نتایج جستجو برای: lankford coefficients

تعداد نتایج: 105336  

1997
Piotr Kosinski

We reconsider the quasi exactly solvable matrix models constructed recently by R. Zhdanov. The 2×2 matrix operators representing the algebra sl(2) are generalized to matrices of arbitrary dimension and a similar construction is achieved for the algebra sl(n). ∗† Work supported by grant no KBN 2P03B07610 1. Recently Zhdanov [1],[2] considered the realizations of the sl(2) algebra in terms of fir...

2009
HJALMAR ROSENGREN

Dynamical quantum groups were recently introduced by Etingof and Varchenko as an algebraic framework for studying the dynamical Yang–Baxter equation, which is precisely the Yang–Baxter equation satisfied by 6j-symbols. We investigate one of the simplest examples, generalizing the standard SU(2) quantum group. The matrix elements for its corepresentations are identified with Askey–Wilson polynom...

2006
Hariharan Narayanan

Kostka numbers and Littlewood-Richardson coefficients play an essential role in the representation theory of the symmetric groups and the special linear groups. There has been a significant amount of interest in their computation ([1], [10], [11], [2], [3]). The issue of their computational complexity has been a question of folklore, but was asked explicitly by E. Rassart [10]. We prove that th...

2001
Paul O’Hara

There appear to be two standard ways of calculation C-G coefficients in quantum mechanics. One method is to combine the “ladder” operator approach with orthogonality conditions. The second method is to use some type of closed form [2] which allows the coefficients to be calculated directly. However, the latter approach is at times considered “tedious” [2] and does not reveal any new information...

1999
JAMES D. LOUCK

An expression for the kth power of an n×n determinant in n2 indeterminates (zij) is given as a sum of monomials. Two applications of this expression are given: the first is the Regge generating function for the Clebsch-Gordan coefficients of the unitary group SU (2), noting also the relation to the 3F2 hypergeometric series; the second is to the even powers of the Vandermonde determinant, or, e...

2008
D. Marinucci G. Peccati

We characterize the angular polyspectra, of arbitrary order, associated with isotropic fields defined on the sphere S 2 = ˘ (x, y, z) : x 2 + y 2 + z 2 = 1 ¯. Our techniques rely heavily on group representation theory, and specifically on the properties of Wigner matrices and Clebsch-Gordan coefficients. The findings of the present paper constitute a basis upon which one can build formal proced...

2004
DANIEL S. SAGE

Typically, physical properties of composite materials are strongly dependent on the microstructure. However, in exceptional situations, there exists exact formulas for the effective properties of composites which are microstructure-independent. These formulas represent fundamental physical invariances. The classical approach to exact relations suffered from the drawback that the methods used we...

2015
Winfried Just Hannah Callender M. Drew LaMar

Press New to initialize a next-generation SIR-model on a network GReg(200, 4) with one index case in an otherwise susceptible population. Press Metrics to verify that R0 = 2. By the result of our module The replacement number at this website we should have Rst t ≈ 1.5 > 1 for sufficiently small positive t. Thus we would expect to see a significant proportion of major outbreaks in addition to so...

Journal: :iranian journal of pathology 0
masoumeh heidari dept of midwifery, shahed university, tehran, iran zeinab safavi aster of knowledge and information science, jadda public library, tehran, iran

background and objective: co-authorship on writing articles is one of the indicators of reliability in scientific articles. due to the lack of information regarding to the rate of participation of the authors of articles in the ” iranian journal of pathology” this research with the aim of the survey of collaborative coefficients of article authors in this journal  from 2006 to 2012 was performe...

2018
Risi Kondor

We describe N–body networks, a neural network architecture for learning the behavior and properties of complex many body physical systems. Our specific application is to learn atomic potential energy surfaces for use in molecular dynamics simulations. Our architecture is novel in that (a) it is based on a hierarchical decomposition of the many body system into subsytems (b) the activations of t...

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