Proof of Theorem divdivdivt
| Step | Hyp | Ref
| Expression |
| 1 | | axmulcom 4071 |
. . . . . . 7
⊢ (((D /
C) ∈ ℂ ∧ (A / B) ∈
ℂ) → ((D / C) · (A /
B)) = ((A / B) ·
(D / C))) |
| 2 | | divclt 4223 |
. . . . . . . . . . 11
⊢ (((D
∈ ℂ ∧ C ∈ ℂ)
∧ C ≠ 0) → (D / C) ∈
ℂ) |
| 3 | | ancom 333 |
. . . . . . . . . . 11
⊢ ((C
∈ ℂ ∧ D ∈ ℂ)
↔ (D ∈ ℂ ∧ C ∈ ℂ)) |
| 4 | 2, 3 | sylanb 344 |
. . . . . . . . . 10
⊢ (((C
∈ ℂ ∧ D ∈ ℂ)
∧ C ≠ 0) → (D / C) ∈
ℂ) |
| 5 | 4 | adantrr 312 |
. . . . . . . . 9
⊢ (((C
∈ ℂ ∧ D ∈ ℂ)
∧ (C ≠ 0 ∧ D ≠ 0)) → (D / C) ∈
ℂ) |
| 6 | 5 | adantrl 311 |
. . . . . . . 8
⊢ (((C
∈ ℂ ∧ D ∈ ℂ)
∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → (D / C) ∈ ℂ) |
| 7 | 6 | adantll 309 |
. . . . . . 7
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) ∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → (D / C) ∈ ℂ) |
| 8 | | divclt 4223 |
. . . . . . . . 9
⊢ (((A
∈ ℂ ∧ B ∈ ℂ)
∧ B ≠ 0) → (A / B) ∈
ℂ) |
| 9 | 8 | adantrr 312 |
. . . . . . . 8
⊢ (((A
∈ ℂ ∧ B ∈ ℂ)
∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → (A / B) ∈ ℂ) |
| 10 | 9 | adantlr 310 |
. . . . . . 7
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) ∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → (A / B) ∈ ℂ) |
| 11 | 1, 7, 10 | sylanc 361 |
. . . . . 6
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) ∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → ((D / C) · (A /
B)) = ((A / B) ·
(D / C))) |
| 12 | | divmuldivt 4263 |
. . . . . . 7
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (D ∈ ℂ ∧ C ∈ ℂ)) ∧ (B ≠ 0 ∧ C
≠ 0)) → ((A / B) · (D /
C)) = ((A · D) /
(B · C))) |
| 13 | 3 | biimp 133 |
. . . . . . . 8
⊢ ((C
∈ ℂ ∧ D ∈ ℂ)
→ (D ∈ ℂ ∧ C ∈ ℂ)) |
| 14 | 13 | anim2i 270 |
. . . . . . 7
⊢ (((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) → ((A ∈ ℂ ∧ B ∈ ℂ) ∧ (D ∈ ℂ ∧ C ∈ ℂ))) |
| 15 | | pm3.26 256 |
. . . . . . . 8
⊢ ((C
≠ 0 ∧ D ≠ 0) → C ≠ 0) |
| 16 | 15 | anim2i 270 |
. . . . . . 7
⊢ ((B
≠ 0 ∧ (C ≠ 0 ∧ D ≠ 0)) → (B ≠ 0 ∧ C
≠ 0)) |
| 17 | 12, 14, 16 | syl2an 349 |
. . . . . 6
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) ∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → ((A / B) · (D /
C)) = ((A · D) /
(B · C))) |
| 18 | 11, 17 | eqtrd 1128 |
. . . . 5
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) ∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → ((D / C) · (A /
B)) = ((A · D) /
(B · C))) |
| 19 | 18 | opreq2d 3013 |
. . . 4
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) ∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → ((C / D) · ((D
/ C) · (A / B))) =
((C / D) · ((A
· D) / (B · C)))) |
| 20 | 13 | ancli 244 |
. . . . . . . . . 10
⊢ ((C
∈ ℂ ∧ D ∈ ℂ)
→ ((C ∈ ℂ ∧ D ∈ ℂ) ∧ (D ∈ ℂ ∧ C ∈ ℂ))) |
| 21 | | ancom 333 |
. . . . . . . . . . . 12
⊢ ((C
≠ 0 ∧ D ≠ 0) ↔ (D ≠ 0 ∧ C
≠ 0)) |
