Results 21 to 30 of about 12,776,695 (181)
Umbral Methods, Combinatorial Identities and Harmonic Numbers
Journal Applied Mathematics, 2012 We analyse and demonstrate how umbral methods can be applied for the study of the problems, involving combinatorial calculus and harmonic numbers. We demonstrate their efficiency and we find the general procedure to frame new and existent identities within a unified framework, amenable of further generalizations.
K. V. Zhukovsky, G. Dattoli
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The umbral symbolic method for supersymmetric tensors
Advances in Mathematics, 1992 The problem of finding a unified and effective symbolic method for both symmetric and skew-symmetric tensors remained unsolved until the publication of \textit{F. D. Grosshans}, \textit{G.-C. Rota} and \textit{J. A. Stein's} book [Invariant theory and superalgebras (1987; Zbl 0648.15020)].
Brini, Andrea +2 more
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Operator Ordering and Solution of Pseudo-Evolutionary Equations
Axioms, 2019 The solution of pseudo initial value differential equations, either ordinary or partial (including those of fractional nature), requires the development of adequate analytical methods, complementing those well established in the ordinary differential ...
Nicolas Behr +2 more
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Modelando crecimiento y rentabilidad empresarial de la industria de Coahuila
Ensayos Revista de Economía, 2023 Se analiza la relación crecimiento-rentabilidad de la manufactura de Coahuila, México, durante 1993-2018. La actividad empresarial es uno de los motores generadores de empleo que suele estar subordinada a la rentabilidad.
Vicente Germán-Soto +1 more
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Umbral methods and operator ordering
, 2011 By using methods of umbral nature, we discuss new rules concerning the operator ordering. We apply the technique of formal power series to take advantage from the wealth of properties of the exponential operators. The usefulness of the obtained results in quantum field theory is discussed.
Babusci, D., Dattoli, G.
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Q-functions and distributions, operational and umbral methods
Mathematics, 2021 Silvia Licciardi
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Los políticos de Umbral: retratos poéticos y antipoéticos [PDF]
, 2015 This article addresses the use of poetic features in Francisco Umbral’s work by analysing his portraits of politicians. Although Umbral was not strictly speaking a poet, his texts were written in a very poetic manner, and this can be seen in those ...
Laín Corona, Guillermo
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Generalised umbral moonshine [PDF]
, 2019 Umbral moonshine describes an unexpected relation between 23 finite groups arising from lattice symmetries and special mock modular forms. It includes the Mathieu moonshine as a special case and can itself be viewed as an example of the more general ...
Cheng, M.C.N. +2 more
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The Umbral Transfer-Matrix Method. I. Foundations
Journal of Combinatorial Theory, Series A, 2000 In this paper the author lays the foundation for the umbral transfer-matrix method based on G. C. Rota's realization of an umbra, merely a linear functional on a vector space of formal power series. It appears to be the first in a series of papers to be written by the author aiming to show how Rota's concept blended with the transfer-matrix method ...
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Downflowing umbral flashes as evidence of standing waves in sunspot umbrae
, 2021 Context. Umbral flashes are sudden brightenings commonly visible in the core of some chromospheric lines. Theoretical and numerical modeling suggests that they are produced by the propagation of shock waves.
T. Felipe +11 more
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