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SUMMARY:François Nicoleau (Univ. de Nantes)
DTSTART:20250502T150000Z
DTEND:20250502T161500Z
DTSTAMP:20260423T021448Z
UID:CIRGET/140
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/CIRGET/140/"
 >Global counterexamples to uniqueness  for a Calder\\'on problem with smo
 oth conductivities.</a>\nby François Nicoleau (Univ. de Nantes) as part o
 f CRM - Séminaire du CIRGET / Géométrie et Topologie\n\nLecture held in
  PK-5115.\n\nAbstract\nLet  $\\Omega \\subset \\R^n$\, $n \\geq 3$\, be a 
 fixed smooth bounded domain\, and let $\\gamma$ be a smooth conductivity i
 n $\\overline{\\Omega}$. Consider a non-zero frequency\n$\\lambda_0$ which
  does not belong to the Dirichlet spectrum of $L_\\gamma = -{\\rm div} (\\
 gamma \\nabla \\cdot)$. Then\, there exists an infinite number of pairs of
  smooth non-isometric conductivities $(\\gamma_1\, \\gamma_2)$ on $\\overl
 ine{\\Omega}$\, which are close to $\\gamma$  and such that the associated
  DN maps at frequency $\\lambda_0$  are identical.\n\nThis is a joint work
  with Thierry Daudé\, Bernard Helffer and Niky Kamran.\n
LOCATION:https://researchseminars.org/talk/CIRGET/140/
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