Events for 04/19/2023 from all calendars

Noncommutative Geometry Seminar

Time: 2:00PM - 3:00PM

Location: BLOC 302

Speaker: Arturo Jaime, University of Hawaii

Title: Finite complexity rank for C*-algebras

Abstract: Motivated by two earlier ideas of decomposability in coarse geometry (Guentner, Tessera, and Yu) and dynamics (Guentner, Willett, and Yu) and nuclear dimension of C*-algebras (Winter and Zacharias), Willett and Yu introduced the notion of complexity rank for C*-algebras: essentially the number of times a C*-algebra can be cut into well-interacting parts until you reach something finite-dimensional. In this talk we will discuss results relating a weaker notion of complexity rank to nuclear dimension one and real rank zero. We then discuss torsion vanishing in K_1 for unital C*-algebras having finite complexity rank at most one. Finally we fit these results into the context of the broader work of Willett and Yu on the UCT. This is based on joint work with Rufus Willett.

AMUSE

Time: 6:00PM - 7:00PM

Location: BLOC 117

Speaker: Jesús A. De Loera, University of California, Davis

Title: Easy to State but Very Hard to Solve: My Favorite Unsolved Problems about Polyhedra

Abstract: Sadly the public has very little idea of what mathematicians do. Do they add bigger and bigger numbers? Do they balance big checkbooks? In this talk I will try to give you a taste of my own research in computational geometry through objects that are very pretty and are familiar to everyone from a young age. Polygons, triangles, squares, cubes, or pyramids are familiar shapes from childhood. Polyhedra, are their high-dimensional versions,and turn out to be widely used in applied mathematics. Their beauty and simplicity appeal to all, but very few people know of the many easy-to-state but difficult-to-solve mathematical problems that hide behind their beauty. This lecture will have lots of nice pictures and will introduces the audience to some fascinating unsolved questions at the frontier of mathematical research and its applications. No prior knowledge beyond your memory of elementary school geometry will be assumed.

URL: Event link

Geller Undergraduate Lecture

Time: 6:00PM - 7:00PM

Location: BLOC 117

Speaker: Jesus De Loera, University of California, Davis

Description: This will be a combined event with AMUSE. Reception starts at 5:30.