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Lutz Volkmann Lutz Volkmann (born 1944) is an emeritus professor of mathematics at RWTH Aachen University, Germany, who has worked in various areas of mathematics. Volkmann is the author of about 430 publications (with more than 100 different co-authors) in functions of a complex variable and combinatorics - more specifically in graph theory. His publications include various books, such as``Meromorphe Funktionen und Differentialgleichungen [1] in 1985 (co-authored by Gerhard Jank) and ``Graphen an allen Ecken und Kanten [2] in 2011 (in German). In addition, he has written five survey papers on factor theory [3], multipartite tournaments [4,7], conectivity [8] as well as domination and independence [9]. He is co-author, with Paul Butzer, of a biographie of Otto Blumenthal [6], published in 2006. He is the namesake of „Volkmann trees''. For many molecular structure descriptors the Volkmann tree V(n,d) is extremal among n-vertex trees in which no vertex has degree greater than d (see [5, 11, 12, 13]). Lutz Volkmann supervised 15 doctoral theses, and six of his students pursued academic careers (The Mathematics Genealogy Project - Lutz Volkmann). https://www.genealogy.math.ndsu.nodak.edu/id.php?id=21106 In January 2004, a colloquium was held at the University of Aachen on the occasion of Volkmann's 60th birthday [10]. Volkmann is also a sportsman, in 2014 he ran a half marathon in 2 hours and 6 minutes. In 2015, he celebrated his golden wedding together with his wife Hannelore. They have two daughters, Andrea and Kira. SELECTED WORKS Books 1.	G. Jank and L. Volkmann, Einführung in die Theorie der ganzen und meromorphen Funktionen mit Anwendungen auf Differentialgleichungen. UTB-Grosse Reihe. Birkhäuser Verlag, Basel - Boston - Stuttgart 1985, 256 pp. 2.	L. Volkmann, Graphen an allen Ecken und Kanten. Second version: https://www.math2.rwth-aachen.de/files/gt/buch/graphen_an_allen_ecken_und_kanten.pdf RWTH Aachen 2011, XVII, 385 pp. Articles 3.	L. Volkmann, Regular graphs, regular factors, and the impact of Petersen's theorems. Jahresber. Deutsch. Math.-Verein. 97 (1995), 19-42.

4.	L. Volkmann, Cycles in multipartite tournaments: results and problems. Discrete Math. 245 (2002), 19-53. 5.	M. Fischermann, A. Hoffmann, D. Rautenbach, L.A. Székely and L. Volkmann, Wiener index versus maximum degrees in trees. Discrete Appl. Math. 122 (2002), 127-137.

6.	P. Butzer and L. Volkmann, Otto Blumenthal (1876-1944) in retrospect. J. Approx. Theory 138 (2006), 1-36.

7.	L. Volkmann, Multipartite tournaments: a survey. Discrete Math. 307 (2007), 3097-3129. 8.	A. Hellwig and L. Volkmann, Maximally edge-connected and vertex-connected graphs and digraphs: a survey. Discrete Math. 308 (2008), 3265-3296.

9.	M. Chellali, O. Favaron, A. Hansberg and L. Volkmann, k-domination and k-independence in graphs: A survey. Graphs Combin. 28 (2012), 1-55.

References

10.	Erster Aachener Tag der Graphentheorie. [First Aachen day of graph theory] On the occasion of the 60th birthday of Professor Dr. Lutz Volkmann. Papers from the meeting held at RWTH Aachen University, Aachen, January 9, 2004. Edited by Miranca Fischermann, Yubao Guo, Angelika Hellwig, Arne Hoffmann, Dirk Meierling, Bert Randerath, Dieter Rautenbach, Meike Tewes and Stefan Winzen. Rheinisch-Westfälische Technische Hochschule, Lehrstuhl II für Mathematik, Aachen, 2004, iv, 145 pp.

11.	Ivan Gutman, Boris Furtula, Violeta Marković and Biljana Glišić, Alkanes with greates Estrada index. Z. Naturforsch. 62a (2007), 495-498.

12.	Wei Li, Xueliang Li and Ivan Gutman, Volkmann trees and their molecular structure descriptors. I. Gutman, B. Furtula (eds.), Novel Molecular Structure Descriptors - Theory and Applications II, Univ. Kragujevac, Kragujevac, 2010, pp. 231-246.

13.	Yabing Kuang and Fangli Xia, Molecular structure descriptors for Volkmann trees. Appl. Math. Sci. 5 (2011), 2033-2038.