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of 282
pro vyhledávání: '"Hasegawa, Kei"'
In this note, we introduce and study a notion of bi-exactness for creation operators acting on full, symmetric and anti-symmetric Fock spaces. This is a generalization of our previous work, in which we studied the case of anti-symmetric Fock spaces.
Externí odkaz:
http://arxiv.org/abs/2101.10592
Let $ G $ be a countable discrete group and consider a nonsingular Bernoulli shift action $ G \curvearrowright \prod_{g\in G }(\{0,1\},\mu_g)$ with two base points. When $ G $ is exact, under a certain finiteness assumption on the measures $\{\mu_g\}
Externí odkaz:
http://arxiv.org/abs/2010.03117
Autor:
Okubo, Tatsuya, Shimizu, Teruyuki, Hasegawa, Kei, Kikuchi, Yasunori, Manzhos, Sergei, Ihara, Manabu
Publikováno v:
In Energy 15 April 2023 269
Autor:
Hasegawa, Kei, Ueda, Yoshimichi
Publikováno v:
Math. Proc. Royal Irish Acad., Vol.119A, No.1 (2019), 1--5
This short note aims to give an insight to Arveson's boundary theorem by means of non-commutative Poisson boundaries and its applications.
Comment: 4 pages
Comment: 4 pages
Externí odkaz:
http://arxiv.org/abs/1810.10689
We introduce new numerical integration operators which compose the mass and stiffness matrices of a modified spectral element method for simulation of elastic wave propagation. While these operators use the same quadrature nodes as does the original
Externí odkaz:
http://arxiv.org/abs/1801.02829
Autor:
Hasegawa, Kei
For any reduced free product $\mathrm{C}^*$-algebra $(A, \varphi) =(A_1, \varphi_1) \star (A_2, \varphi_2)$, we prove a boundary rigidity result for the embedding of $A$ into its associated $\mathrm{C}^*$-algebra $\Delta \mathbf{T}(A, \varphi)$. This
Externí odkaz:
http://arxiv.org/abs/1708.08260
Autor:
Hasegawa, Kei
For any reduced amalgamated free product $\mathrm{C}^*$-algebra $(A,E)=(A_1, E_1) \ast_D (A_2,E_2)$, we introduce and study a canonical ambient $\mathrm{C}^*$-algebra $\Delta\mathbf{T}(A,E)$ of $A$ which generalizes the crossed product arising from t
Externí odkaz:
http://arxiv.org/abs/1609.08837
Autor:
Hasegawa, Kei
We prove that any reduced amalgamated free product C*-algebra is KK-equivalent to the corresponding full amalgamated free product C*-algebra. The main ingredient of its proof is Julg--Valette's geometric construction of Fredholm modules with Connes's
Externí odkaz:
http://arxiv.org/abs/1510.02061
Autor:
Hasegawa, Kei
We prove a relative analogue of equivalence between nuclearity and CPAP. In its proof, the notion of weak containment for C$^*$-correspondences plays an important role. As an application we prove $KK$-equivalence between full and reduced amalgamated
Externí odkaz:
http://arxiv.org/abs/1503.03353
Autor:
Hasegawa, Kei
Publikováno v:
Can. Math. Bull. 58 (2015) 91-104
Let $\alpha:G \curvearrowright M$ be a spatial action of countable abelian group on a "spatial" von Neumann algebra $M$ and $S$ be its unital subsemigroup with $G=S^{-1}S$. We explicitly compute the essential commutant and the essential fixed-points,
Externí odkaz:
http://arxiv.org/abs/1404.3830