Detailed syntax breakdown of Definition df-bj-invc
Step | Hyp | Ref
| Expression |
1 | | cinvc 33134 |
. 2
class
-1ℂ̅ |
2 | | vx |
. . 3
setvar 𝑥 |
3 | | cccbar 33102 |
. . . 4
class
ℂ̅ |
4 | | ccchat 33119 |
. . . 4
class
ℂ̂ |
5 | 3, 4 | cun 3572 |
. . 3
class
(ℂ̅ ∪ ℂ̂) |
6 | 2 | cv 1482 |
. . . . 5
class 𝑥 |
7 | | cc0 9936 |
. . . . 5
class
0 |
8 | 6, 7 | wceq 1483 |
. . . 4
wff 𝑥 = 0 |
9 | | cinfty 33117 |
. . . 4
class
∞ |
10 | | cc 9934 |
. . . . . 6
class
ℂ |
11 | 6, 10 | wcel 1990 |
. . . . 5
wff 𝑥 ∈ ℂ |
12 | | c1 9937 |
. . . . . 6
class
1 |
13 | | cdiv 10684 |
. . . . . 6
class
/ |
14 | 12, 6, 13 | co 6650 |
. . . . 5
class (1 /
𝑥) |
15 | 11, 14, 7 | cif 4086 |
. . . 4
class if(𝑥 ∈ ℂ, (1 / 𝑥), 0) |
16 | 8, 9, 15 | cif 4086 |
. . 3
class if(𝑥 = 0, ∞, if(𝑥 ∈ ℂ, (1 / 𝑥), 0)) |
17 | 2, 5, 16 | cmpt 4729 |
. 2
class (𝑥 ∈ (ℂ̅ ∪
ℂ̂) ↦ if(𝑥 = 0, ∞, if(𝑥 ∈ ℂ, (1 / 𝑥), 0))) |
18 | 1, 17 | wceq 1483 |
1
wff
-1ℂ̅ = (𝑥 ∈ (ℂ̅ ∪ ℂ̂)
↦ if(𝑥 = 0, ∞,
if(𝑥 ∈ ℂ, (1 /
𝑥), 0))) |