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The irreducible tensor operators and their tensor products employing Racah algebra are studied. Transformation procedure of the coordinate system operators act on are introduced. The rotation matrices and their parametrization by the…

Mathematical Physics · Physics 2015-05-18 R. Jursenas , G. Merkelis

In this paper, we present some interesting results to characterize the Moore-Penrose inverses of unbounded closable operators and the Cartesian product of closed operators in Hilbert spaces.

Functional Analysis · Mathematics 2024-05-21 Arup Majumdar , P. Sam Johnson

The paper presents a model-independent, nonperturbative proof of operator product expansions in quantum field theory. As an input, a recently proposed phase space condition is used that allows a precise description of point field…

Mathematical Physics · Physics 2007-11-27 Henning Bostelmann

We provide a characterization of the commutant of analytic Toeplitz operators $T_B$ induced by finite Blachke products $B$ acting on weighted Bergman spaces which, as a particular instance, yields the case $B(z)=z^n$ on the Bergman space…

Functional Analysis · Mathematics 2022-06-01 Eva A. Gallardo-Gutiérrez , Jonathan R. Partington

We first formulate a definition of tensor product for two modules for a vertex operator algebra in terms of a certain universal property and then we give a construction of tensor products. We prove the unital property of the adjoint module…

High Energy Physics - Theory · Physics 2009-09-25 Hai-sheng Li

We investigate algebraic and topological transitivity and, more generally, k-transitivity for linear spaces of operators. In finite dimensions, we determine minimal dimensions of k-transitive spaces for every k, and find relations between…

Operator Algebras · Mathematics 2007-06-19 K. R. Davidson , L. W. Marcoux , H. Radjavi

It is shown how the results in the theory of determinants and traces as well as in the theory of quasi-normed tensor products can be applied for getting new theorems on distribution of eigenvalues of nuclear operators in Banach spaces and…

Functional Analysis · Mathematics 2023-08-24 Oleg I. Reinov

We construct an explicit abelian model for the operation of tensor $2$-product of $2$-representations of $\mathfrak{sl}_{2}^{+}$, specifically the product of a simple $2$-representation $\mathcal{L}(1)$ with a given abelian…

Representation Theory · Mathematics 2023-06-23 Matthew McMillan

In this paper we investigate intertwining relations for compressions of $k^{th}$--order slant Toeplitz operators to model spaces. We then ask when a product of two such compressions is a compression itself.

Functional Analysis · Mathematics 2023-06-13 Bartosz Łanucha , Małgorzata Michalska

The Fubini product of operator spaces provide a powerful tool for analysing properties of tensor products. In this paper we review the the theory of Fubini products and apply it to the problem of computing invariant parts of dynamical…

Operator Algebras · Mathematics 2016-03-16 Otgonbayar Uuye , Joachim Zacharias

In this paper we provide two characterizations of the maximal tensor product structure for the category of operator systems. The first one is via the schur tensor product; the second one employs the idea of the completely positive…

Operator Algebras · Mathematics 2015-03-25 Wai Hin Ng

We review progress on the generalized Witten conjecture and some of its major ingredients. This conjecture states that certain intersection numbers on the moduli space of higher spin curves assemble into the logarithm of the tau function of…

Algebraic Geometry · Mathematics 2007-05-23 Tyler J. Jarvis , Takashi Kimura , Arkady Vaintrob

We define and study a lift of the Boardman-Vogt tensor product of operads to bimodules over operads.

Algebraic Topology · Mathematics 2013-02-18 William Dwyer , Kathryn Hess

In this lecture, we present some results on Gaussian (or Rademacher) random series of trace class operators, mainly due jointly with F. Lust-Piquard. We will emphasize the probabilistic reformulation of these results, as well as the open…

Functional Analysis · Mathematics 2011-03-11 Gilles Pisier

The main result of this paper is a bi-parameter T(b) theorem for the case that b is a tensor product of two pseudo-accretive functions. In the proof, we also discuss the L^2 boundedness of different types of the b-adapted bi-parameter…

Classical Analysis and ODEs · Mathematics 2013-05-09 Yumeng Ou

This is the sixth part in a series of papers in which we introduce and develop a natural, general tensor category theory for suitable module categories for a vertex (operator) algebra. In this paper (Part VI), we construct the appropriate…

Quantum Algebra · Mathematics 2012-05-14 Yi-Zhi Huang , James Lepowsky , Lin Zhang

A convenient technique for calculating completed topological tensor products of functional Frechet and DF spaces is developed. The general construction is applied to proving kernel theorems for a wide class of spaces of smooth and entire…

Functional Analysis · Mathematics 2009-03-06 A. G. Smirnov

We prove a complex interpolation formula for the injective tensor product of vector-valued Banach function spaces satisfying certain geometric assumptions. This result unifies results of Kouba, and moreover, our approach offers an alternate…

Functional Analysis · Mathematics 2007-05-23 Andreas Defant , Carsten Michels

We study idempotent analogs of topological tensor products in the sense of A. Grothendieck. The basic concepts and results are simulated on the algebraic level. This is one of a series of papers on idempotent functional analysis.

Functional Analysis · Mathematics 2007-05-23 Grigori Litvinov , Viktor Maslov , Grigori Shpiz

In the present paper, we introduce new tensor Krylov subspace methods for solving linear tensor equations. The proposed methods use the well known T-product for tensors and tensor subspaces related to tube fibers. We introduce some new…

Numerical Analysis · Mathematics 2021-03-02 A. El Ichi , K. Jbilou , R. Sadaka