Proof of Theorem halfpm6th
| Step | Hyp | Ref
| Expression |
| 1 | | 3nn 6002 |
. . . . . . 7
⊢ 3 ∈ ℕ |
| 2 | 1 | nncn 5934 |
. . . . . 6
⊢ 3 ∈ ℂ |
| 3 | | ax1cn 5281 |
. . . . . 6
⊢ 1 ∈ ℂ |
| 4 | | 2cn 5982 |
. . . . . 6
⊢ 2 ∈ ℂ |
| 5 | 1 | nnne0 5953 |
. . . . . 6
⊢ 3 ≠ 0 |
| 6 | | 2ne0 5992 |
. . . . . 6
⊢ 2 ≠ 0 |
| 7 | 2, 2, 3, 4, 5, 6 | divmuldiv 5788 |
. . . . 5
⊢ ((3 / 3) · (1 / 2))
= ((3 · 1) / (3 · 2)) |
| 8 | 2, 5 | divid 5771 |
. . . . . . 7
⊢ (3 / 3) = 1 |
| 9 | 8 | opreq1i 3977 |
. . . . . 6
⊢ ((3 / 3) · (1 / 2))
= (1 · (1 / 2)) |
| 10 | | 2re 5981 |
. . . . . . . . 9
⊢ 2 ∈ ℝ |
| 11 | 10, 6 | rereccl 5803 |
. . . . . . . 8
⊢ (1 / 2) ∈ ℝ |
| 12 | 11 | recn 5326 |
. . . . . . 7
⊢ (1 / 2) ∈ ℂ |
| 13 | 12 | mulid2 5345 |
. . . . . 6
⊢ (1 · (1 / 2)) = (1
/ 2) |
| 14 | 9, 13 | eqtr 1498 |
. . . . 5
⊢ ((3 / 3) · (1 / 2))
= (1 / 2) |
| 15 | 2 | mulid1 5344 |
. . . . . 6
⊢ (3 · 1) =
3 |
| 16 | | 3t2e6 6025 |
. . . . . 6
⊢ (3 · 2) =
6 |
| 17 | 15, 16 | opreq12i 3979 |
. . . . 5
⊢ ((3 · 1) / (3
· 2)) = (3 / 6) |
| 18 | 7, 14, 17 | 3eqtr3 1506 |
. . . 4
⊢ (1 / 2) = (3 /
6) |
| 19 | 18 | opreq1i 3977 |
. . 3
⊢ ((1 / 2) − (1 / 6))
= ((3 / 6) − (1 / 6)) |
| 20 | | 6re 5986 |
. . . . 5
⊢ 6 ∈ ℝ |
| 21 | 20 | recn 5326 |
. . . 4
⊢ 6 ∈ ℂ |
| 22 | | 6pos 5996 |
. . . . . 6
⊢ 0 < 6 |
| 23 | 20, 22 | gt0ne0i 5629 |
. . . . 5
⊢ 6 ≠ 0 |
| 24 | | divsubdirtOLD 5777 |
. . . . 5
⊢ (((3 ∈ ℂ ⋀ 1 ∈ ℂ ⋀ 6 ∈ ℂ) ⋀ 6 ≠ 0) → ((3 − 1) / 6) = ((3 / 6)
− (1 / 6))) |
| 25 | 23, 24 | mpan2 698 |
. . . 4
⊢ ((3 ∈ ℂ ⋀ 1 ∈ ℂ ⋀ 6 ∈ ℂ) → ((3
− 1) / 6) = ((3 / 6) − (1 / 6))) |
| 26 | 2, 3, 21, 25 | mp3an 918 |
. . 3
⊢ ((3 − 1) / 6) = ((3
/ 6) − (1 / 6)) |
| 27 | | df-3 5973 |
. . . . . . 7
⊢ 3 = (2 + 1) |
| 28 | 27 | opreq1i 3977 |
. . . . . 6
⊢ (3 − 1) = ((2 + 1)
− 1) |
| 29 | | pncant 5409 |
. . . . . . 7
⊢ ((2 ∈ ℂ ⋀ 1 ∈ ℂ) → ((2 + 1) − 1) = 2) |
