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Events for November 2025 – March 2026

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Tue, Nov. 4 3:30pm (MATH 3…	Topology Ben Knudsen (Colorado State University) TBD
Thu, Nov. 6 11:15am (MATH …	Algebraic Geometry Lisa Marquand (NYU) TBD Sponsored by the Meyer Fund
Thu, Nov. 6 2:30pm (MATH 3…	Functional Analysis James Woodcock (CU Boulder) X Minimal homeomorphisms of topological spaces provide a source of simple C-algebras whose structure and K-theory can be understood through dynamical systems. I will present results on the existence of minimal homeomorphisms of flat manifolds with positive first Betti number. When the flat manifold has a spin^c structure we will show that the resulting cross product satisfies Poincare Duality for C-algebras. Finally, I will describe ongoing work toward constructing explicit KK-cycle representatives in the presence of minimal flows, in analogy with the classical case of irrational rotation algebras. Flat manifolds, C*-algebras, and duality
Tue, Nov. 11 1:25pm (online)	Algebra/Logic George Metcalfe (University Bern) View Online:https://cuboulder.zoom.us/j/96896272260 X This talk will be about idempotent semifields, which, from a purely algebraic perspective are just lattice-ordered groups formulated in a restricted language with the group multiplication, neutral element, and lattice-join operation. We will see that although countably infinitely many equational theories of lattice-ordered groups have a finite equational basis, no non-trivial equational theory of idempotent semifields has this property. On the other hand, as in the case of lattice-ordered groups, there are continuum-many equational theories of classes of idempotent semifields. Finally, we will relate the problem of deciding equations in the class of idempotent semifields to the problem of deciding if there exists a right order on a free group satisfying a given finite set of inequalities, and show that these problems are, respectively, co-NP-complete and NP-complete. This is joint work with Simon Santschi. Equational Theories of Idempotent Semifields
Wed, Nov. 12 4:30pm (TBD)	Algebraic Geometry Zhijia Zhang (NYU) X TBD TBD - Note the unusual time and date Sponsored by the Meyer Fund
Tue, Nov. 18 1:25pm (MATH 2…	Algebra/Logic Simon Santschi (University Bern) View Online:https://cuboulder.zoom.us/j/96896272260 TBA
Tue, Nov. 18 3:30pm (MATH 3…	Topology Rick TBD
Wed, Nov. 19 4:40pm (MATH 3…	Grad Student Seminar Basia Klos (CU Boulder) X TBD What even is a VOA?
Tue, Dec. 2 3:30pm (MATH 3…	Topology Stephanie TBD

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