 gcd 2)
≠ 0 |
| 18 | 15, 17 | pm3.2i 470 |
. . 3
⊢ ((3 gcd
2) ∈ ℂ ∧ (3 gcd 2) ≠ 0) |
| 19 | | 3nn 12345 |
. . . . . . 7
⊢ 3 ∈
ℕ |
| 20 | | 2nn 12339 |
. . . . . . 7
⊢ 2 ∈
ℕ |
| 21 | 19, 20 | pm3.2i 470 |
. . . . . 6
⊢ (3 ∈
ℕ ∧ 2 ∈ ℕ) |
| 22 | | lcmgcdnn 16648 |
. . . . . . 7
⊢ ((3
∈ ℕ ∧ 2 ∈ ℕ) → ((3 lcm 2) · (3 gcd 2)) =
(3 · 2)) |
| 23 | 22 | eqcomd 2743 |
. . . . . 6
⊢ ((3
∈ ℕ ∧ 2 ∈ ℕ) → (3 · 2) = ((3 lcm 2)
· (3 gcd 2))) |
| 24 | 21, 23 | mp1i 13 |
. . . . 5
⊢ (((3
· 2) ∈ ℂ ∧ (3 lcm 2) ∈ ℂ ∧ ((3 gcd 2)
∈ ℂ ∧ (3 gcd 2) ≠ 0)) → (3 · 2) = ((3 lcm 2)
· (3 gcd 2))) |
| 25 | | divmul3 11927 |
. . . . 5
⊢ (((3
· 2) ∈ ℂ ∧ (3 lcm 2) ∈ ℂ ∧ ((3 gcd 2)
∈ ℂ ∧ (3 gcd 2) ≠ 0)) → (((3 · 2) / (3 gcd 2)) =
(3 lcm 2) ↔ (3 · 2) = ((3 lcm 2) · (3 gcd
2)))) |
| 26 | 24, 25 | mpbird 257 |
. . . 4
⊢ (((3
· 2) ∈ ℂ ∧ (3 lcm 2) ∈ ℂ ∧ ((3 gcd 2)
∈ ℂ ∧ (3 gcd 2) ≠ 0)) → ((3 · 2) / (3 gcd 2)) =
(3 lcm 2)) |
| 27 | 26 | eqcomd 2743 |
. . 3
⊢ (((3
· 2) ∈ ℂ ∧ (3 lcm 2) ∈ ℂ ∧ ((3 gcd 2)
∈ ℂ ∧ (3 gcd 2) ≠ 0)) → (3 lcm 2) = ((3 · 2) / (3
gcd 2))) |
| 28 | 3, 8, 18, 27 | mp3an 1463 |
. 2
⊢ (3 lcm 2)
= ((3 · 2) / (3 gcd 2)) |
| 29 | | gcdcom 16550 |
. . . . 5
⊢ ((3
∈ ℤ ∧ 2 ∈ ℤ) → (3 gcd 2) = (2 gcd
3)) |
| 30 | 4, 5, 29 | mp2an 692 |
. . . 4
⊢ (3 gcd 2)
= (2 gcd 3) |
| 31 | | 1z 12647 |
. . . . . . . . 9
⊢ 1 ∈
ℤ |
| 32 | | gcdid 16564 |
. . . . . . . . 9
⊢ (1 ∈
ℤ → (1 gcd 1) = (abs‘1)) |
| 33 | 31, 32 | ax-mp 5 |
. . . . . . . 8
⊢ (1 gcd 1)
= (abs‘1) |
| 34 | | abs1 15336 |
. . . . . . . 8
⊢
(abs‘1) = 1 |
| 35 | 33, 34 | eqtr2i 2766 |
. . . . . . 7
⊢ 1 = (1
gcd 1) |
| 36 | | gcdadd 16563 |
. . . . . . . 8
⊢ ((1
∈ ℤ ∧ 1 ∈ ℤ) → (1 gcd 1) = (1 gcd (1 +
1))) |
| 37 | 31, 31, 36 | mp2an 692 |
. . . . . . 7
⊢ (1 gcd 1)
= (1 gcd (1 + 1)) |
| 38 | | 1p1e2 12391 |
. . . . . . . 8
⊢ (1 + 1) =
2 |
| 39 | 38 | oveq2i 7442 |
. . . . . . 7
⊢ (1 gcd (1
+ 1)) = (1 gcd 2) |
| 40 | 35, 37, 39 | 3eqtri 2769 |
. . . . . 6
⊢ 1 = (1
gcd 2) |
| 41 | | gcdcom 16550 |
. . . . . . 7
⊢ ((1
∈ ℤ ∧ 2 ∈ ℤ) → (1 gcd 2) = (2 gcd
1)) |
| 42 | 31, 5, 41 | mp2an 692 |
. . . . . 6
⊢ (1 gcd 2)
= (2 gcd 1) |
| 43 | | gcdadd 16563 |
. . . . . . 7
⊢ ((2
∈ ℤ ∧ 1 ∈ ℤ) → (2 gcd 1) = (2 gcd (1 +
2))) |
| 44 | 5, 31, 43 | mp2an 692 |
. . . . . 6
⊢ (2 gcd 1)
= (2 gcd (1 + 2)) |
| 45 | 40, 42, 44 | 3eqtri 2769 |
. . . . 5
⊢ 1 = (2
gcd (1 + 2)) |
| 46 | | 1p2e3 12409 |
. . . . . 6
⊢ (1 + 2) =
3 |
| 47 | 46 | oveq2i 7442 |
. . . . 5
⊢ (2 gcd (1
+ 2)) = (2 gcd 3) |
| 48 | 45, 47 | eqtr2i 2766 |
. . . 4
⊢ (2 gcd 3)
= 1 |
| 49 | 30, 48 | eqtri 2765 |
. . 3
⊢ (3 gcd 2)
= 1 |
| 50 | 49 | oveq2i 7442 |
. 2
⊢ ((3
· 2) / (3 gcd 2)) = ((3 · 2) / 1) |
| 51 | | 3t2e6 12432 |
. . . 4
⊢ (3
· 2) = 6 |
| 52 | 51 | oveq1i 7441 |
. . 3
⊢ ((3
· 2) / 1) = (6 / 1) |
| 53 | | 6cn 12357 |
. . . 4
⊢ 6 ∈
ℂ |
| 54 | 53 | div1i 11995 |
. . 3
⊢ (6 / 1) =
6 |
| 55 | 52, 54 | eqtri 2765 |
. 2
⊢ ((3
· 2) / 1) = 6 |
| 56 | 28, 50, 55 | 3eqtri 2769 |
1
⊢ (3 lcm 2)
= 6 |