| Step | Hyp | Ref
| Expression |
| 1 | | oveq2 5933 |
. . . . . . . . 9
⊢ (𝑥 = 𝑁 → (𝐴 /L 𝑥) = (𝐴 /L 𝑁)) |
| 2 | 1 | oveq1d 5940 |
. . . . . . . 8
⊢ (𝑥 = 𝑁 → ((𝐴 /L 𝑥) · (𝐴 /L 0)) = ((𝐴 /L 𝑁) · (𝐴 /L 0))) |
| 3 | 2 | eqeq2d 2208 |
. . . . . . 7
⊢ (𝑥 = 𝑁 → ((𝐴 /L 0) = ((𝐴 /L 𝑥) · (𝐴 /L 0)) ↔ (𝐴 /L 0) =
((𝐴 /L
𝑁) · (𝐴 /L
0)))) |
| 4 | | sq1 10742 |
. . . . . . . . . . . . . . . . 17
⊢
(1↑2) = 1 |
| 5 | 4 | eqeq2i 2207 |
. . . . . . . . . . . . . . . 16
⊢ ((𝐴↑2) = (1↑2) ↔
(𝐴↑2) =
1) |
| 6 | | nn0re 9275 |
. . . . . . . . . . . . . . . . . 18
⊢ (𝐴 ∈ ℕ0
→ 𝐴 ∈
ℝ) |
| 7 | | nn0ge0 9291 |
. . . . . . . . . . . . . . . . . 18
⊢ (𝐴 ∈ ℕ0
→ 0 ≤ 𝐴) |
| 8 | | 1re 8042 |
. . . . . . . . . . . . . . . . . . 19
⊢ 1 ∈
ℝ |
| 9 | | 0le1 8525 |
. . . . . . . . . . . . . . . . . . 19
⊢ 0 ≤
1 |
| 10 | | sq11 10721 |
. . . . . . . . . . . . . . . . . . 19
⊢ (((𝐴 ∈ ℝ ∧ 0 ≤
𝐴) ∧ (1 ∈ ℝ
∧ 0 ≤ 1)) → ((𝐴↑2) = (1↑2) ↔ 𝐴 = 1)) |
| 11 | 8, 9, 10 | mpanr12 439 |
. . . . . . . . . . . . . . . . . 18
⊢ ((𝐴 ∈ ℝ ∧ 0 ≤
𝐴) → ((𝐴↑2) = (1↑2) ↔
𝐴 = 1)) |
| 12 | 6, 7, 11 | syl2anc 411 |
. . . . . . . . . . . . . . . . 17
⊢ (𝐴 ∈ ℕ0
→ ((𝐴↑2) =
(1↑2) ↔ 𝐴 =
1)) |
| 13 | 12 | adantr 276 |
. . . . . . . . . . . . . . . 16
⊢ ((𝐴 ∈ ℕ0
∧ 𝑥 ∈ ℤ)
→ ((𝐴↑2) =
(1↑2) ↔ 𝐴 =
1)) |
| 14 | 5, 13 | bitr3id 194 |
. . . . . . . . . . . . . . 15
⊢ ((𝐴 ∈ ℕ0
∧ 𝑥 ∈ ℤ)
→ ((𝐴↑2) = 1
↔ 𝐴 =
1)) |
| 15 | 14 | biimpa 296 |
. . . . . . . . . . . . . 14
⊢ (((𝐴 ∈ ℕ0
∧ 𝑥 ∈ ℤ)
∧ (𝐴↑2) = 1)
→ 𝐴 =
1) |
| 16 | 15 | oveq1d 5940 |
. . . . . . . . . . . . 13
⊢ (((𝐴 ∈ ℕ0
∧ 𝑥 ∈ ℤ)
∧ (𝐴↑2) = 1)
→ (𝐴
/L 𝑥) =
(1 /L 𝑥)) |
| 17 | | 1lgs 15368 |
. . . . . . . . . . . . . 14
⊢ (𝑥 ∈ ℤ → (1
/L 𝑥) =
1) |
| 18 | 17 | ad2antlr 489 |
. . . . . . . . . . . . 13
⊢ (((𝐴 ∈ ℕ0
∧ 𝑥 ∈ ℤ)
∧ (𝐴↑2) = 1)
→ (1 /L 𝑥) = 1) |
| 19 | 16, 18 | eqtrd 2229 |
. . . . . . . . . . . 12
⊢ (((𝐴 ∈ ℕ0
∧ 𝑥 ∈ ℤ)
∧ (𝐴↑2) = 1)
→ (𝐴
/L 𝑥) =