| 30 | 4, 3, 29 | mp2an 699 |
. . . . . 6
⊢ ((2 + 1) − 1) =
2 |
| 31 | 28, 30 | eqtr 1498 |
. . . . 5
⊢ (3 − 1) =
2 |
| 32 | 31 | opreq1i 3977 |
. . . 4
⊢ ((3 − 1) / 6) = (2 /
6) |
| 33 | 4 | mulid2 5345 |
. . . . 5
⊢ (1 · 2) =
2 |
| 34 | 33, 16 | opreq12i 3979 |
. . . 4
⊢ ((1 · 2) / (3
· 2)) = (2 / 6) |
| 35 | 4, 6 | divid 5771 |
. . . . . 6
⊢ (2 / 2) = 1 |
| 36 | 35 | opreq2i 3978 |
. . . . 5
⊢ ((1 / 3) · (2 / 2))
= ((1 / 3) · 1) |
| 37 | 3, 2, 4, 4, 5, 6 | divmuldiv 5788 |
. . . . 5
⊢ ((1 / 3) · (2 / 2))
= ((1 · 2) / (3 · 2)) |
| 38 | 2, 5 | reccl 5725 |
. . . . . 6
⊢ (1 / 3) ∈ ℂ |
| 39 | 38 | mulid1 5344 |
. . . . 5
⊢ ((1 / 3) · 1) = (1
/ 3) |
| 40 | 36, 37, 39 | 3eqtr3 1506 |
. . . 4
⊢ ((1 · 2) / (3
· 2)) = (1 / 3) |
| 41 | 32, 34, 40 | 3eqtr2 1504 |
. . 3
⊢ ((3 − 1) / 6) = (1 /
3) |
| 42 | 19, 26, 41 | 3eqtr2 1504 |
. 2
⊢ ((1 / 2) − (1 / 6))
= (1 / 3) |
| 43 | 2, 3, 21, 23 | divdir 5754 |
. . . 4
⊢ ((3 + 1) / 6) = ((3 / 6) +
(1 / 6)) |
| 44 | | df-4 5974 |
. . . . 5
⊢ 4 = (3 + 1) |
| 45 | 44 | opreq1i 3977 |
. . . 4
⊢ (4 / 6) = ((3 + 1) /
6) |
| 46 | 18 | opreq1i 3977 |
. . . 4
⊢ ((1 / 2) + (1 / 6)) = ((3
/ 6) + (1 / 6)) |
| 47 | 43, 45, 46 | 3eqtr4r 1509 |
. . 3
⊢ ((1 / 2) + (1 / 6)) = (4 /
6) |
| 48 | | 2t2e4 6024 |
. . . 4
⊢ (2 · 2) =
4 |
| 49 | 48, 16 | opreq12i 3979 |
. . 3
⊢ ((2 · 2) / (3
· 2)) = (4 / 6) |
| 50 | 35 | opreq2i 3978 |
. . . 4
⊢ ((2 / 3) · (2 / 2))
= ((2 / 3) · 1) |
| 51 | 4, 2, 4, 4, 5, 6 | divmuldiv 5788 |
. . . 4
⊢ ((2 / 3) · (2 / 2))
= ((2 · 2) / (3 · 2)) |
| 52 | 4, 2, 5 | divcl 5722 |
. . . . 5
⊢ (2 / 3) ∈ ℂ |
| 53 | 52 | mulid1 5344 |
. . . 4
⊢ ((2 / 3) · 1) = (2
/ 3) |
| 54 | 50, 51, 53 | 3eqtr3 1506 |
. . 3
⊢ ((2 · 2) / (3
· 2)) = (2 / 3) |
| 55 | 47, 49, 54 | 3eqtr2 1504 |
. 2
⊢ ((1 / 2) + (1 / 6)) = (2 /
3) |
| 56 | 42, 55 | pm3.2i 285 |
1
⊢ (((1 / 2) − (1 / 6))
= (1 / 3) ⋀ ((1 / 2) + (1 / 6)) = (2 /
3)) |