Optimum accelerating factor for s.o.r. solutions of domains containing ∂φ/∂ n = 0 boundary conditions

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Abstract
The letter describes a simple and useful extension of existing theory on the determination of optimum accelerating factor for successive over-relaxation applied to solutions of Laplace's and Poisson's equations. In particular, domains where the condition ∂φ/∂n = 0 is applied along part of the boundary contour are considered. The boundary along which this condition is applied need not be linear.