Regina Tyshkevich

Regina Iosifovna Tyshkevich was a Belarusian mathematician, an expert in graph theory, Doctor of Physical and Mathematical Sciences, professor of the Belarusian State University.
Her main scientific interests included Intersection graphs, degree sequences, and the reconstruction conjecture. She was also known for an independent introduction and investigation of the class of split graphs and for her contributions to line graphs of hypergraphs.
In 1998, she was awarded the for her book Lectures in Graph Theory. Of note is her textbook An Introduction into Mathematics, written together with her two colleagues.
In October 2009 an international conference "Discrete Mathematics, Algebra, and their Applications", sponsored by the Central European Initiative, was held in Minsk, Belarus in honor of her 80th anniversary.
Regina Tyshkevich was a direct descendant of the Tyszkiewicz
magnate family, therefore her colleagues sometimes called her "the countess of graph theory", which is a pun in the Russian language: the Russian word "граф" is a homonym for two words meaning "count" and "graph".

Books and selected publications

"Commutative Matrices", 1968, Academic Press
*Russian original: "Perestanovochnye matritsy" 1966, 2nd edition: 2003,
"Lectures on Graph Theory", B. I. Wissenschaftsverlag, 1994
*Russian original: "Lektsii po teorii grafov", 1990
"Exercises in Graph Theory", Kluwer Academic Publishers, 1998,
"Linear Algebra and Analytical Geometry
Кононов С.Г., Тышкевич Р.И., Янчевский В.И. "Введение в математику" 3 volumes, Minsk, Belarusian State University, 2003
R.I. Tyshkevich. Decomposition of graphical sequences and unigraphs // Discrete Math., 2000, Vol. 220, p. 201 - 238.
Yury Metelsky, Regina Tyshkevich: Line Graphs of Helly Hypergraphs. SIAM Journal on Discrete Mathematics 16: 438-448