Lethbridge Number Theory and Combinatorics Seminar: Cristhian Garay

  • Date: 02/06/2023
  • Time: 11:00
Cristhian Garay, CIMAT

University of Lethbridge


Generalized valuations and idempotization of schemes [video]


Classical valuation theory has proved to be a valuable tool in number theory, algebraic geometry and singularity theory. For example, one can enrich spectra of rings with new points coming from valuations defined on them and taking values in
totally ordered abelian groups. Totally ordered groups are examples of idempotent semirings, and generalized valuations appear when we replace totally ordered abelian groups with more general idempotent semirings. An important example of idempotent semiring is the tropical semifield.

As an application of this set of ideas, we show how to associate an idempotent version of the structure sheaf of a scheme, which behaves particularly well with respect to idempotization of closed subschemes. This is a joint work with Felix Baril Boudreau.

Other Information: 

Room: M1040


Time: 11:00am Pacific/ 12:00 Mountain



A recording of this event is available on mathtube.org.