Metamath Proof Explorer


Theorem imcld

Description: The imaginary part of a complex number is real (closure law). (Contributed by Mario Carneiro, 29-May-2016)

Ref Expression
Hypothesis recld.1 ( 𝜑𝐴 ∈ ℂ )
Assertion imcld ( 𝜑 → ( ℑ ‘ 𝐴 ) ∈ ℝ )

Proof

Step Hyp Ref Expression
1 recld.1 ( 𝜑𝐴 ∈ ℂ )
2 imcl ( 𝐴 ∈ ℂ → ( ℑ ‘ 𝐴 ) ∈ ℝ )
3 1 2 syl ( 𝜑 → ( ℑ ‘ 𝐴 ) ∈ ℝ )