1) |
| 20 | 19 | oveq1d 5940 |
. . . . . . . . . . 11
⊢ (((𝐴 ∈ ℕ0
∧ 𝑥 ∈ ℤ)
∧ (𝐴↑2) = 1)
→ ((𝐴
/L 𝑥)
· (𝐴
/L 0)) = (1 · (𝐴 /L 0))) |
| 21 | | nn0z 9363 |
. . . . . . . . . . . . . . 15
⊢ (𝐴 ∈ ℕ0
→ 𝐴 ∈
ℤ) |
| 22 | 21 | ad2antrr 488 |
. . . . . . . . . . . . . 14
⊢ (((𝐴 ∈ ℕ0
∧ 𝑥 ∈ ℤ)
∧ (𝐴↑2) = 1)
→ 𝐴 ∈
ℤ) |
| 23 | | 0z 9354 |
. . . . . . . . . . . . . 14
⊢ 0 ∈
ℤ |
| 24 | | lgscl 15339 |
. . . . . . . . . . . . . 14
⊢ ((𝐴 ∈ ℤ ∧ 0 ∈
ℤ) → (𝐴
/L 0) ∈ ℤ) |
| 25 | 22, 23, 24 | sylancl 413 |
. . . . . . . . . . . . 13
⊢ (((𝐴 ∈ ℕ0
∧ 𝑥 ∈ ℤ)
∧ (𝐴↑2) = 1)
→ (𝐴
/L 0) ∈ ℤ) |
| 26 | 25 | zcnd 9466 |
. . . . . . . . . . . 12
⊢ (((𝐴 ∈ ℕ0
∧ 𝑥 ∈ ℤ)
∧ (𝐴↑2) = 1)
→ (𝐴
/L 0) ∈ ℂ) |
| 27 | 26 | mulid2d 8062 |
. . . . . . . . . . 11
⊢ (((𝐴 ∈ ℕ0
∧ 𝑥 ∈ ℤ)
∧ (𝐴↑2) = 1)
→ (1 · (𝐴
/L 0)) = (𝐴 /L 0)) |
| 28 | 20, 27 | eqtr2d 2230 |
. . . . . . . . . 10
⊢ (((𝐴 ∈ ℕ0
∧ 𝑥 ∈ ℤ)
∧ (𝐴↑2) = 1)
→ (𝐴
/L 0) = ((𝐴 /L 𝑥) · (𝐴 /L 0))) |
| 29 | | lgscl 15339 |
. . . . . . . . . . . . . . 15
⊢ ((𝐴 ∈ ℤ ∧ 𝑥 ∈ ℤ) → (𝐴 /L 𝑥) ∈
ℤ) |
| 30 | 21, 29 | sylan 283 |
. . . . . . . . . . . . . 14
⊢ ((𝐴 ∈ ℕ0
∧ 𝑥 ∈ ℤ)
→ (𝐴
/L 𝑥)
∈ ℤ) |
| 31 | 30 | zcnd 9466 |
. . . . . . . . . . . . 13
⊢ ((𝐴 ∈ ℕ0
∧ 𝑥 ∈ ℤ)
→ (𝐴
/L 𝑥)
∈ ℂ) |
| 32 | 31 | adantr 276 |
. . . . . . . . . . . 12
⊢ (((𝐴 ∈ ℕ0
∧ 𝑥 ∈ ℤ)
∧ (𝐴↑2) ≠ 1)
→ (𝐴
/L 𝑥)
∈ ℂ) |
| 33 | 32 | mul01d 8436 |
. . . . . . . . . . 11
⊢ (((𝐴 ∈ ℕ0
∧ 𝑥 ∈ ℤ)
∧ (𝐴↑2) ≠ 1)
→ ((𝐴
/L 𝑥)
· 0) = 0) |
| 34 | 21 | adantr 276 |
. . . . . . . . . . . . . 14
⊢ ((𝐴 ∈ ℕ0
∧ 𝑥 ∈ ℤ)
→ 𝐴 ∈
ℤ) |
| 35 | | lgs0 15338 |
. . . . . . . . . . . . . 14
⊢ (𝐴 ∈ ℤ → (𝐴 /L 0) =
if((𝐴↑2) = 1, 1,
0)) |
| 36 | 34, 35 | syl 14 |
. . . . . . . . . . . . 13
⊢ ((𝐴 ∈ ℕ0
∧ 𝑥 ∈ ℤ)
→ (𝐴
/L 0) = if((𝐴↑2) = 1, 1, 0)) |
| 37 | | ifnefalse 3573 |
. . . . . . . . . . . . 13
⊢ ((𝐴↑2) ≠ 1 → if((𝐴↑2) = 1, 1, 0) =
0) |
| 38 | 36, 37 | sylan9eq 2249 |
. . . . . . . . . . . 12
⊢ (((𝐴 ∈ ℕ0
