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For the nonlinear heat equation with a fractional Laplacian ut + (−∆) α/2 u = u, 1 < α ≤ 2, the first initial-boundary value problem in a disk is considered. Small initial conditions, homogeneous boundary conditions, and periodicity conditions in the angular coordinate are imposed. Existence and uniqueness of a global-in-time solution is proved, and the solution is constructed in the form of a series of eigenfunctions of the Laplace operator in the disk. First-order long-time asymptotics of the solution is obtained.

Nonlinear Heat Equation with a Fractional Laplacian in a Disk