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Department of Mathematics and Computer Science | |
Number Theory and Combinatorics Seminar | |
Spring 2023 | |
For more information,
contact
Félix Baril Boudreau
<felix.barilboudreau@uleth.ca>.
Talks are usually at noon on Monday in room M1040 (Markin Hall). All times are Mountain Time. | |
The live access zoom link is available here and on researchseminars.org, and is also sent to our mailing list. |
The next talk: | |||
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Feb 6
at noon via zoom |
Cristhian Garay
(CIMAT Guanajuato, Mexico) |
Generalized valuations and idempotization of schemes
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 Félix Baril Boudreau. |
Click on any title for more info, including the abstract. Then
click on it again to hide the info.
When available, click on the mathtube icon ![]() |
Date | Speaker | Title | |
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Jan 9 | Youness Lamzouri | A walk on Legendre paths | |
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(Institut Élie Cartan de Lorraine, France)
PIMS Distinguished Speaker Series |
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Jan 16 | Neelam Kandhil | On linear independence of Dirichlet L-values | |
at 9:30am via zoom |
(Institute of Mathematical Sciences, Chennai, India) | ||
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Jan 23 | Antonella Perucca | Recent advances in Kummer theory | |
via zoom |
at 9:30am (University of Luxembourg) | ||
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Jan 30 | Oussama Hamza | Filtrations, arithmetic and explicit examples in an equivariant context | |
via zoom | (University of Western Ontario) | ||
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Feb 6 | Cristhian Garay | Generalized valuations and idempotization of schemes | |
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(CIMAT Guanajuato, Mexico) | ||
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Feb 6 | Cristhian Garay | An invitation to the algebraic geometry over idempotent semirings | |
3:10–4:45pm in B716 ![]() |
(CIMAT Guanajuato, Mexico) |
Minicourse, Lecture 1 |
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The minicourse will also be streamed online. To attend (one or both sessions) via zoom, register at:
https://uleth.zoom.us/meeting/register/tJYuc-uqrz4pE93dDYPcP3Ek7CbrJCFISazV | |||
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Feb 9 | Cristhian Garay | An invitation to the algebraic geometry over idempotent semirings | |
3:10–4:45pm in B716 ![]() |
(CIMAT Guanajuato, Mexico) |
Minicourse, Lecture 2 |
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The minicourse will also be streamed online. To attend (one or both sessions) via zoom, register at:
https://uleth.zoom.us/meeting/register/tJYuc-uqrz4pE93dDYPcP3Ek7CbrJCFISazV | |||
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Feb 13 | Speaker TBA | Title TBA | |
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Feb 27 | Florent Jouve | Title TBA | |
at 9:30am via zoom | (Université de Bordeaux, France) | ||
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Mar 6 | John Voight | Title TBA | |
via zoom |
at noon (Dartmouth College, USA) | ||
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Mar 13 | Renate Scheidler | Title TBA | |
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(University of Calgary) | ||
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Mar 20 | Joshua Males | Title TBA | |
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(University of Manitoba) | ||
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Mar 27 | Douglas Ulmer | Title TBA | |
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(University of Arizona) | ||
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Apr 3 | Harald Andrés Helfgott | Title TBA | |
via zoom |
at time tba (University of Göttingen, Germany, and Institut de Mathématiques de Jussieu, France) | ||
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Past semesters: | Fall | F07 | F08 | F09 | F10 | F11 | F12 | F13 | F14 | F15 | F16 | F17 | F18 | F19 | F20 | F21 | F22 |
Spring | S08 | S09 | S10 | S12 | S13 | S14 | S15 | S16 | S17 | S18 | S19 | S20 | S21 | S22 |
Click here for a PDF file of abstracts of all talks back to 2007 (approx 440K). |