∧ 𝑥 ∈ ℤ)
∧ (𝐴↑2) ≠ 1)
→ (𝐴
/L 0) = 0) |
| 39 | 38 | oveq2d 5941 |
. . . . . . . . . . 11
⊢ (((𝐴 ∈ ℕ0
∧ 𝑥 ∈ ℤ)
∧ (𝐴↑2) ≠ 1)
→ ((𝐴
/L 𝑥)
· (𝐴
/L 0)) = ((𝐴 /L 𝑥) · 0)) |
| 40 | 33, 39, 38 | 3eqtr4rd 2240 |
. . . . . . . . . 10
⊢ (((𝐴 ∈ ℕ0
∧ 𝑥 ∈ ℤ)
∧ (𝐴↑2) ≠ 1)
→ (𝐴
/L 0) = ((𝐴 /L 𝑥) · (𝐴 /L 0))) |
| 41 | | zsqcl 10719 |
. . . . . . . . . . . . 13
⊢ (𝐴 ∈ ℤ → (𝐴↑2) ∈
ℤ) |
| 42 | 34, 41 | syl 14 |
. . . . . . . . . . . 12
⊢ ((𝐴 ∈ ℕ0
∧ 𝑥 ∈ ℤ)
→ (𝐴↑2) ∈
ℤ) |
| 43 | | 1z 9369 |
. . . . . . . . . . . 12
⊢ 1 ∈
ℤ |
| 44 | | zdceq 9418 |
. . . . . . . . . . . 12
⊢ (((𝐴↑2) ∈ ℤ ∧ 1
∈ ℤ) → DECID (𝐴↑2) = 1) |
| 45 | 42, 43, 44 | sylancl 413 |
. . . . . . . . . . 11
⊢ ((𝐴 ∈ ℕ0
∧ 𝑥 ∈ ℤ)
→ DECID (𝐴↑2) = 1) |
| 46 | | dcne 2378 |
. . . . . . . . . . 11
⊢
(DECID (𝐴↑2) = 1 ↔ ((𝐴↑2) = 1 ∨ (𝐴↑2) ≠ 1)) |
| 47 | 45, 46 | sylib 122 |
. . . . . . . . . 10
⊢ ((𝐴 ∈ ℕ0
∧ 𝑥 ∈ ℤ)
→ ((𝐴↑2) = 1 ∨
(𝐴↑2) ≠
1)) |
| 48 | 28, 40, 47 | mpjaodan 799 |
. . . . . . . . 9
⊢ ((𝐴 ∈ ℕ0
∧ 𝑥 ∈ ℤ)
→ (𝐴
/L 0) = ((𝐴 /L 𝑥) · (𝐴 /L 0))) |
| 49 | 48 | ralrimiva 2570 |
. . . . . . . 8
⊢ (𝐴 ∈ ℕ0
→ ∀𝑥 ∈
ℤ (𝐴
/L 0) = ((𝐴 /L 𝑥) · (𝐴 /L 0))) |
| 50 | 49 | 3ad2ant1 1020 |
. . . . . . 7
⊢ ((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
→ ∀𝑥 ∈
ℤ (𝐴
/L 0) = ((𝐴 /L 𝑥) · (𝐴 /L 0))) |
| 51 | | simp3 1001 |
. . . . . . 7
⊢ ((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
→ 𝑁 ∈
ℤ) |
| 52 | 3, 50, 51 | rspcdva 2873 |
. . . . . 6
⊢ ((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
→ (𝐴
/L 0) = ((𝐴 /L 𝑁) · (𝐴 /L 0))) |
| 53 | 52 | adantr 276 |
. . . . 5
⊢ (((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
∧ 𝑀 = 0) → (𝐴 /L 0) =
((𝐴 /L
𝑁) · (𝐴 /L
0))) |
| 54 | 21 | 3ad2ant1 1020 |
. . . . . . . . 9
⊢ ((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
→ 𝐴 ∈
ℤ) |
| 55 | 54, 23, 24 | sylancl 413 |
. . . . . . . 8
⊢ ((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
