Seminar information archive
Seminar information archive ～12/08｜Today's seminar 12/09  Future seminars 12/10～
thesis presentations
11:0012:15 Online
Yuki Yamamoto (Graduate School of Mathematical Sciences University of Tokyo)
On the restrictions of supercuspidal representations for inner forms of GL_N
[ Reference URL ]
https://forms.gle/bdsntP4pZ4TMaehF9
Yuki Yamamoto (Graduate School of Mathematical Sciences University of Tokyo)
On the restrictions of supercuspidal representations for inner forms of GL_N
[ Reference URL ]
https://forms.gle/bdsntP4pZ4TMaehF9
2022/01/27
Information Mathematics Seminar
16:5018:35 Online
Yusuke Aikawa (Information Technology R&D Center, Mitsubishi Electric Co.)
Recent development of postquantum cryptography from supersingular elliptic curves (Japanese)
https://docs.google.com/forms/d/1WLEbsA2aQTXgdE2ynrumJOGZ4AVWqcOLCz42B4nPY
Yusuke Aikawa (Information Technology R&D Center, Mitsubishi Electric Co.)
Recent development of postquantum cryptography from supersingular elliptic curves (Japanese)
[ Abstract ]
Explanation on recent development of postquantum cryptography from supersingular elliptic curves
[ Reference URL ]Explanation on recent development of postquantum cryptography from supersingular elliptic curves
https://docs.google.com/forms/d/1WLEbsA2aQTXgdE2ynrumJOGZ4AVWqcOLCz42B4nPY
thesis presentations
13:0014:15 Online
Masaru Miyashita (Graduate School of Mathematical Sciences University of Tokyo)
Some new approaches to the finite element method for digital twins of plasma
[ Reference URL ]
https://forms.gle/bdsntP4pZ4TMaehF9
Masaru Miyashita (Graduate School of Mathematical Sciences University of Tokyo)
Some new approaches to the finite element method for digital twins of plasma
[ Reference URL ]
https://forms.gle/bdsntP4pZ4TMaehF9
thesis presentations
13:0014:15 Online
Keiichi Maeta (Graduate School of Mathematical Sciences University of Tokyo)
On the existence problem of compact CliffordKlein forms of indecomposable pseudoRiemannian symmetric spaces with signature (n, 2)
[ Reference URL ]
https://forms.gle/bdsntP4pZ4TMaehF9
Keiichi Maeta (Graduate School of Mathematical Sciences University of Tokyo)
On the existence problem of compact CliffordKlein forms of indecomposable pseudoRiemannian symmetric spaces with signature (n, 2)
[ Reference URL ]
https://forms.gle/bdsntP4pZ4TMaehF9
thesis presentations
9:1510:30 Online
Nobuo Iida (Graduate School of Mathematical Sciences University of Tokyo)
A stable homotopy version of monopole contact invariant
[ Reference URL ]
https://forms.gle/bdsntP4pZ4TMaehF9
Nobuo Iida (Graduate School of Mathematical Sciences University of Tokyo)
A stable homotopy version of monopole contact invariant
[ Reference URL ]
https://forms.gle/bdsntP4pZ4TMaehF9
thesis presentations
11:0012:15 Online
Jun Okamoto (Graduate School of Mathematical Sciences University of Tokyo)
Convergence of some nonconvex energies under various topology
[ Reference URL ]
https://forms.gle/bdsntP4pZ4TMaehF9
Jun Okamoto (Graduate School of Mathematical Sciences University of Tokyo)
Convergence of some nonconvex energies under various topology
[ Reference URL ]
https://forms.gle/bdsntP4pZ4TMaehF9
thesis presentations
11:0012:15 Online
Yasuhiro Oki (Graduate School of Mathematical Sciences University of Tokyo)
On the connected components of Shimura varieties for CM unitary groups in odd variables
[ Reference URL ]
https://forms.gle/bdsntP4pZ4TMaehF9
Yasuhiro Oki (Graduate School of Mathematical Sciences University of Tokyo)
