The Cauchy Problem for Hyperbolic Equations with Double Characteristics
Author(s) -
Nobuhisa Iwasaki
Publication year - 1983
Publication title -
publications of the research institute for mathematical sciences
Language(s) - English
Resource type - Journals
eISSN - 1663-4926
pISSN - 0034-5318
DOI - 10.2977/prims/1195182016
Subject(s) - mathematics , hyperbolic partial differential equation , cauchy problem , initial value problem , principal part , mathematical analysis , elliptic partial differential equation , algebraic number , well posed problem , hyperbolic manifold , partial differential equation , pure mathematics , hyperbolic function
In the last decade, the theory on the Cauchy problem for hyperbolic equations has developed a little in the analysis of their characters. This article will aim to survey briefly the main point of the advance. Before doing so, we give a short historical remark. The notion of hyperbolic equation began from the characterization of the wave equation. In the present day, however, it comes to be understood as an algebraic and geometric characterization, for symbols of partial differential operators, corresponding to solvability of non characteristic Cauchy problem for them with data of a suitable function space, so called "well posed". Especially it seems to have been considered that the solvability to the space of infinitely difYerentiable functions called
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