→ (𝐴
/L 0) ∈ ℤ) |
| 56 | 55 | zcnd 9466 |
. . . . . . 7
⊢ ((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
→ (𝐴
/L 0) ∈ ℂ) |
| 57 | 56 | adantr 276 |
. . . . . 6
⊢ (((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
∧ 𝑀 = 0) → (𝐴 /L 0) ∈
ℂ) |
| 58 | | lgscl 15339 |
. . . . . . . . 9
⊢ ((𝐴 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝐴 /L 𝑁) ∈
ℤ) |
| 59 | 54, 51, 58 | syl2anc 411 |
. . . . . . . 8
⊢ ((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
→ (𝐴
/L 𝑁)
∈ ℤ) |
| 60 | 59 | zcnd 9466 |
. . . . . . 7
⊢ ((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
→ (𝐴
/L 𝑁)
∈ ℂ) |
| 61 | 60 | adantr 276 |
. . . . . 6
⊢ (((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
∧ 𝑀 = 0) → (𝐴 /L 𝑁) ∈
ℂ) |
| 62 | 57, 61 | mulcomd 8065 |
. . . . 5
⊢ (((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
∧ 𝑀 = 0) → ((𝐴 /L 0)
· (𝐴
/L 𝑁)) =
((𝐴 /L
𝑁) · (𝐴 /L
0))) |
| 63 | 53, 62 | eqtr4d 2232 |
. . . 4
⊢ (((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
∧ 𝑀 = 0) → (𝐴 /L 0) =
((𝐴 /L 0)
· (𝐴
/L 𝑁))) |
| 64 | | oveq1 5932 |
. . . . . 6
⊢ (𝑀 = 0 → (𝑀 · 𝑁) = (0 · 𝑁)) |
| 65 | 51 | zcnd 9466 |
. . . . . . 7
⊢ ((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
→ 𝑁 ∈
ℂ) |
| 66 | 65 | mul02d 8435 |
. . . . . 6
⊢ ((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
→ (0 · 𝑁) =
0) |
| 67 | 64, 66 | sylan9eqr 2251 |
. . . . 5
⊢ (((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
∧ 𝑀 = 0) → (𝑀 · 𝑁) = 0) |
| 68 | 67 | oveq2d 5941 |
. . . 4
⊢ (((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
∧ 𝑀 = 0) → (𝐴 /L (𝑀 · 𝑁)) = (𝐴 /L 0)) |
| 69 | | simpr 110 |
. . . . . 6
⊢ (((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
∧ 𝑀 = 0) → 𝑀 = 0) |
| 70 | 69 | oveq2d 5941 |
. . . . 5
⊢ (((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
∧ 𝑀 = 0) → (𝐴 /L 𝑀) = (𝐴 /L 0)) |
