Geodesic
Two-Dimensional von Neumann--Wigner Potentials with a Multiple Positive Eigenvalue
Funkcionalʹnyj analiz i ego priloženiâ, Tome 48 (2014) no. 4, pp. 74-77.

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By the Moutard transformation method we construct two-dimensional Schrödinger operators with real smooth potentials decaying at infinity and having a multiple positive eigenvalue. These potentials are rational functions of spatial variables and their sines and cosines.
Keywords: two-dimensional Schrödinger operator, positive eigenvalues.
Mots-clés : Moutard transformation 
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R. G. Novikov; I. A. Taimanov; S. P. Tsarev. Two-Dimensional von Neumann--Wigner Potentials with a Multiple Positive Eigenvalue. Funkcionalʹnyj analiz i ego priloženiâ, Tome 48 (2014) no. 4, pp. 74-77. http://geodesic.mathdoc.fr/item/FAA_2014_48_4_a7/

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