**Problem of the Week**

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seminars:comb:s99

**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)

seminars/comb/s99.txt · Last modified: 2020/01/29 14:03 (external edit)

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