| 71 | 70 | oveq1d 5940 |
. . . 4
⊢ (((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
∧ 𝑀 = 0) → ((𝐴 /L 𝑀) · (𝐴 /L 𝑁)) = ((𝐴 /L 0) · (𝐴 /L 𝑁))) |
| 72 | 63, 68, 71 | 3eqtr4d 2239 |
. . 3
⊢ (((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
∧ 𝑀 = 0) → (𝐴 /L (𝑀 · 𝑁)) = ((𝐴 /L 𝑀) · (𝐴 /L 𝑁))) |
| 73 | | oveq2 5933 |
. . . . . . . 8
⊢ (𝑥 = 𝑀 → (𝐴 /L 𝑥) = (𝐴 /L 𝑀)) |
| 74 | 73 | oveq1d 5940 |
. . . . . . 7
⊢ (𝑥 = 𝑀 → ((𝐴 /L 𝑥) · (𝐴 /L 0)) = ((𝐴 /L 𝑀) · (𝐴 /L 0))) |
| 75 | 74 | eqeq2d 2208 |
. . . . . 6
⊢ (𝑥 = 𝑀 → ((𝐴 /L 0) = ((𝐴 /L 𝑥) · (𝐴 /L 0)) ↔ (𝐴 /L 0) =
((𝐴 /L
𝑀) · (𝐴 /L
0)))) |
| 76 | | simp2 1000 |
. . . . . 6
⊢ ((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
→ 𝑀 ∈
ℤ) |
| 77 | 75, 50, 76 | rspcdva 2873 |
. . . . 5
⊢ ((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
→ (𝐴
/L 0) = ((𝐴 /L 𝑀) · (𝐴 /L 0))) |
| 78 | 77 | adantr 276 |
. . . 4
⊢ (((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
∧ 𝑁 = 0) → (𝐴 /L 0) =
((𝐴 /L
𝑀) · (𝐴 /L
0))) |
| 79 | | oveq2 5933 |
. . . . . 6
⊢ (𝑁 = 0 → (𝑀 · 𝑁) = (𝑀 · 0)) |
| 80 | 76 | zcnd 9466 |
. . . . . . 7
⊢ ((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
→ 𝑀 ∈
ℂ) |
| 81 | 80 | mul01d 8436 |
. . . . . 6
⊢ ((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
→ (𝑀 · 0) =
0) |
| 82 | 79, 81 | sylan9eqr 2251 |
. . . . 5
⊢ (((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
∧ 𝑁 = 0) → (𝑀 · 𝑁) = 0) |
| 83 | 82 | oveq2d 5941 |
. . . 4
⊢ (((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
∧ 𝑁 = 0) → (𝐴 /L (𝑀 · 𝑁)) = (𝐴 /L 0)) |
| 84 | | simpr 110 |
. . . . . 6
⊢ (((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
∧ 𝑁 = 0) → 𝑁 = 0) |
| 85 | 84 | oveq2d 5941 |
. . . . 5
⊢ (((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
∧ 𝑁 = 0) → (𝐴 /L 𝑁) = (𝐴 /L 0)) |
| 86 | 85 | oveq2d 5941 |
. . . 4
⊢ (((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