On the connected components of Shimura varieties for CM unitary groups in odd variables
[ Reference URL ]
https://forms.gle/bdsntP4pZ4TMaehF9
thesis presentations
13:0014:15 Online
Tatsuro Kawakami (Graduate School of Mathematical Sciences University of Tokyo)
Studies on the BogomolovSommese vanishing theorem and Du Val del Pezzo surfaces in positive characteristic
[ Reference URL ]
https://forms.gle/bdsntP4pZ4TMaehF9
Tatsuro Kawakami (Graduate School of Mathematical Sciences University of Tokyo)
Studies on the BogomolovSommese vanishing theorem and Du Val del Pezzo surfaces in positive characteristic
[ Reference URL ]
https://forms.gle/bdsntP4pZ4TMaehF9
thesis presentations
9:1510:30 Online
Cyuyou Ko (Graduate School of Mathematical Sciences University of Tokyo)
On the Helmholtz decomposition of vector fields with bounded mean oscillation in various domains
[ Reference URL ]
https://forms.gle/bdsntP4pZ4TMaehF9
Cyuyou Ko (Graduate School of Mathematical Sciences University of Tokyo)
On the Helmholtz decomposition of vector fields with bounded mean oscillation in various domains
[ Reference URL ]
https://forms.gle/bdsntP4pZ4TMaehF9
thesis presentations
11:0012:15 Online
Masatoshi Goda (Graduate School of Mathematical Sciences University of Tokyo)
Statistical inference for Hawkes processes
[ Reference URL ]
https://forms.gle/bdsntP4pZ4TMaehF9
Masatoshi Goda (Graduate School of Mathematical Sciences University of Tokyo)
Statistical inference for Hawkes processes
[ Reference URL ]
https://forms.gle/bdsntP4pZ4TMaehF9
thesis presentations
14:4516:00 Online
Yusuke Sato (Graduate School of Mathematical Sciences University of Tokyo)
Multidimensional continued fractions and FujikiOka resolutions of cyclic quotient singularities
[ Reference URL ]
https://forms.gle/bdsntP4pZ4TMaehF9
Yusuke Sato (Graduate School of Mathematical Sciences University of Tokyo)
Multidimensional continued fractions and FujikiOka resolutions of cyclic quotient singularities
[ Reference URL ]
https://forms.gle/bdsntP4pZ4TMaehF9
thesis presentations
11:0012:15 Online
Taketo Sano (Graduate School of Mathematical Sciences University of Tokyo)
On functoriality and spatial refinements of Khovanov homology and its variants
[ Reference URL ]
https://forms.gle/bdsntP4pZ4TMaehF9
Taketo Sano (Graduate School of Mathematical Sciences University of Tokyo)
On functoriality and spatial refinements of Khovanov homology and its variants
[ Reference URL ]
https://forms.gle/bdsntP4pZ4TMaehF9
thesis presentations
14:4516:00 Online
Hiroshi Takase (Graduate School of Mathematical Sciences University of Tokyo)
Inverse problems for hyperbolic partial differential equations with timedependent coefficients
[ Reference URL ]
https://forms.gle/bdsntP4pZ4TMaehF9
Hiroshi Takase (Graduate School of Mathematical Sciences University of Tokyo)
Inverse problems for hyperbolic partial differential equations with timedependent coefficients
[ Reference URL ]
https://forms.gle/bdsntP4pZ4TMaehF9
thesis presentations
14:4516:00 Online
Mayuko Yamashita (RIMS, Kyoto University)
Differential models for the Anderson dual to bordism theories and invertible QFT’s
[ Reference URL ]
https://forms.gle/bdsntP4pZ4TMaehF9
Mayuko Yamashita (RIMS, Kyoto University)
Differential models for the Anderson dual to bordism theories and invertible QFT’s
[ Reference URL ]
https://forms.gle/bdsntP4pZ4TMaehF9
2022/01/25
Tuesday Seminar on Topology
17:0018:00 Online
Preregistration required. See our seminar webpage.
