Hi, I am Associate Professor in the Department of Mathematical Sciences at University of Delaware in Newark,Delaware. I am interested in graph theory and combinatorics and their applications to other areas of mathematics and science. You can find our more about my work here

We have an active Discrete Mathematics group and we have a weekly Discrete Math Seminar.  If you would like attend or talk, please let us know.

I enjoy working with undergraduate and graduate students. If you are a student who likes math, please drop by my office or send me an email. I am supervising 3.5 Ph.D.students: Peng Xu (with Mokshay Madiman), Matt McGinnis and
Lorinda Leshock and Yingnan Zhang

Weiqiang (Ricky) Li was my 3rd Ph.D. student between 2011 and 2015. He defended his Ph.D. Thesis Algebraic methods in graph theory on May 18. 2015 and is now working for Google

Jason Vermette was my 2nd Ph.D. student between 2011 and 2015. He defended his Ph.D. Thesis Spectral and combinatorial properties of friendship graphs, simplicial rook graphs and extremal expanders on April 23, 2015 and is a Tenure-Track Assistant Professor at Missouri Baptist University since Fall 2015.

Wiseley Wong was my 1st Ph.D. student between 2010 and 2013. He defended his Ph.D. Thesis Spanning trees, toughness and eigenvalues of graphs on March 12, 2013 and is a Lecturer at the University of Maryland.

Michael Tait was my first M.Sc. student between 2010 and 2011. He defended his M.Sc. Thesis The Alon-Saks-Seymour and Rank-Coloring Conjectures on April 20, 2011, finished his Ph.D. in 2016 at the University of California at San Diego with Jacques Verstraete   and will be an NSF postdoc at Carnegie Mellon from Fall 2016.

I have also supervised the summer research of some bright undergraduate students: Michael Tait, Patrick Devlin, Dajun Lin, Michelle Markiewitz and Alexandra Sampugnaro, Emma Kulek, Yi Zhang and Briana Lamet.
See some of our work

I was an NSERC Postdoctoral Fellow at University of Toronto  (June-December 2008, my mentor was Mike Molloy) and at University of California at San Diego (February 2006-June 2008, my mentor was Fan Chung). I had obtained a Ph.D. in Math at Queen's University at Kingston, Canada in 2006, a M.Sc. in Math at Queen's in 2002 and a B.Sc. in Math/Computer Science at University of Bucharest, Romania in 2000. My Ph.D. advisors were: David Gregory, Ram Murty, David Wehlau. My M.Sc. advisor was Dom de Caen and my B.Sc. advisor was Ioan Tomescu.

At Queen's, I used to play soccer with the famous (at least on a 1/4 mile radius around Queen's campus) Mel's Angels. It must have been because of our great shirts. Corey Willman found it amusing to write this about my soccer skills.

"There is no problem
in all mathematics
that cannot be solved
by direct counting."

Ernst Mach

address:  Sebastian (Sebi) Cioaba
University of Delaware,
Department of Mathematical Sciences
Ewing Hall, Room 506

Office phone: (302) 831 1866
Newark  DE 19716-2553
cioaba at udel dot edu

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