Oscillations of Anharmonic Fourier Series and The Wave Equation.

• Autores: Alain Haraux , Vilmos Komornik
• Localización: Revista matemática iberoamericana, ISSN 0213-2230, Vol. 1, Nº 4, 1985, págs. 57-77
• Idioma: inglés
• DOI: 10.4171/rmi/18
• Títulos paralelos:
  • Oscilaciones de series de Fourier anarmónicas y la ecuación de onda.
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• Resumen

  • In this paper we have collected some partial results on the sign of u(t,x) where u is a (sufficiently regular) solution of ì utt + (-1)m ?mu = 0 (t,x) Î R x O í î u|G = ... = ?m-1 u|G = 0 t Î R.

    These results rely on the study of a sign of almost periodic functions of a special form restricted to a bounded interval J.