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A boundary value problem for quasilinear hyperbolic systems with a retarded argument. (English) Zbl 0658.35085
Consider the boundary value problem for systems of quasilinear hyperbolic differential equations with retarded argument: $(1)\quad \sum A_{ij}(x,y,z(x,y))[D_ xz_ j(x,y)+\sum^{m}_{k=1}\ell_{ik}(x,y,z(x,y),(z\circ \alpha)+(x,y)D_{yk}z_ j(x,y)]=$ $=f_ i(x,y,z(x,y),z\circ \beta)(x,y)),$ i$$=1,2,...,n$$, $$(x,y)\in D_{\alpha}$$, $$y=(y_ 1,...,y_ m)\in R^ m$$, $$m\geq 1$$, $$(z\circ \alpha)(x,y)=z(\alpha (x,y))$$. P. Bassanini [Boll. Unione Mat. Ital., VI. Ser. B 1, 225- 250 (1982; Zbl 0488.35056)] studied the system (1). Basing on this work, a theorem of existence, uniqueness and continuous dependence on boundary data is proved for a.e. solutions of problem (1).
Reviewer: J.H.Tian

MSC:
 35R10 Functional partial differential equations 35L70 Second-order nonlinear hyperbolic equations 35A05 General existence and uniqueness theorems (PDE) (MSC2000)
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