Xiaobing Sheng (The Univesity of Tokyo)
Some obstructions on subgroups of the BrinThompson group $2V$ (ENGLISH)
https://park.itc.utokyo.ac.jp/MSF/topology/TuesdaySeminar/index_e.html
Preregistration required. See our seminar webpage.
Xiaobing Sheng (The Univesity of Tokyo)
Some obstructions on subgroups of the BrinThompson group $2V$ (ENGLISH)
[ Abstract ]
Motivated by Burillo, Cleary and Röver's summary of the obstruction for subgroups of Thompson's group $V$, we investigate the higher dimensional version, the group $2V$ and found out that they have similar obstructions on torsion subgroups and certain BaumslagSolitar groups.
[ Reference URL ]Motivated by Burillo, Cleary and Röver's summary of the obstruction for subgroups of Thompson's group $V$, we investigate the higher dimensional version, the group $2V$ and found out that they have similar obstructions on torsion subgroups and certain BaumslagSolitar groups.
https://park.itc.utokyo.ac.jp/MSF/topology/TuesdaySeminar/index_e.html
2022/01/24
Seminar on Geometric Complex Analysis
10:3012:00 Room #128 (Graduate School of Math. Sci. Bldg.)
Junjiro Noguchi (The University of Tokyo)
Analytic AxSchanuel Theorem for semiabelian varieties and Nevanlinna theory (Japanese)
https://utokyoacjp.zoom.us/meeting/register/tJ0vcu2rrDIqG9Rv5AT0Mpi37urIkJ1IRldB
Junjiro Noguchi (The University of Tokyo)
Analytic AxSchanuel Theorem for semiabelian varieties and Nevanlinna theory (Japanese)
[ Abstract ]
The present study is motivated by $\textit{Schanuel Conjecture}$, which in particular implies the algebraic independence of $e$ and $\pi$. Our aim is to explore, as a transcendental functional analogue of Schanuel Conjecture, the value distribution theory (Nevanlinna theory) of the entire curve $\widehat{\mathrm{ex}}_A f:=(\exp_Af,f):\mathbf{C} \to A \times \mathrm{Lie}(A)$ associated with an entire curve $f: \mathbf{C} \to \mathrm{Lie}(A)$, where $\exp_A:\mathrm{Lie}(A)\to A$ is an exponential map of a semiabelian variety $A$.
We firstly give a Nevanlinna theoretic proof to the $\textit{analytic AxSchanuel Theorem}$ for semiabelian varieties, which was proved by J. Ax 1972 in the case of formal power series $\mathbf{C}[[t]]$ (AxSchanuel Theorem). We assume some nondegeneracy condition for $f$ such that in the case of $A=(\mathbf{C}^*)^n$ and $\mathrm{Lie}((\mathbf{C}^*)^n)=\mathbf{C}^n$, the elements of the vectorvalued function $f(z)f(0)$ are $\mathbf{Q}$linearly independent. Then by the method of Nevanlinna theory (the Log BlochOchiai Theorem), we prove that $\mathrm{tr.deg}_\mathbf{C}\, \widehat{\mathrm{ex}}_A f \geq n+ 1.$
Secondly, we prove a $\textit{Second Main Theorem}$ for $\widehat{\mathrm{ex}}_A f$ and an algebraic divisor $D$ on $A \times \mathrm{Lie}(A)$ with compactifications $\bar D \subset \bar A \times \overline{\mathrm{Lie}(A)}$ such that
\[
T_{\widehat{\mathrm{ex}}_Af}(r, L({\bar D})) \leq N_1 (r,
(\widehat{\mathrm{ex}}_A f)^* D)+
\varepsilon T_{\exp_Af}(r)+O(\log r) ~~ _\varepsilon.
\]
We will also deal with the intersections of $\widehat{\mathrm{ex}}_Af$ with higher codimensional algebraic cycles of $A \times \mathrm{Lie}(A)$ as well as the case of higher jets.
