Math. Nachr. 285, No. 14–15, 1675 – 1676 (2012) / DOI 10.1002/mana.201210500

Editorial

This special issue of Mathematische Nachrichten is devoted to Eduard R. Tsekanovskiı on the occasion of hisseventy-fifth birthday.

Eduard Tsekanovskiı was born on March 15, 1937 in Odessa, Ukraine, a lively port city on the Black Sea.After High School he entered the Odessa Pedagogical University and graduated with honor, receiving a degree inMathematics and Mathematics Education. He was taught by well-known mathematicians of Mark Krein’s school,among others, M. Brodskii, Yu. Ginzburg, A. Kuzhel, S. Orlov, V. Potapov, M. Rutman, and L. Sakhnovich.After an obligatory teaching assignment in a rural area he was accepted into the Mathematics Ph.D. program atthe Kharkov Institute of Radio Electronics (formerly the Mining Institute) under the supervision of M. Livsic,someone he affectionately considers his teacher for life. Eduard graduated from this program receiving his Ph.D.(1964) and Doctor of Science Degree (1970) in Physics and Mathematics at the celebrated Low TemperatureInstitute of the Ukrainian Academy of Sciences in Kharkov, and later he also received a Doctor of ScienceDegree in Physics and Mathematics at the Institute of Mathematics of the Ukrainian Academy of Sciences inKiev. The impressive list of referees for his dissertations includes, for instance, Yu. Berezansky, I. Glazman, A.Kostuchenko, M. Krein, A. Kuzhel, M. Livsic, V. Matsaev, and A. Strauss.

In 1965, Eduard began his academic career at the newly established Donetsk University, serving as the super-visor of ten Ph.D. students, many of which became internationally recognized mathematicians.

After the collapse of the Soviet Union, Eduard left Donetsk University and immigrated to the United Sates. In1992, after very humbling and trying times early on in the States, Eduard started a new career on a visiting and thena part-time Professorship at the State University of New York at Buffalo, and spent 1996–98 as a visiting Professor

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at the University of Missouri, Columbia. In 1998, Eduard joined Niagara University, his current affiliation, onceagain rising through the ranks until becoming Full Professor in 2006.

In the typical tradition of the former Soviet Union, Eduard has broad fields of research interests, rangingfrom Complex and Functional Analysis, Operator Theory, Stochastic Processes, Differential Operators, to Sys-tem Theory and Spectral Theory. He published well over 100 refereed articles in internationally acknowledgedjournals, and produced lecture notes on Operator Theory (jointly with Yu. Shmulyan) for his students at Donetsk.Most recently, in 2011, he published a book on “Conservative Realizations of Herglotz–Nevanlinna Functions”,jointly with Yu. Arlinskiı and S. Belyi, in the well-known Birkhauser series on Operator Theory: Advances andApplications, underscoring his outstanding reputation as an analyst.

However, we would fail in our attempt to honor Eduard’s wide range of achievements over the years if wewould not also emphasize his beaming and yet so charming personality, his extraordinary sense of humor, hishumility, and his unique capacity for long lasting friendships which reach out to so many corners of this globe.

The contributions to this special issue in Eduard’s honor reflect his many scientific interests and hence aredevoted to Complex and Functional Analysis, with special emphasis on Operator Theory and its Applications.

We sincerely thank all authors for their contributions.

Fritz GesztesyHeinz LangerMark MalamudReinhard Mennicken

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