| 22 | 21 | biimp 133 |
. . . . . . . . . . 11
⊢ ((C
≠ 0 ∧ D ≠ 0) → (D ≠ 0 ∧ C
≠ 0)) |
| 23 | 22 | adantl 305 |
. . . . . . . . . 10
⊢ ((B
≠ 0 ∧ (C ≠ 0 ∧ D ≠ 0)) → (D ≠ 0 ∧ C
≠ 0)) |
| 24 | 20, 23 | anim12i 268 |
. . . . . . . . 9
⊢ (((C
∈ ℂ ∧ D ∈ ℂ)
∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → (((C ∈ ℂ ∧
D ∈ ℂ) ∧ (D ∈ ℂ ∧ C ∈ ℂ)) ∧ (D ≠ 0 ∧ C
≠ 0))) |
| 25 | 24 | adantll 309 |
. . . . . . . 8
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) ∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → (((C ∈ ℂ ∧
D ∈ ℂ) ∧ (D ∈ ℂ ∧ C ∈ ℂ)) ∧ (D ≠ 0 ∧ C
≠ 0))) |
| 26 | | divmuldivt 4263 |
. . . . . . . 8
⊢ ((((C
∈ ℂ ∧ D ∈ ℂ)
∧ (D ∈ ℂ ∧ C ∈ ℂ)) ∧ (D ≠ 0 ∧ C
≠ 0)) → ((C / D) · (D /
C)) = ((C · D) /
(D · C))) |
| 27 | 25, 26 | syl 12 |
. . . . . . 7
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) ∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → ((C / D) · (D /
C)) = ((C · D) /
(D · C))) |
| 28 | | axmulcom 4071 |
. . . . . . . . 9
⊢ ((C
∈ ℂ ∧ D ∈ ℂ)
→ (C · D) = (D ·
C)) |
| 29 | 28 | ad2antlr 321 |
. . . . . . . 8
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) ∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → (C · D) = (D ·
C)) |
| 30 | 29 | opreq1d 3012 |
. . . . . . 7
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) ∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → ((C · D) / (D ·
C)) = ((D · C) /
(D · C))) |
| 31 | | dividt 4256 |
. . . . . . . 8
⊢ (((D
· C) ∈ ℂ ∧ (D · C)
≠ 0) → ((D · C) / (D ·
C)) = 1) |
| 32 | | axmulcl 4068 |
. . . . . . . . . 10
⊢ ((D
∈ ℂ ∧ C ∈ ℂ)
→ (D · C) ∈ ℂ) |
| 33 | 32 | ancoms 334 |
. . . . . . . . 9
⊢ ((C
∈ ℂ ∧ D ∈ ℂ)
→ (D · C) ∈ ℂ) |
| 34 | 33 | ad2antlr 321 |
. . . . . . . 8
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) ∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → (D · C) ∈ ℂ) |
| 35 | | muln0bt 4213 |
. . . . . . . . . . . . 13
⊢ ((D
∈ ℂ ∧ C ∈ ℂ)
→ ((D ≠ 0 ∧ C ≠ 0) ↔ (D · C)
≠ 0)) |
| 36 | 35, 21 | syl5bb 410 |
. . . . . . . . . . . 12
⊢ ((D
∈ ℂ ∧ C ∈ ℂ)
→ ((C ≠ 0 ∧ D ≠ 0) ↔ (D · C)
≠ 0)) |
| 37 | 36 | ancoms 334 |
. . . . . . . . . . 11
⊢ ((C
∈ ℂ ∧ D ∈ ℂ)
→ ((C ≠ 0 ∧ D ≠ 0) ↔ (D · C)
≠ 0)) |
| 38 | 37 | biimpa 324 |
. . . . . . . . . 10
⊢ (((C
∈ ℂ ∧ D ∈ ℂ)
∧ (C ≠ 0 ∧ D ≠ 0)) → (D · C)
≠ 0) |
| 39 | 38 | adantrl 311 |
. . . . . . . . 9
⊢ (((C
∈ ℂ ∧ D ∈ ℂ)
∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → (D · C) ≠ 0) |
| 40 | 39 | adantll 309 |
. . . . . . . 8
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) ∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → (D · C) ≠ 0) |
| 41 | 31, 34, 40 | sylanc 361 |
. . . . . . 7
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) ∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → ((D · C) / (D ·
C)) = 1) |
| 42 | 27, 30, 41 | 3eqtrd 1132 |
. . . . . 6
