UCSD Number Theory Seminar (Math 209)

Thursday 2-3pm, AP&M 7421

This quarter, most talks will be preceded by a 30-minute "prep talk" for graduate students and postdocs. These will be in AP&M 7421 starting at 1:15pm.
Don't forget to register for Math 209 if you are a graduate student. As of this quarter, we are eligible for department funding as long as we maintain sufficient enrollment.

Fall Quarter 2016

For previous quarters' schedule, click here.

September 22

NO SEMINAR (organizational meeting)

September 29


October 6

NO SEMINAR (preempted by RTG colloquium)

October 13

Benedict Gross (UCSD)
On Hecke's decomposition of the regular differentials on the modular curve of level p (part II)

This is the continuation of last week's RTG colloquium lecture.

October 20


October 27
(plus prep talk)

Jinhyun Park (KAIST)
Algebraic cycles and crystalline cohomology

In the theory of "motives", algebraic cycles are central objects. For instance, the so-called "motivic cohomology", that give the universal bigraded ordinary cohomology on smooth varieties, are obtained from a complex of abelian groups consisting of certain algebraic cycles. In this talk, we discuss how one can go beyond it, and we show that an infinitesimal version of the above complex of abelian groups of algebraic cycles can be identified with the big de Rham-Witt complexes after a suitable Zariski sheafification. This in a sense implies that the crystalline cohomology theory admits a description in terms of algebraic cycles, going back to a result of S. Bloch and L. Illusie in the 1970s. This is based on a joint work with Amalendu Krishna.

November 3
(plus prep talk?)


November 10
(plus prep talk?)


November 17
(plus prep talk?)

Rufei Ren (UC Irvine)

November 24

NO SEMINAR (Thanksgiving)

December 1
(plus prep talk?)

Vlad Matei (Wisconsin)