Essential Spectrum and Null Controllability of Some Parabolic Equations

  • Farid Ammar KhodjaEmail author
  • Cédric Dupaix
Part of the SEMA SIMAI Springer Series book series (SEMA SIMAI, volume 17)


We give some examples proving that if the underlying elliptic operator of a parabolic equation admits essential spectrum, then boundary or internal null controllability are not possible in general.


Controllability Degenerate parabolic equations Elliptic systems Essential spectrum Singular sequences 


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© Springer Nature Switzerland AG 2018

Authors and Affiliations

  1. 1.Laboratoire de Mathématiques de BesançonBesançon CedexFrance

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