Titlebook: Hyperbolic Equations and Waves; Battelle Seattle 196 M. Froissart Book 1970 Springer-Verlag Berlin Heidelberg 1970 Battelle Seattle 1968 Re

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,On Feynman’s Integrals,The following result confirms an hypothesis made in theoretical physics (see J. . and . [2]), whose main part was recently proved by D. . [1], (namely the existence of the algebraic singular support).

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The Theory of Lacunas,This is a report on joint work with M. F. . and R. .. Our aim is to analyze and generalize an article by I. G. . [1].

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A Difference Method for Plane Problems in Dynamic Viscoplasticity,The equations governing the small dynamic deformations of an isotropic elastic/viscoplastic solid under condition of plane strain can be written in the following form:

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Maximum Norm Stability for Parabolic Difference Schemes in Half-Space,Consider a partial differential operator of order 2m:

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Stability and Well-Posedness for Difference Schemes and Partial Differential Equations for Time DepThis result is due to H.-O.. and was first presented at a meeting on these problems at the University of Denver. The method of proof involves transform techniques.

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On the General Theory of Mixed Problems,We start with a simple example. Consider the wave equation in a half-plane,

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Group Velocity,This paper gives a survey of the theory of group velocity for one-dimensional and three- dimensional, isotropic and anisotropic, homogeneous and inhomogeneous, conservative and dissipative, linear and non-linear, classical and relativistic systems exhibiting wave propagation under free and forced-motion conditions.

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