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One condition for discreteness of the spectrum and compactness of the resolvent of a nonsectorial Sturm-Liouville operator on a semiaxis. (English. Russian original) Zbl 07735232

Dokl. Math. 107, No. 2, 117-119 (2023); translation from Dokl. Ross. Akad. Nauk, Mat. Inform. Protsessy Upr. 510, 39-42 (2023).
MSC:  34Lxx 41Axx 33-XX
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Explicit solutions for geodetic problems on the deformed sphere as reference model for the geoid. (English) Zbl 07725731

Mladenov, Ivaïlo M. (ed.), Geometry, integrability and quantization. Volume 25. Sofia: Bulgarian Academy of Sciences, Institute for Nuclear Research and Nuclear Energy. Geom. Integrability Quantization 25, 73-94 (2023).
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