The 23rd Bay Area Discrete Math Day (BADMath Day) will take place at UC Davis on Saturday, October 15, 2011 from 9AM until 5PM. The event will take place in the Mathematical Sciences Building, room 1147.

### Registration

Registration is now Closed. As usual, BAD Math Day is a free event, so you can still attend.

Lunch will be provided on-site, but only if you registered. There will also be a dinner following the event, heavily subsidized by D.E. Shaw and the Davis Math department. Everyone is welcome to attend. Both will be vegetarian and vegan friendly.

Email questions to Andrew Berget using (my last name)@math.ucdavis.edu.

### Speakers and schedule

- 9:00-10:00 am, Registration
- 10:00-10:30
am, Amitabh Basu
UC Davis.

A*k*+1 slope theorem for the Infinite Group Problem - 10:45-11:15 am, Felix
Breuer San Francisco State University.

Using Ehrhart theory for solving combinatorial problems - 11:30-12:30 pm, Svante
Linusson KTH

The probability of the Alabama paradox - 12:30-2:00 pm, Lunch (
*please register!*) - 2:00-2:30
pm, Nathan
Ilten UC Berkeley

Calculating T-Ideals - 2:45-3:15 pm, Kate
Poirier UC Berkeley

String topology - 3:15-4:00 pm, Coffee and tea
- 4:00-5:00 pm, Assaf Naor, Courant
Institute, NYU/MSRI

The Grothendieck constant is strictly smaller than Krivine's bound

Walking and driving directions to dinner will be provided on site.

### Transportation and parking

UC Davis is easily accessible from all over the Bay Area; it is just off Interstate Highway 80, about 20 miles west of Sacramento. Contact your local organizer to arrange car pools. There is a $5 cash toll on Interstate 80 heading to Davis. There is a cash toll returning to San Francisco or Marin County (but most other places in the East Bay are free).

The closest parking lot to the Mathematical Sciences Building is Parking Lot 46. Here's a Google Map with directions to this lot, which is Item B. Item C is the Mathematical Sciences Building, where BAD Math Day will be held. All places marked P on the map have parking, which is free on the weekends.

You can ride Amtrak's Capital Corridor from the Bay Area to Davis. Here is a link to a schedule. From the station it is a 20/30 minute walk to the event. You can board the train in several Bay Area locations, in parituclar at the Richmond BART station. You might consider bringing your bike on the train, since this cuts the walking time down by at least 1/3.

### About BAD Math

BADMath Days are one-day meetings aimed at facilitating communication between researchers and graduate students of discrete mathematics around the San Francisco Bay Area. These days happen twice a year and strive to create an informal atmosphere to talk about discrete mathematics.

The term "discrete mathematics" is chosen to include at least the following topics: Algebraic and Enumerative Combinatorics, Discrete Geometry, Graph Theory, Coding and Design Theory, Combinatorial Aspects of Computational Algebra and Geometry, Combinatorial Optimization, Probabilistic Combinatorics, Combinatorial Aspects of Statistics, and Combinatorics in Mathematical Physics.

The organizing committee consists of Federico Ardila (SFSU), Andrew Berget (UCD), Tim Hsu (SJSU), Carol Meyers (Lawrence Livermore National Lab), Kelli Talaska (UCB), Rick Scott (Santa Clara U.), Ellen Veomett (Saint Mary's College of California).

Support for BAD Math Day is provided by the UC Davis Department of Mathematics and