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Seminar information archive
Seminar information archive ～06/02｜Today's seminar 06/03 | Future seminars 06/04～
2020/02/12
Seminar on Probability and Statistics
15:00-16:10 Room #126 (Graduate School of Math. Sci. Bldg.)
Lorenzo Mercuri (University of Milan)
Handling the underlying noise of Stochastic Differential Equations in YUIMA project
Lorenzo Mercuri (University of Milan)
Handling the underlying noise of Stochastic Differential Equations in YUIMA project
[ Abstract ]
Some advances in the implementation of advanced mathematical tools and numerical methods for an object of class yuima.law are presented and discussed. An object of yuima.law-class refers to the mathematical description of the underlying noise specified in the formal definition of a general Stochastic Differential Equation. Its aim is to create a link between YUIMA and other R packages available on CRAN for managing specific Lévy noises. Here we present as examples the simulation and the estimation of a CARMA(p,q) and Point Process regression models.
Some advances in the implementation of advanced mathematical tools and numerical methods for an object of class yuima.law are presented and discussed. An object of yuima.law-class refers to the mathematical description of the underlying noise specified in the formal definition of a general Stochastic Differential Equation. Its aim is to create a link between YUIMA and other R packages available on CRAN for managing specific Lévy noises. Here we present as examples the simulation and the estimation of a CARMA(p,q) and Point Process regression models.
2020/02/05
Lie Groups and Representation Theory
15:00-16:00 Room #126 (Graduate School of Math. Sci. Bldg.)
Simon Gindikin (Rutgers University)
Direct inversion of the horospherical transform on Riemannian symmetric spaces (English)
Simon Gindikin (Rutgers University)
Direct inversion of the horospherical transform on Riemannian symmetric spaces (English)
[ Abstract ]
It was a problem of Gelfand to find an inversion of the horospherical transform directly and as a result to find directly the Plancherel formula.
I will give such an inversion and it gives a formula different from Harish-Chandra's one.
It was a problem of Gelfand to find an inversion of the horospherical transform directly and as a result to find directly the Plancherel formula.
I will give such an inversion and it gives a formula different from Harish-Chandra's one.
2020/01/31
thesis presentations
9:15-10:30 Room #118 (Graduate School of Math. Sci. Bldg.)
thesis presentations
10:45-12:00 Room #118 (Graduate School of Math. Sci. Bldg.)
thesis presentations
12:45-14:00 Room #118 (Graduate School of Math. Sci. Bldg.)
thesis presentations
14:15-15:30 Room #118 (Graduate School of Math. Sci. Bldg.)
thesis presentations
9:15-10:30 Room #122 (Graduate School of Math. Sci. Bldg.)
thesis presentations
10:45-12:00 Room #122 (Graduate School of Math. Sci. Bldg.)
thesis presentations
12:45-14:00 Room #122 (Graduate School of Math. Sci. Bldg.)
thesis presentations
14:15-15:30 Room #122 (Graduate School of Math. Sci. Bldg.)
thesis presentations
9:15-10:30 Room #126 (Graduate School of Math. Sci. Bldg.)
thesis presentations
10:45-12:00 Room #126 (Graduate School of Math. Sci. Bldg.)
thesis presentations
12:45-14:00 Room #126 (Graduate School of Math. Sci. Bldg.)
thesis presentations
14:15-15:30 Room #126 (Graduate School of Math. Sci. Bldg.)
2020/01/30
thesis presentations
10:45-12:00 Room #118 (Graduate School of Math. Sci. Bldg.)
thesis presentations
12:45-14:00 Room #118 (Graduate School of Math. Sci. Bldg.)
thesis presentations
14:15-15:30 Room #118 (Graduate School of Math. Sci. Bldg.)
thesis presentations
15:45-17:00 Room #118 (Graduate School of Math. Sci. Bldg.)
thesis presentations
9:15-10:30 Room #122 (Graduate School of Math. Sci. Bldg.)
thesis presentations
12:45-14:00 Room #122 (Graduate School of Math. Sci. Bldg.)
thesis presentations
13:45-15:00 Room #126 (Graduate School of Math. Sci. Bldg.)
