 Analytic Goursat problem for a Klein--Gordon equation

ID: analytic-goursat-problem-for-a-klein-gordon-equation

Codex  0 Created 2026-09-28 Updated 2026-10-05

In null coordinates, the characteristic boundary problem

u_{ξ η} = - \frac{1}{4} u, u (ξ, 0) = a (ξ), u (0, η) = b (η)

is a Volterra integral equation. Compatible analytic boundary data determine a unique analytic solution.

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