Complex Analysis: Theory and Applications · Problem 6.3.12

Complex Integration — Howell & Matthews

Mathematics — Complex Analysis · cauchy-goursat-theorem

Problem

Suppose that f(z)=u(r,θ)+iv(r,θ)f(z) = u(r,\theta) + iv(r,\theta) is analytic for all values of z=reiθz = re^{i\theta}. Show that ∫02π[u(r,θ)cos⁡θ−v(r,θ)sin⁡θ]dθ=0.\int_0^{2\pi} \left[u(r,\theta)\cos\theta - v(r,\theta)\sin\theta\right]d\theta = 0. Hint: Integrate ff around the circle C1+(0)C_1^+(0).

Related theory

Browse the problem library