2020/01/29
Operator Algebra Seminars
13:00-14:30 Room #002 (Graduate School of Math. Sci. Bldg.)
Colin McSwiggen (Brown Univ.)
Horn's problem, polytope volumes and tensor product decompositions (English)
Colin McSwiggen (Brown Univ.)
Horn's problem, polytope volumes and tensor product decompositions (English)
Operator Algebra Seminars
16:45-18:15 Room #126 (Graduate School of Math. Sci. Bldg.)
Cyril Houdayer (Univ. Paris-Sud)
Stationary actions of higher rank lattices on von Neumann algebras (English)
Cyril Houdayer (Univ. Paris-Sud)
Stationary actions of higher rank lattices on von Neumann algebras (English)
2020/01/28
Tuesday Seminar on Topology
17:00-18:00 Room #056 (Graduate School of Math. Sci. Bldg.)
Nozomu Sekino (The University of Tokyo)
Existence problems for fibered links (JAPANESE)
Nozomu Sekino (The University of Tokyo)
Existence problems for fibered links (JAPANESE)
[ Abstract ]
It is known that every connected orientable closed 3-manifold has a fibered knot. However, finding (and classifying) fibered links whose fiber surfaces are fixed homeomorphism type in a given 3-manifold is difficult in general. We give a criterion of a simple closed curve on a genus 2g Heegaard surface being a genus g fibered knot in terms of its Heegaard diagram. As an application, we can prove the non-existence of genus one fibered knots in some Seifert manifolds.
There is one generalization of fibered links, homologically fibered links. This requests that the complement of the "fiber surface" is a homologically product of a surface and an interval. We give a necessary and sufficient condition for a connected sums of lens spaces of having a homologically fibered link whose fiber surfaces are some fixed types as some algebraic equations.
It is known that every connected orientable closed 3-manifold has a fibered knot. However, finding (and classifying) fibered links whose fiber surfaces are fixed homeomorphism type in a given 3-manifold is difficult in general. We give a criterion of a simple closed curve on a genus 2g Heegaard surface being a genus g fibered knot in terms of its Heegaard diagram. As an application, we can prove the non-existence of genus one fibered knots in some Seifert manifolds.
There is one generalization of fibered links, homologically fibered links. This requests that the complement of the "fiber surface" is a homologically product of a surface and an interval. We give a necessary and sufficient condition for a connected sums of lens spaces of having a homologically fibered link whose fiber surfaces are some fixed types as some algebraic equations.
Tuesday Seminar on Topology
18:00-19:00 Room #056 (Graduate School of Math. Sci. Bldg.)
Jun Watanabe (The University of Tokyo)
Fibred cusp b-pseudodifferential operators and its applications (JAPANESE)
Jun Watanabe (The University of Tokyo)
Fibred cusp b-pseudodifferential operators and its applications (JAPANESE)
[ Abstract ]
Melrose's b-calculus and its variants are important tools to study index problems on manifolds with singularities. In this talk, we introduce a new variant "fibred cusp b-calculus", which is a generalization of fibred cusp calculus of Mazzeo-Melrose and b-calculus of Melrose. We discuss the basic property of this calculus and give a relative index formula. As its application, we prove the index theorem for a Z/k manifold with boundary, which is a generalization of the mod k index theorem of Freed-Melrose.
Melrose's b-calculus and its variants are important tools to study index problems on manifolds with singularities. In this talk, we introduce a new variant "fibred cusp b-calculus", which is a generalization of fibred cusp calculus of Mazzeo-Melrose and b-calculus of Melrose. We discuss the basic property of this calculus and give a relative index formula. As its application, we prove the index theorem for a Z/k manifold with boundary, which is a generalization of the mod k index theorem of Freed-Melrose.
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