[ Reference URL ]The present study is motivated by $\textit{Schanuel Conjecture}$, which in particular implies the algebraic independence of $e$ and $\pi$. Our aim is to explore, as a transcendental functional analogue of Schanuel Conjecture, the value distribution theory (Nevanlinna theory) of the entire curve $\widehat{\mathrm{ex}}_A f:=(\exp_Af,f):\mathbf{C} \to A \times \mathrm{Lie}(A)$ associated with an entire curve $f: \mathbf{C} \to \mathrm{Lie}(A)$, where $\exp_A:\mathrm{Lie}(A)\to A$ is an exponential map of a semiabelian variety $A$.
We firstly give a Nevanlinna theoretic proof to the $\textit{analytic AxSchanuel Theorem}$ for semiabelian varieties, which was proved by J. Ax 1972 in the case of formal power series $\mathbf{C}[[t]]$ (AxSchanuel Theorem). We assume some nondegeneracy condition for $f$ such that in the case of $A=(\mathbf{C}^*)^n$ and $\mathrm{Lie}((\mathbf{C}^*)^n)=\mathbf{C}^n$, the elements of the vectorvalued function $f(z)f(0)$ are $\mathbf{Q}$linearly independent. Then by the method of Nevanlinna theory (the Log BlochOchiai Theorem), we prove that $\mathrm{tr.deg}_\mathbf{C}\, \widehat{\mathrm{ex}}_A f \geq n+ 1.$
Secondly, we prove a $\textit{Second Main Theorem}$ for $\widehat{\mathrm{ex}}_A f$ and an algebraic divisor $D$ on $A \times \mathrm{Lie}(A)$ with compactifications $\bar D \subset \bar A \times \overline{\mathrm{Lie}(A)}$ such that
\[
T_{\widehat{\mathrm{ex}}_Af}(r, L({\bar D})) \leq N_1 (r,
(\widehat{\mathrm{ex}}_A f)^* D)+
\varepsilon T_{\exp_Af}(r)+O(\log r) ~~ _\varepsilon.
\]
We will also deal with the intersections of $\widehat{\mathrm{ex}}_Af$ with higher codimensional algebraic cycles of $A \times \mathrm{Lie}(A)$ as well as the case of higher jets.
https://utokyoacjp.zoom.us/meeting/register/tJ0vcu2rrDIqG9Rv5AT0Mpi37urIkJ1IRldB
2022/01/21
Colloquium
15:3016:30 Online
Registration is closed (12:00, January 21).
Yoshiko Ogata (Graduate School of Mathematical Sciences, The University of Tokyo)
Classification of gapped ground state phases in quantum spin systems (JAPANESE)
Registration is closed (12:00, January 21).
Yoshiko Ogata (Graduate School of Mathematical Sciences, The University of Tokyo)
Classification of gapped ground state phases in quantum spin systems (JAPANESE)
TokyoNagoya Algebra Seminar
16:4518:15 Online
Please see the URL below for details on the online seminar.
Haruhisa Enomoto (Osaka Prefecture University)
Exactcategorical properties of subcategories of abelian categories 2 (Japanese)
http://www.math.nagoyau.ac.jp/~aaron.chan/TNAseminar.html
Please see the URL below for details on the online seminar.
Haruhisa Enomoto (Osaka Prefecture University)
Exactcategorical properties of subcategories of abelian categories 2 (Japanese)
[ Abstract ]
Quillen's exact category is a powerful framework for studying extensionclosed subcategories of abelian categories, and provides many interesting questions on such subcategories.
In the first talk, I will explain the basics of some properties and invariants of exact categories (e.g. the JordanHolder property, simple objects, and Grothendieck monoid).
In the second talk, I will give some results and questions about particular classes of exact categories arising in the representation theory of algebras (e.g. torsion(free) classes over path algebras and preprojective algebras).
If time permits, I will discuss questions of whether these results can be generalized to extriangulated categories (extensionclosed subcategories of triangulated categories).
[ Reference URL ]Quillen's exact category is a powerful framework for studying extensionclosed subcategories of abelian categories, and provides many interesting questions on such subcategories.
In the first talk, I will explain the basics of some properties and invariants of exact categories (e.g. the JordanHolder property, simple objects, and Grothendieck monoid).
