#
The Combinatorics Seminar

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** Tuesday, February 2 ***(3:00 in LN-2298, joint with **Algebra Seminar)*

* Speaker*: Matthias Beck (Temple Univ.)

* Title*: Counting lattice points by means of the residue theorem. I: Basic ideas
** Tuesday, February 9 ***(3:00 in LN-2298, joint with Algebra Seminar)*

* Speaker*: Matthias Beck (Temple Univ.)

* Title*: Counting lattice points by means of the residue theorem. II: Rational polytopes
** Tuesday, March 30 ***(3:00 in LN-2298, joint with 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 Geometry/Topology Seminar)*: 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)*: Edge-transitive maps on orientable surfaces
** Tuesday, April 20 ***(3:00 in LN-2298, joint with 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 Geometry/Topology Seminar)*: Flexibility of polyhedral embeddings of graphs on a surface

* Colloquium talk (4:30 in SW-323)*: The 4-colour theorem
** Friday, April 23 **

* Speaker*: Neil Robertson (Ohio State)

* Graph theory talk (1:10 in SW-305)*: Minor relations for directed graphs (an elementary talk)

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