Proof of Theorem divdistrt
| Step | Hyp | Ref
| Expression |
| 1 | | opreq1 3006 |
. . . . . 6
⊢ (A =
if(A ∈ ℂ, A, 0) → (A
+ B) = (if(A ∈ ℂ, A, 0) + B)) |
| 2 | 1 | opreq1d 3012 |
. . . . 5
⊢ (A =
if(A ∈ ℂ, A, 0) → ((A
+ B) / C) = ((if(A
∈ ℂ, A, 0) + B) / C)) |
| 3 | | opreq1 3006 |
. . . . . 6
⊢ (A =
if(A ∈ ℂ, A, 0) → (A
/ C) = (if(A ∈ ℂ, A, 0) / C)) |
| 4 | 3 | opreq1d 3012 |
. . . . 5
⊢ (A =
if(A ∈ ℂ, A, 0) → ((A
/ C) + (B / C)) =
((if(A ∈ ℂ, A, 0) / C) +
(B / C))) |
| 5 | 2, 4 | cleq12d 1115 |
. . . 4
⊢ (A =
if(A ∈ ℂ, A, 0) → (((A + B) /
C) = ((A / C) +
(B / C)) ↔ ((if(A ∈ ℂ, A, 0) + B) /
C) = ((if(A ∈ ℂ, A, 0) / C) +
(B / C)))) |
| 6 | 5 | imbi2d 464 |
. . 3
⊢ (A =
if(A ∈ ℂ, A, 0) → ((C
≠ 0 → ((A + B) / C) =
((A / C) + (B /
C))) ↔ (C ≠ 0 → ((if(A ∈ ℂ, A, 0) + B) /
C) = ((if(A ∈ ℂ, A, 0) / C) +
(B / C))))) |
| 7 | | opreq2 3007 |
. . . . . 6
⊢ (B =
if(B ∈ ℂ, B, 0) → (if(A ∈ ℂ, A, 0) + B) =
(if(A ∈ ℂ, A, 0) + if(B
∈ ℂ, B, 0))) |
| 8 | 7 | opreq1d 3012 |
. . . . 5
⊢ (B =
if(B ∈ ℂ, B, 0) → ((if(A ∈ ℂ, A, 0) + B) /
C) = ((if(A ∈ ℂ, A, 0) + if(B
∈ ℂ, B, 0)) / C)) |
| 9 | | opreq1 3006 |
. . . . . 6
⊢ (B =
if(B ∈ ℂ, B, 0) → (B
/ C) = (if(B ∈ ℂ, B, 0) / C)) |
| 10 | 9 | opreq2d 3013 |
. . . . 5
⊢ (B =
if(B ∈ ℂ, B, 0) → ((if(A ∈ ℂ, A, 0) / C) +
(B / C)) = ((if(A
∈ ℂ, A, 0) / C) + (if(B
∈ ℂ, B, 0) / C))) |
| 11 | 8, 10 | cleq12d 1115 |
. . . 4
⊢ (B =
if(B ∈ ℂ, B, 0) → (((if(A ∈ ℂ, A, 0) + B) /
C) = ((if(A ∈ ℂ, A, 0) / C) +
(B / C)) ↔ ((if(A ∈ ℂ, A, 0) + if(B
∈ ℂ, B, 0)) / C) = ((if(A
∈ ℂ, A, 0) / C) + (if(B
∈ ℂ, B, 0) / C)))) |
| 12 | 11 | imbi2d 464 |
. . 3
⊢ (B =
if(B ∈ ℂ, B, 0) → ((C
≠ 0 → ((if(A ∈ ℂ,
A, 0) + B) / C) =
((if(A ∈ ℂ, A, 0) / C) +
(B / C))) ↔ (C
≠ 0 → ((if(A ∈ ℂ,
A, 0) + if(B ∈ ℂ, B, 0)) / C) =
((if(A ∈ ℂ, A, 0) / C) +
(if(B ∈ ℂ, B, 0) / C))))) |
| 13 | | neeq1 1194 |
. . . 4
⊢ (C =
if(C ∈ ℂ, C, 0) → (C
≠ 0 ↔ if(C ∈ ℂ, C, 0) ≠ 0)) |
