Analysis Seminar
Janusz Wysoczanski, University of Wroclaw
Finitely Generated Weakly Monotone C*-algebras
4:00PM, 250 Math Building
Algebra Seminar
Anna Wysoczańska-Kula, Uniwersytet Wrocławski
Free resolution of universal unitary quantum groups
4:00PM, 250 Mathematics Building
Analysis Seminar
Wenbo Sun, Virginia Tech
Geometry Ramsey Conjecture over finite fields
4:00PM, 250 Math Building
Geometry and Topology Seminar
Matthew Stoffregen (Michigan State University)
TBA
4:00PM, 122 Mathematics Building
Algebra Seminar
Hecke algebras on homogeneous trees and relations with Hankel and Toeplitz matrices
Hecke algebras on homogeneous trees and relationswith Hankel and Toeplitz matrices Abstract : A homogeneous tree of degree \(q+1\) (a positive integer) is a connected graph, with no loops and with each vertex having exactly \(q+1\) neighbours. The distance \(d(x,y)\) between vertices \(x\) and \(y\) is the length of the uniquely defined geodesic connecting them. In particular there are \((q+1)q^{n-1}\)vertices at distance \(n>0\) from a given one. In this talk we consider distance-dependent two-variable functions (kernels) \(f(x,y)\), defined on pairs of vertices. The Hecke algebra on homogeneous tree is a commutative algebra, spanned by particular kernels, defined on pairs of vertices \((x,y)\)and indexed by non-negative integers \(f_n(x,y)\). Each of these kernels depends on the distance between the vertices and vanishes if the distance is not equal to their index, otherwise it equals 1. We will show that the Hecke algebra is generated by \(f_1\), which satisfies quadratic (Hecke) equation. Our main interest is in showing that the Hecke algebra is MASA (i.e. Maximal Abelian SubAlgebra) in some bigger algebra. If \(q>1\) then a geometric trick of a Y-turn on the tree will do the job. If \(q=1\), which corresponds to the tree of integers, the Y-turn is not possible, and we introduce some additional (Banach space)structure and show that the Hecke algebra is not MASA, but its commutant decomposes as a direct sum of Hankel and Toeplitz (double-infinite) matrices.
4:00PM, 250 Mathematics Building
Title: Hecke algebras on homogeneous trees and relationswith Hankel and Toeplitz matrices
Abstract : A homogeneous tree of degree \(q+1\) (a positive integer) is a connected graph, with no loops and with each vertex having exactly \(q+1\) neighbours. The distance \(d(x,y)\) between vertices \(x\) and \(y\) is the length of the uniquely defined geodesic connecting them. In particular there are \((q+1)q^{n-1}\)vertices at distance \(n>0\) from a given one. In this talk we consider distance-dependent two-variable functions (kernels) \(f(x,y)\), defined on pairs of vertices.
The Hecke algebra on homogeneous tree is a commutative algebra, spanned by particular kernels, defined on pairs of vertices \((x,y)\)and indexed by non-negative integers \(f_n(x,y)\). Each of these kernels depends on the distance between the vertices and vanishes if the distance is not equal to their index, otherwise it equals 1. We will show that the Hecke algebra is generated by \(f_1\), which satisfies quadratic (Hecke) equation. Our main interest is in showing that the Hecke algebra is MASA (i.e. Maximal Abelian SubAlgebra) in some bigger algebra.
If \(q>1\) then a geometric trick of a Y-turn on the tree will do the job. If \(q=1\), which corresponds to the tree of integers, the Y-turn is not possible, and we introduce some additional (Banach space)structure and show that the Hecke algebra is not MASA, but its commutant decomposes as a direct sum of Hankel and Toeplitz (double-infinite) matrices.
Analysis Seminar
Jakob Streipel, University of Maine
4:00PM, 250 Math Building
Applied Math Seminar
Mohammad-Ali Miri, Queens College CUNY
TBA.
3:00PM, Math 250
Analysis Seminar
Jingbo Xia, SUNY at Buffalo
4:00PM, 250 Math Building
Applied Math Seminar
Jia Zhao, Binghamton University
TBA.
3:00PM, Math 250
Analysis Seminar
Raphael Ponge, Sichuan University
4:00PM, 250 Math Building
Applied Math Seminar
Deniz Bilman, University of Cincinnati
TBA.
3:00PM, Math 250
Analysis Seminar
Joseph Leung, Rutgers University
4:00PM, 250 Math Building
Applied Math Seminar
Katerina Gkogkou, Tulane University
TBA.