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) ∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → ((C / D) · (D /
C)) = 1) |
| 43 | 42 | opreq1d 3012 |
. . . . 5
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) ∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → (((C / D) · (D /
C)) · (A / B)) = (1
· (A / B))) |
| 44 | | axmulass 4073 |
. . . . . 6
⊢ (((C /
D) ∈ ℂ ∧ (D / C) ∈
ℂ ∧ (A / B) ∈ ℂ) → (((C / D) ·
(D / C)) · (A
/ B)) = ((C / D) ·
((D / C) · (A /
B)))) |
| 45 | | divclt 4223 |
. . . . . . . . 9
⊢ (((C
∈ ℂ ∧ D ∈ ℂ)
∧ D ≠ 0) → (C / D) ∈
ℂ) |
| 46 | 45 | adantrl 311 |
. . . . . . . 8
⊢ (((C
∈ ℂ ∧ D ∈ ℂ)
∧ (C ≠ 0 ∧ D ≠ 0)) → (C / D) ∈
ℂ) |
| 47 | 46 | adantrl 311 |
. . . . . . 7
⊢ (((C
∈ ℂ ∧ D ∈ ℂ)
∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → (C / D) ∈ ℂ) |
| 48 | 47 | adantll 309 |
. . . . . 6
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) ∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → (C / D) ∈ ℂ) |
| 49 | 44, 48, 7, 10 | syl3anc 629 |
. . . . 5
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) ∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → (((C / D) · (D /
C)) · (A / B)) =
((C / D) · ((D
/ C) · (A / B)))) |
| 50 | | mulid2t 4175 |
. . . . . 6
⊢ ((A /
B) ∈ ℂ → (1 ·
(A / B)) = (A /
B)) |
| 51 | 10, 50 | syl 12 |
. . . . 5
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) ∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → (1 · (A / B)) = (A /
B)) |
| 52 | 43, 49, 51 | 3eqtr3d 1133 |
. . . 4
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) ∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → ((C / D) · ((D
/ C) · (A / B))) =
(A / B)) |
| 53 | 19, 52 | eqtr3d 1130 |
. . 3
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) ∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → ((C / D) · ((A
· D) / (B · C)))
= (A / B)) |
| 54 | | divmult 4220 |
. . . 4
⊢ ((((A
/ B) ∈ ℂ ∧ (C / D) ∈
ℂ ∧ ((A · D) / (B ·
C)) ∈ ℂ) ∧ (C / D) ≠ 0)
→ (((A / B) / (C /
D)) = ((A · D) /
(B · C)) ↔ ((C /
D) · ((A · D) /
(B · C))) = (A /
B))) |
| 55 | | divclt 4223 |
. . . . . 6
⊢ ((((A
· D) ∈ ℂ ∧ (B · C)
∈ ℂ) ∧ (B · C) ≠ 0) → ((A · D) /
(B · C)) ∈ ℂ) |
| 56 | | axmulcl 4068 |
. . . . . . . . . 10
⊢ ((A
∈ ℂ ∧ D ∈ ℂ)
→ (A · D) ∈ ℂ) |
| 57 | 56 | adantrl 311 |
. . . . . . . . 9
⊢ ((A
∈ ℂ ∧ (C ∈ ℂ
∧ D ∈ ℂ)) → (A · D)
∈ ℂ) |
| 58 | 57 | adantlr 310 |
. . . . . . . 8
⊢ (((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) → (A · D)
∈ ℂ) |
| 59 | | axmulcl 4068 |
. . . . . . . . . 10
⊢ ((B
∈ ℂ ∧ C ∈ ℂ)
→ (B · C) ∈ ℂ) |
| 60 | 59 | adantrr 312 |
. . . . . . . . 9
⊢ ((B
∈ ℂ ∧ (C ∈ ℂ
∧ D ∈ ℂ)) → (B · C)
∈ ℂ) |
| 61 | 60 | adantll 309 |
. . . . . . . 8
⊢ (((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) → (B · C)
∈ ℂ) |
| 62 | 58, 61 | jca 236 |
. . . . . . 7
⊢ (((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) → ((A · D)
