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zbMath0638.35055MaRDI QIDQ3779116

Norio Yoshida

Publication date: 1987

Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.

zbMATH Keywords

oscillation non-existence zero characteristic initial value problem poitive solutions quadrangular domains

Mathematics Subject Classification ID

Initial-boundary value problems for second-order hyperbolic equations (35L20) Oscillation, zeros of solutions, mean value theorems, etc. in context of PDEs (35B05) Second-order nonlinear hyperbolic equations (35L70)

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