Abstract
Several recent achievements of Sergey Naboko in spectral theory of singular differential operators and metric graphs are described. The impact of Sergey’s work on my own research career is underlined.
To the memory of Sergey, my older friend who taught me math and life, whom I miss more every day
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Kurasov, P. (2023). On Crossroads of Spectral Theory with Sergey Naboko. In: Brown, M., et al. From Complex Analysis to Operator Theory: A Panorama. Operator Theory: Advances and Applications, vol 291. Birkhäuser, Cham. https://doi.org/10.1007/978-3-031-31139-0_4
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