In the second talk, I will give some results and questions about particular classes of exact categories arising in the representation theory of algebras (e.g. torsion(free) classes over path algebras and preprojective algebras).
If time permits, I will discuss questions of whether these results can be generalized to extriangulated categories (extensionclosed subcategories of triangulated categories).
http://www.math.nagoyau.ac.jp/~aaron.chan/TNAseminar.html
2022/01/20
Seminar on Probability and Statistics
15:0016:10 Room # (Graduate School of Math. Sci. Bldg.)
Yoshimasa Uematsu ()

[ Reference URL ]
https://docs.google.com/forms/d/e/1FAIpQLSdH8oP72k7qsHigZBBZ4F6NbGIJ6BcOWgKLhted2ohGSBeg/viewform
Yoshimasa Uematsu ()

[ Reference URL ]
https://docs.google.com/forms/d/e/1FAIpQLSdH8oP72k7qsHigZBBZ4F6NbGIJ6BcOWgKLhted2ohGSBeg/viewform
2022/01/19
Mathematical Biology Seminar
15:0016:00 Online
Tsuyoshi Kajiwara (Professor Emeritus, Okayama University)
Destabilization induced by time delay, immunity and absorbing effect
(Japanese)
[ Reference URL ]
オンラインですので，参加希望のかたは稲葉(inaba@ms.utokyo.ac.jp)へご連絡ください．
Tsuyoshi Kajiwara (Professor Emeritus, Okayama University)
Destabilization induced by time delay, immunity and absorbing effect
(Japanese)
[ Reference URL ]
オンラインですので，参加希望のかたは稲葉(inaba@ms.utokyo.ac.jp)へご連絡ください．
Seminar on Probability and Statistics
14:3016:00 Room # (Graduate School of Math. Sci. Bldg.)
Martin Hazelton (Otago University)
Dynamic fibre samplers for linear inverse problems
https://docs.google.com/forms/d/e/1FAIpQLSeoXt5v8xdQNFAKTDLoD0lttaHjV17_r7864x11mtxU1EQlhQ/viewform
Martin Hazelton (Otago University)
Dynamic fibre samplers for linear inverse problems
[ Abstract ]
AsiaPacific Seminar in Probability and Statistics (APSPS)
https://sites.google.com/view/apsps/home
Statistical inverse problems occur when we wish to learn about some random process that is observed only indirectly. Inference in such situations typically involves sampling possible values for the latent variables of interest conditional on the indirect observations. For count data, the latent variables are constrained to lie on a fibre (solution set for the linear system) comprising the integer lattice within a convex polytope.
Sampling the latent counts can be conducted using MCMC methods,through a random walk on this fibre. A major challenge is finding a set of basic moves that ensures connectedness of the walk over the fibre. In principle this can be done by computing a Markov basis of potential moves, but the resulting sampler can be hugely inefficient even when such a basis is computable. In this talk I will describe some current work on developing a dynamic Markov basis that generates moves on the fly. This approach can guarantee irreducibility of the sampler while gaining efficiency by increasing the probability of selecting serviceable sampling directions.
[ Reference URL ]AsiaPacific Seminar in Probability and Statistics (APSPS)
https://sites.google.com/view/apsps/home
Statistical inverse problems occur when we wish to learn about some random process that is observed only indirectly. Inference in such situations typically involves sampling possible values for the latent variables of interest conditional on the indirect observations. For count data, the latent variables are constrained to lie on a fibre (solution set for the linear system) comprising the integer lattice within a convex polytope.
Sampling the latent counts can be conducted using MCMC methods,through a random walk on this fibre. A major challenge is finding a set of basic moves that ensures connectedness of the walk over the fibre. In principle this can be done by computing a Markov basis of potential moves, but the resulting sampler can be hugely inefficient even when such a basis is computable. In this talk I will describe some current work on developing a dynamic Markov basis that generates moves on the fly. This approach can guarantee irreducibility of the sampler while gaining efficiency by increasing the probability of selecting serviceable sampling directions.
