Winter 2017 learning seminar on positroids

Positroids are very interesting objects with connections to combinatorics, geometry, and quantum field theory. Cameron Marcott and I will be running a learning seminar to get to know them better.

We will be in MC5479, 2:30-3:30 Mondays. Please join us if you are interested. See below for the schedule.

Note that starting January 16 the time is 2:30-3:30; half an hour later than originally scheduled.

Schedule

January 9 (time: 2-3): Cameron Marcott, combinatorial introduction to positroids. Notes
January 16: Karen Yeats, lots of bijections and different combinatorial ways to see positroids.
January 23: Cameron Marcott, geometric introduction to positroids.
January 30: Karen Yeats, enumeration of positroids
February 6: Ben Moore
February 13: Nick Olson-Harris
February 20: No seminar, spring break
February 27: Susama Agarwala (USNA)
March 6: Paolo Benincasa (Perimeter Institute)
March 13: No seminar so people can go to a PI talk.
March 20: Paolo Benincasa (Perimeter Insitute)
March 27: Cancelled
April 3: Kevin Purbhoo

References

Let us know what your favorite references are and we will add them.

Positroid notes by Thomas Lam
Scattering Amplitudes and the Positive Grassmannian, Nima Arkani-Hamed, Jacob L. Bourjaily, Freddy Cachazo, Alexander B. Goncharov, Alexander Postnikov, Jaroslav Trnka.
Positroids and non-crossing partitions Federico Ardila, Felipe Rincón, Lauren Williams.
Combinatorics of Positroids Suho Oh.
Enumeration of totally positive Grassmann cells, Lauren K. Williams.
Positroid Varieties: Juggling and Geometry, Allen Knutson, Thomas Lam, and David Speyer.

Previous learning seminars

Learning seminars from my time at Simon Fraser University. (I wonder how long these links will work.)

Spring 2013 seminar on complex analysis and combinatorics
Fall 2012 complex analysis and combinatorics part I
Fall 2011 multiple zeta values
Summer 2011 the Dynkin operator and renormalization Hopf algebras
Spring 2011 integrable models in combinatorics and physics
In Fall 2010, Samson Black and I organied a learning seminar on knots and quantum field theory.
In late April and May 2010 I gave a series of 5 lectures on Renormalization Hopf Algebras, and the participants kindly took notes.
Spring 2010 workgroup on Random matrices, symmetric functions, and graph enumeration.

Older seminars on more motivic topics from when I was at Boston University. There are many broken links, but I consider these archived and so they will not be changed.

Fall 2006 seminar on motives with applications in physics
Spring 2006 Motives-Arithmetic-Physics Seminar (organized by Obi Rej).
Fall 2005 learning seminar on motives