∧ 𝑁 = 0) → ((𝐴 /L 𝑀) · (𝐴 /L 𝑁)) = ((𝐴 /L 𝑀) · (𝐴 /L 0))) |
| 87 | 78, 83, 86 | 3eqtr4d 2239 |
. . 3
⊢ (((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
∧ 𝑁 = 0) → (𝐴 /L (𝑀 · 𝑁)) = ((𝐴 /L 𝑀) · (𝐴 /L 𝑁))) |
| 88 | 72, 87 | jaodan 798 |
. 2
⊢ (((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
∧ (𝑀 = 0 ∨ 𝑁 = 0)) → (𝐴 /L (𝑀 · 𝑁)) = ((𝐴 /L 𝑀) · (𝐴 /L 𝑁))) |
| 89 | | neanior 2454 |
. . 3
⊢ ((𝑀 ≠ 0 ∧ 𝑁 ≠ 0) ↔ ¬ (𝑀 = 0 ∨ 𝑁 = 0)) |
| 90 | | lgsdi 15362 |
. . . 4
⊢ (((𝐴 ∈ ℤ ∧ 𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) ∧ (𝑀 ≠ 0 ∧ 𝑁 ≠ 0)) → (𝐴 /L (𝑀 · 𝑁)) = ((𝐴 /L 𝑀) · (𝐴 /L 𝑁))) |
| 91 | 21, 90 | syl3anl1 1297 |
. . 3
⊢ (((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
∧ (𝑀 ≠ 0 ∧ 𝑁 ≠ 0)) → (𝐴 /L (𝑀 · 𝑁)) = ((𝐴 /L 𝑀) · (𝐴 /L 𝑁))) |
| 92 | 89, 91 | sylan2br 288 |
. 2
⊢ (((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
∧ ¬ (𝑀 = 0 ∨
𝑁 = 0)) → (𝐴 /L (𝑀 · 𝑁)) = ((𝐴 /L 𝑀) · (𝐴 /L 𝑁))) |
| 93 | | zdceq 9418 |
. . . . 5
⊢ ((𝑀 ∈ ℤ ∧ 0 ∈
ℤ) → DECID 𝑀 = 0) |
| 94 | 76, 23, 93 | sylancl 413 |
. . . 4
⊢ ((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
→ DECID 𝑀 = 0) |
| 95 | | zdceq 9418 |
. . . . 5
⊢ ((𝑁 ∈ ℤ ∧ 0 ∈
ℤ) → DECID 𝑁 = 0) |
| 96 | 51, 23, 95 | sylancl 413 |
. . . 4
⊢ ((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
→ DECID 𝑁 = 0) |
| 97 | | dcor 937 |
. . . 4
⊢
(DECID 𝑀 = 0 → (DECID 𝑁 = 0 → DECID
(𝑀 = 0 ∨ 𝑁 = 0))) |
| 98 | 94, 96, 97 | sylc 62 |
. . 3
⊢ ((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
→ DECID (𝑀 = 0 ∨ 𝑁 = 0)) |
| 99 | | exmiddc 837 |
. . 3
⊢
(DECID (𝑀 = 0 ∨ 𝑁 = 0) → ((𝑀 = 0 ∨ 𝑁 = 0) ∨ ¬ (𝑀 = 0 ∨ 𝑁 = 0))) |
| 100 | 98, 99 | syl 14 |
. 2
⊢ ((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
→ ((𝑀 = 0 ∨ 𝑁 = 0) ∨ ¬ (𝑀 = 0 ∨ 𝑁 = 0))) |
| 101 | 88, 92, 100 | mpjaodan 799 |
1
⊢ ((𝐴 ∈ ℕ0
∧ 𝑀 ∈ ℤ
∧ 𝑁 ∈ ℤ)
→ (𝐴
/L (𝑀
· 𝑁)) = ((𝐴 /L 𝑀) · (𝐴 /L 𝑁))) |