Abstract
Under an additional symmetry condition, we prove that the spectrum of a second order self-adjoint elliptic differential operator with periodic coefficients is purely absolutely continuous.
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Received: 19 December 2001 / Accepted: 10 January 2002¶Published online: 24 July 2002
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Friedlander, L. On the Spectrum of a Class of Second Order Periodic Elliptic Differential Operators. Commun. Math. Phys. 229, 49–55 (2002). https://doi.org/10.1007/s00220-002-0675-6
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DOI: https://doi.org/10.1007/s00220-002-0675-6