let f : ℝ → ℂ := fun t ↦ w * t + 2 * (1 - t)
case neg
w : ℂ
hw : ¬w = 1 ∧ 0 < w.re
w_im : ¬w.im = 0
⊢ JoinedIn {z | z ≠ 1 ∧ 0 < z.re} 2 w
case neg
w : ℂ
hw : ¬w = 1 ∧ 0 < w.re
w_im : ¬w.im = 0
f : ℝ → ℂ := fun t => w * ↑t + 2 * (1 - ↑t)
⊢ JoinedIn {z | z ≠ 1 ∧ 0 < z.re} 2 w