Point-counting over finite fields, degeneration, and juggling patterns |
Abstract:
The intersection of the the x-axis and the parabola y=x^2 is a
"nonreduced scheme", with two points sitting on top of one another at
the origin. In many geometric examples coming from representation theory,
this nonreducedness does not occur; for example, the intersection of
any two Schubert varieties is always reduced, despite this intersection
being very non-transverse. I will explain how reducedness questions
naturally lead one to consider characteristic p computations, and
prove the following: |
Web page: Alexandru I. Suciu | Comments to: alexsuciu@neu.edu | |
Posted: April 12, 2010 | URL: http://www.math.neu.edu/bhmn/knutson10.html |