An Initial Value Problem for all Hyperbolic Partial Differential Equations of Second Order with Three Independent Variables

Abstract

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On linear partial differential equations with analytic coefficients unique continuation of data

“…Sufficient, but not necessary, is obvioiwly analyticity of the data. T t has been shown by E. W. Titt [20] that analyticity of the data in some, but not all, of the variables may be sufficient. But again this condition cannot be necessary, as the example of the wave equation show.…”