3:00PM, Math 250
Analysis Seminar
Janusz Wysoczanski, University of Wroclaw
Finitely Generated Weakly Monotone C*-algebras
4:00PM, 250 Math Building
Algebra Seminar
Anna Wysoczańska-Kula, Uniwersytet Wrocławski
Free resolution of universal unitary quantum groups
4:00PM, 250 Mathematics Building
Analysis Seminar
Wenbo Sun, Virginia Tech
Geometry Ramsey Conjecture over finite fields
4:00PM, 250 Math Building
Geometry and Topology Seminar
Matthew Stoffregen (Michigan State University)
TBA
4:00PM, 122 Mathematics Building
Algebra Seminar
Hecke algebras on homogeneous trees and relations with Hankel and Toeplitz matrices
Hecke algebras on homogeneous trees and relationswith Hankel and Toeplitz matrices Abstract : A homogeneous tree of degree \(q+1\) (a positive integer) is a connected graph, with no loops and with each vertex having exactly \(q+1\) neighbours. The distance \(d(x,y)\) between vertices \(x\) and \(y\) is the length of the uniquely defined geodesic connecting them. In particular there are \((q+1)q^{n-1}\)vertices at distance \(n>0\) from a given one. In this talk we consider distance-dependent two-variable functions (kernels) \(f(x,y)\), defined on pairs of vertices. The Hecke algebra on homogeneous tree is a commutative algebra, spanned by particular kernels, defined on pairs of vertices \((x,y)\)and indexed by non-negative integers \(f_n(x,y)\). Each of these kernels depends on the distance between the vertices and vanishes if the distance is not equal to their index, otherwise it equals 1. We will show that the Hecke algebra is generated by \(f_1\), which satisfies quadratic (Hecke) equation. Our main interest is in showing that the Hecke algebra is MASA (i.e. Maximal Abelian SubAlgebra) in some bigger algebra. If \(q>1\) then a geometric trick of a Y-turn on the tree will do the job. If \(q=1\), which corresponds to the tree of integers, the Y-turn is not possible, and we introduce some additional (Banach space)structure and show that the Hecke algebra is not MASA, but its commutant decomposes as a direct sum of Hankel and Toeplitz (double-infinite) matrices.
4:00PM, 250 Mathematics Building
Title: Hecke algebras on homogeneous trees and relationswith Hankel and Toeplitz matrices
Abstract : A homogeneous tree of degree \(q+1\) (a positive integer) is a connected graph, with no loops and with each vertex having exactly \(q+1\) neighbours. The distance \(d(x,y)\) between vertices \(x\) and \(y\) is the length of the uniquely defined geodesic connecting them. In particular there are \((q+1)q^{n-1}\)vertices at distance \(n>0\) from a given one. In this talk we consider distance-dependent two-variable functions (kernels) \(f(x,y)\), defined on pairs of vertices.
The Hecke algebra on homogeneous tree is a commutative algebra, spanned by particular kernels, defined on pairs of vertices \((x,y)\)and indexed by non-negative integers \(f_n(x,y)\). Each of these kernels depends on the distance between the vertices and vanishes if the distance is not equal to their index, otherwise it equals 1. We will show that the Hecke algebra is generated by \(f_1\), which satisfies quadratic (Hecke) equation. Our main interest is in showing that the Hecke algebra is MASA (i.e. Maximal Abelian SubAlgebra) in some bigger algebra.
If \(q>1\) then a geometric trick of a Y-turn on the tree will do the job. If \(q=1\), which corresponds to the tree of integers, the Y-turn is not possible, and we introduce some additional (Banach space)structure and show that the Hecke algebra is not MASA, but its commutant decomposes as a direct sum of Hankel and Toeplitz (double-infinite) matrices.
Analysis Seminar
Jakob Streipel, University of Maine
4:00PM, 250 Math Building
Applied Math Seminar
Mohammad-Ali Miri, Queens College CUNY
TBA.
3:00PM, Math 250
Analysis Seminar
Jingbo Xia, SUNY at Buffalo
4:00PM, 250 Math Building
Applied Math Seminar
Jia Zhao, Binghamton University
TBA.
3:00PM, Math 250
Analysis Seminar
Raphael Ponge, Sichuan University
4:00PM, 250 Math Building
Applied Math Seminar
Deniz Bilman, University of Cincinnati
TBA.
3:00PM, Math 250
Analysis Seminar
Joseph Leung, Rutgers University
4:00PM, 250 Math Building
Applied Math Seminar
Katerina Gkogkou, Tulane University
TBA.
3:00PM, Math 250