https://docs.google.com/forms/d/e/1FAIpQLSeoXt5v8xdQNFAKTDLoD0lttaHjV17_r7864x11mtxU1EQlhQ/viewform
2022/01/18
Operator Algebra Seminars
16:4518:15 Online
Miho Mukohara (Univ. Tokyo)
C$^*$simplicity of relative profinite completions of generalized BaumslagSolitar groups
[ Reference URL ]
https://www.ms.utokyo.ac.jp/~yasuyuki/tokyoseminar.htm
Miho Mukohara (Univ. Tokyo)
C$^*$simplicity of relative profinite completions of generalized BaumslagSolitar groups
[ Reference URL ]
https://www.ms.utokyo.ac.jp/~yasuyuki/tokyoseminar.htm
TokyoNagoya Algebra Seminar
15:0016:30 Online
Please see the URL below for details on the online seminar.
Haruhisa Enomoto (Osaka Prefecture University)
Exactcategorical properties of subcategories of abelian categories 1 (Japanese)
http://www.math.nagoyau.ac.jp/~aaron.chan/TNAseminar.html
Please see the URL below for details on the online seminar.
Haruhisa Enomoto (Osaka Prefecture University)
Exactcategorical properties of subcategories of abelian categories 1 (Japanese)
[ Abstract ]
Quillen's exact category is a powerful framework for studying extensionclosed subcategories of abelian categories, and provides many interesting questions on such subcategories.
In the first talk, I will explain the basics of some properties and invariants of exact categories (e.g. the JordanHolder property, simple objects, and Grothendieck monoid).
In the second talk, I will give some results and questions about particular classes of exact categories arising in the representation theory of algebras (e.g. torsion(free) classes over path algebras and preprojective algebras).
If time permits, I will discuss questions of whether these results can be generalized to extriangulated categories (extensionclosed subcategories of triangulated categories).
[ Reference URL ]Quillen's exact category is a powerful framework for studying extensionclosed subcategories of abelian categories, and provides many interesting questions on such subcategories.
In the first talk, I will explain the basics of some properties and invariants of exact categories (e.g. the JordanHolder property, simple objects, and Grothendieck monoid).
In the second talk, I will give some results and questions about particular classes of exact categories arising in the representation theory of algebras (e.g. torsion(free) classes over path algebras and preprojective algebras).
If time permits, I will discuss questions of whether these results can be generalized to extriangulated categories (extensionclosed subcategories of triangulated categories).
http://www.math.nagoyau.ac.jp/~aaron.chan/TNAseminar.html
Lie Groups and Representation Theory
17:0018:00 Room #On line (Graduate School of Math. Sci. Bldg.)
Hideyuki Ishi (Osaka City University)
Strongly visible actions on complex domains (Japanese)
Hideyuki Ishi (Osaka City University)
Strongly visible actions on complex domains (Japanese)
[ Abstract ]
In this century, the CartanHartogs domain and its variations, on which the Bergman kernel function and the KahlerEinstein metric can be computed explicitly, have been actively studied. Reasoning that strongly visible actions on the domains enable such nice calculations, we introduce a new type of complex domain analogous to the CartanHartogs domain, and present a research plan about harmonic analysis over the domain.
In this century, the CartanHartogs domain and its variations, on which the Bergman kernel function and the KahlerEinstein metric can be computed explicitly, have been actively studied. Reasoning that strongly visible actions on the domains enable such nice calculations, we introduce a new type of complex domain analogous to the CartanHartogs domain, and present a research plan about harmonic analysis over the domain.
2022/01/13
Information Mathematics Seminar
16:5018:35 Online
Keita Xagawa (NTT)
Latticebased cryptography and its applications (Japanese)
https://docs.google.com/forms/d/1WLEbsA2aQTXgdE2ynrumJOGZ4AVWqcOLCz42B4nPY
Keita Xagawa (NTT)
Latticebased cryptography and its applications (Japanese)
[ Abstract ]
Explanation on latticebased cryptography and its applications
[ Reference URL ]Explanation on latticebased cryptography and its applications
https://docs.google.com/forms/d/1WLEbsA2aQTXgdE2ynrumJOGZ4AVWqcOLCz42B4nPY
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