====== The Combinatorics Seminar ======

[[index.html|Current Semester and Home Page]]

[[http://www.anybrowser.org/campaign/%22|Best Viewed With Any Browser]]

===== SPRING 1999 =====

**Tuesday, February 2** //(3:00 in LN-2298, joint with [[../AlgebraSem/|Algebra Seminar]])//\\
//Speaker//: Matthias Beck (Temple Univ.)\\
//Title//: [[abstract.19990202|Counting lattice points by means of the residue theorem. I: Basic ideas]]

**Tuesday, February 9** //(3:00 in LN-2298, joint with [[../AlgebraSem/|Algebra Seminar]])//\\
//Speaker//: Matthias Beck (Temple Univ.)\\
//Title//: [[abstract.19990202|Counting lattice points by means of the residue theorem. II: Rational polytopes]]

**Tuesday, March 30** //(3:00 in LN-2298, joint with [[../AlgebraSem/|Algebra Seminar]])//\\
//Speaker//: Jim Belk (Binghamton Univ.)\\
//Title//: Switching of graphs with skew gains (a paper of Hage and Harju)

April is the coolest month for combinatorics: take a look.

**Thursday, April 8**\\
//Speaker//: Richard P. Stanley (MIT)\\
//Seminar talk (2:50 in LN-2298, joint with [[../topsem/|Geometry/Topology Seminar]])//: [[abstract.19990408|Volumes, mixed volumes, and lattice point enumerators of convex polytopes]]\\
//Colloquium talk (4:30 in SW-323)//: Characteristic polynomials of hyperplane arrangements

**Thursday, April 15**\\
//Speaker//: Mark Watkins (Syracuse)\\
//Colloquium talk (4:30 in SW-323)//: [[abstract.19990415|Edge-transitive maps on orientable surfaces]]

**Tuesday, April 20** //(3:00 in LN-2298, joint with [[../AlgebraSem/|Algebra Seminar]])//\\
//Speaker//: Jim Belk (Binghamton Univ.)\\
//Title//: Switching of graphs with skew gains (a paper of Hage and Harju). II

**Thursday, April 22**\\
//Speaker//: Neil Robertson (Ohio State)\\
//Seminar talk (2:50 in LN-2298, joint with [[../topsem/|Geometry/Topology Seminar]])//: [[abstract.19990422sem|Flexibility of polyhedral embeddings of graphs on a surface]]\\
//Colloquium talk (4:30 in SW-323)//: [[abstract.19990422coll|The 4-colour theorem]]

**Friday, April 23**\\
//Speaker//: Neil Robertson (Ohio State)\\
//Graph theory talk (1:10 in SW-305)//: [[abstract.19990423|Minor relations for directed graphs]] (an elementary talk)


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[[http://www.math.binghamton.edu/|Departmental home page]].


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