ILE Home Intuitionistic Logic Explorer < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  ILE Home  >  Th. List  >  df-im GIF version

Definition df-im 9444
Description: Define a function whose value is the imaginary part of a complex number. See imval 9450 for its value, imcli 9512 for its closure, and replim 9459 for its use in decomposing a complex number. (Contributed by NM, 9-May-1999.)
Assertion
Ref Expression
df-im ℑ = (𝑥 ∈ ℂ ↦ (ℜ‘(𝑥 / i)))

Detailed syntax breakdown of Definition df-im
StepHypRef Expression
1 cim 9441 . 2 class
2 vx . . 3 setvar 𝑥
3 cc 6887 . . 3 class
42cv 1242 . . . . 5 class 𝑥
5 ci 6891 . . . . 5 class i
6 cdiv 7651 . . . . 5 class /
74, 5, 6co 5512 . . . 4 class (𝑥 / i)
8 cre 9440 . . . 4 class
97, 8cfv 4902 . . 3 class (ℜ‘(𝑥 / i))
102, 3, 9cmpt 3818 . 2 class (𝑥 ∈ ℂ ↦ (ℜ‘(𝑥 / i)))
111, 10wceq 1243 1 wff ℑ = (𝑥 ∈ ℂ ↦ (ℜ‘(𝑥 / i)))
Colors of variables: wff set class
This definition is referenced by:  imval  9450  imf  9456
  Copyright terms: Public domain W3C validator