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| Description: Define the complex (imaginary) number i. |
| Ref | Expression |
|---|---|
| df-i |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ci 4030 |
. 2
| |
| 2 | c0r 3788 |
. . 3
| |
| 3 | c1r 3789 |
. . 3
| |
| 4 | 2, 3 | cop 1810 |
. 2
|
| 5 | 1, 4 | wceq 1091 |
1
|
| Colors of variables: wff set class |
| This definition is referenced by: axicn 4065 axi2m1 4082 axcnre 4087 |