∈ ℂ ∧ (B · C) ∈ ℂ)) |
| 63 | 62 | adantr 306 |
. . . . . 6
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) ∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → ((A · D) ∈ ℂ ∧ (B · C)
∈ ℂ)) |
| 64 | | muln0bt 4213 |
. . . . . . . . . . 11
⊢ ((B
∈ ℂ ∧ C ∈ ℂ)
→ ((B ≠ 0 ∧ C ≠ 0) ↔ (B · C)
≠ 0)) |
| 65 | 64 | biimpd 135 |
. . . . . . . . . 10
⊢ ((B
∈ ℂ ∧ C ∈ ℂ)
→ ((B ≠ 0 ∧ C ≠ 0) → (B · C)
≠ 0)) |
| 66 | 65, 15 | sylan2i 357 |
. . . . . . . . 9
⊢ ((B
∈ ℂ ∧ C ∈ ℂ)
→ ((B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0)) → (B · C) ≠ 0)) |
| 67 | 66 | adantrr 312 |
. . . . . . . 8
⊢ ((B
∈ ℂ ∧ (C ∈ ℂ
∧ D ∈ ℂ)) → ((B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0)) → (B · C) ≠ 0)) |
| 68 | 67 | adantll 309 |
. . . . . . 7
⊢ (((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) → ((B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0)) → (B · C) ≠ 0)) |
| 69 | 68 | imp 277 |
. . . . . 6
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) ∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → (B · C) ≠ 0) |
| 70 | 55, 63, 69 | sylanc 361 |
. . . . 5
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) ∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → ((A · D) / (B ·
C)) ∈ ℂ) |
| 71 | 10, 48, 70 | 3jca 604 |
. . . 4
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) ∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → ((A / B) ∈ ℂ ∧ (C / D) ∈
ℂ ∧ ((A · D) / (B ·
C)) ∈ ℂ)) |
| 72 | | divneq0bt 4230 |
. . . . . . . . 9
⊢ (((C
∈ ℂ ∧ D ∈ ℂ)
∧ D ≠ 0) → (C ≠ 0 ↔ (C / D) ≠
0)) |
| 73 | 72 | biimpa 324 |
. . . . . . . 8
⊢ ((((C
∈ ℂ ∧ D ∈ ℂ)
∧ D ≠ 0) ∧ C ≠ 0) → (C / D) ≠
0) |
| 74 | 73 | an1rs 373 |
. . . . . . 7
⊢ ((((C
∈ ℂ ∧ D ∈ ℂ)
∧ C ≠ 0) ∧ D ≠ 0) → (C / D) ≠
0) |
| 75 | 74 | anasss 337 |
. . . . . 6
⊢ (((C
∈ ℂ ∧ D ∈ ℂ)
∧ (C ≠ 0 ∧ D ≠ 0)) → (C / D) ≠
0) |
| 76 | 75 | adantrl 311 |
. . . . 5
⊢ (((C
∈ ℂ ∧ D ∈ ℂ)
∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → (C / D) ≠ 0) |
| 77 | 76 | adantll 309 |
. . . 4
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) ∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → (C / D) ≠ 0) |
| 78 | 54, 71, 77 | sylanc 361 |
. . 3
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) ∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → (((A / B) / (C /
D)) = ((A · D) /
(B · C)) ↔ ((C /
D) · ((A · D) /
(B · C))) = (A /
B))) |
| 79 | 53, 78 | mpbird 171 |
. 2
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) ∧ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) → ((A / B) / (C /
D)) = ((A · D) /
(B · C))) |
| 80 | | 3anass 585 |
. 2
⊢ ((B
≠ 0 ∧ C ≠ 0 ∧ D ≠ 0) ↔ (B ≠ 0 ∧ (C ≠ 0 ∧ D
≠ 0))) |
| 81 | 79, 80 | sylan2b 347 |
1
⊢ ((((A
∈ ℂ ∧ B ∈ ℂ)
∧ (C ∈ ℂ ∧ D ∈ ℂ)) ∧ (B ≠ 0 ∧ C
≠ 0 ∧ D ≠ 0)) → ((A / B) /
(C / D)) = ((A
· D) / (B · C))) |