Electronic Journal of Differential Equations, Vol. 2010(2010), No. 90, pp. 1-32. Title: Initial-boundary value problems in a plane corner for the heat equation Authors: Borys V. Bazaliy (NAS, Donetsk, Ukraine) Nataliya Vasylyeva (NAS, Donetsk, Ukraine) Abstract: We study the Dirichlet initial problem for the heat equation by the Fourier-Bessel method in a plane corner. We prove classical solvability for the problem in weighted Holder spaces. Submitted September 11, 2009. Published June 30, 2010. Math Subject Classifications: 35K20, 35K365. Key Words: Initial boundary value problems; nonsmooth domains; weighted Holder spaces; trigonometric series.