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On an ODE Relevant for the General Theory of the Hyperbolic Cauchy Problem

Bernardi, Enrico, Bove, Antonio (2008)

Serdica Mathematical Journal

2000 Mathematics Subject Classification: 34E20, 35L80, 35L15.In this paper we study an ODE in the complex plane. This is a key step in the search of new necessary conditions for the well posedness of the Cauchy Problem for hyperbolic operators with double characteristics.

On measure solutions to the Zero-pressure gas model and their uniqueness

Jiequan Li, Gerald G. Warnecke (2002)

Mathematica Bohemica

The system of zero-pressure gas dynamics conservation laws describes the dynamics of free particles sticking under collision while mass and momentum are conserved. The existence of such solutions was established some time ago. Here we report a uniqueness result that uses the Oleinik entropy condition and a cohesion condition. Both of these conditions are automatically satisfied by solutions obtained in previous existence results. Important tools in the proof of uniqueness are regularizations, generalized...

On the existence of solutions for some nondegenerate nonlinear wave equations of Kirchhoff type

Jong Yeoul Park, Jeong Ja Bae (2002)

Czechoslovak Mathematical Journal

Let Ω be a bounded domain in n with a smooth boundary Γ . In this work we study the existence of solutions for the following boundary value problem: 2 y t 2 - M Ω | y | 2 d x Δ y - t Δ y = f ( y ) in Q = Ω × ( 0 , ) , . 1 y = 0 in Σ 1 = Γ 1 × ( 0 , ) , M Ω | y | 2 d x y ν + t y ν = g in Σ 0 = Γ 0 × ( 0 , ) , y ( 0 ) = y 0 , y t ( 0 ) = y 1 in Ω , ( 1 ) where M is a C 1 -function such that M ( λ ) λ 0 > 0 for every λ 0 and f ( y ) = | y | α y for α 0 .

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