Inhomogeneous Wirtinger equation with holomorphic forcing
ID: inhomogeneous-wirtinger-equation-with-holomorphic-forcing
Let be a holomorphic function on an open set . Among continuously differentiable functions, all solutions of arewhere is an arbitrary holomorphic function on . The Wirtinger derivatives satisfy and , so the product rule verifies the particular solution . Subtracting it from any other solution leaves a continuously differentiable function with vanishing Wirtinger derivative, hence a holomorphic function by the Cauchy-Riemann equations. Conversely adding such a holomorphic function changes no prescribed derivative. For on the complex plane, the solutions are with any entire function.
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