| 14 | | opreq2 3007 |
. . . . 5
⊢ (C =
if(C ∈ ℂ, C, 0) → ((if(A ∈ ℂ, A, 0) + if(B
∈ ℂ, B, 0)) / C) = ((if(A
∈ ℂ, A, 0) + if(B ∈ ℂ, B, 0)) / if(C
∈ ℂ, C, 0))) |
| 15 | | opreq2 3007 |
. . . . . 6
⊢ (C =
if(C ∈ ℂ, C, 0) → (if(A ∈ ℂ, A, 0) / C) =
(if(A ∈ ℂ, A, 0) / if(C
∈ ℂ, C, 0))) |
| 16 | | opreq2 3007 |
. . . . . 6
⊢ (C =
if(C ∈ ℂ, C, 0) → (if(B ∈ ℂ, B, 0) / C) =
(if(B ∈ ℂ, B, 0) / if(C
∈ ℂ, C, 0))) |
| 17 | 15, 16 | opreq12d 3014 |
. . . . 5
⊢ (C =
if(C ∈ ℂ, C, 0) → ((if(A ∈ ℂ, A, 0) / C) +
(if(B ∈ ℂ, B, 0) / C)) =
((if(A ∈ ℂ, A, 0) / if(C
∈ ℂ, C, 0)) + (if(B ∈ ℂ, B, 0) / if(C
∈ ℂ, C, 0)))) |
| 18 | 14, 17 | cleq12d 1115 |
. . . 4
⊢ (C =
if(C ∈ ℂ, C, 0) → (((if(A ∈ ℂ, A, 0) + if(B
∈ ℂ, B, 0)) / C) = ((if(A
∈ ℂ, A, 0) / C) + (if(B
∈ ℂ, B, 0) / C)) ↔ ((if(A ∈ ℂ, A, 0) + if(B
∈ ℂ, B, 0)) / if(C ∈ ℂ, C, 0)) = ((if(A
∈ ℂ, A, 0) / if(C ∈ ℂ, C, 0)) + (if(B
∈ ℂ, B, 0) / if(C ∈ ℂ, C, 0))))) |
| 19 | 13, 18 | imbi12d 474 |
. . 3
⊢ (C =
if(C ∈ ℂ, C, 0) → ((C
≠ 0 → ((if(A ∈ ℂ,
A, 0) + if(B ∈ ℂ, B, 0)) / C) =
((if(A ∈ ℂ, A, 0) / C) +
(if(B ∈ ℂ, B, 0) / C)))
↔ (if(C ∈ ℂ, C, 0) ≠ 0 → ((if(A ∈ ℂ, A, 0) + if(B
∈ ℂ, B, 0)) / if(C ∈ ℂ, C, 0)) = ((if(A
∈ ℂ, A, 0) / if(C ∈ ℂ, C, 0)) + (if(B
∈ ℂ, B, 0) / if(C ∈ ℂ, C, 0)))))) |
| 20 | | 0cn 4100 |
. . . . 5
⊢ 0 ∈ ℂ |
| 21 | 20 | elimel 1793 |
. . . 4
⊢ if(A
∈ ℂ, A, 0) ∈
ℂ |
| 22 | 20 | elimel 1793 |
. . . 4
⊢ if(B
∈ ℂ, B, 0) ∈
ℂ |
| 23 | 20 | elimel 1793 |
. . . 4
⊢ if(C
∈ ℂ, C, 0) ∈
ℂ |
| 24 | 21, 22, 23 | divdistrz 4245 |
. . 3
⊢ (if(C
∈ ℂ, C, 0) ≠ 0 →
((if(A ∈ ℂ, A, 0) + if(B
∈ ℂ, B, 0)) / if(C ∈ ℂ, C, 0)) = ((if(A
∈ ℂ, A, 0) / if(C ∈ ℂ, C, 0)) + (if(B
∈ ℂ, B, 0) / if(C ∈ ℂ, C, 0)))) |
| 25 | 6, 12, 19, 24 | dedth3h 1788 |
. 2
⊢ ((A
∈ ℂ ∧ B ∈ ℂ ∧
C ∈ ℂ) → (C ≠ 0 → ((A + B) /
C) = ((A / C) +
(B / C)))) |
| 26 | 25 | imp 277 |
1
⊢ (((A
∈ ℂ ∧ B ∈ ℂ ∧
C ∈ ℂ) ∧ C ≠ 0) → ((A + B) /
C) = ((A / C) +
(B / C))) |