Results 171 to 180 of about 27,700 (212)

Occupational exposure to ionizing radiation in pregnant staff. Consensus document of ACI-SEC/ARC-SEC/SERVEI/SENR/SERAM/GeNI. [PDF]

REC Interv Cardiol
Velázquez Martín M, Lojo Lendoiro S, Soto Flores N, Jiménez Gómez E, Abadal Villayandre JM, Datino T, Navia Álvarez P, González Díaz EM, Bargalló Alabart N, Bastante Valiente T, Arzamendi Aizpurua D, Martín Moreiras J, Cid Álvarez B.   +12 more
europepmc   +1 more source

[Esophageal perforation: surgical outcomes in a referral center]. [PDF]

Rev Med Inst Mex Seguro Soc
Vera-Bernal JA, Beristain-Hernande JL, Rosas-Espinoza LA, García-Sánchez M, Bevia-Pérez F, Guerrero-Rebaja G, Regalado-Aquino A, Rivera-Martinez JC, García-Meza A.   +8 more
europepmc   +1 more source

Umbral and the poetry

Arbor: Ciencia, Pensamiento y Cultura, 2015
Díez, J. Ignacio, Martínez Rico, Eduardo   +1 more
openaire   +1 more source

Baxter Algebras and the Umbral Calculus [PDF]

Advances in Applied Mathematics, 2001
This papers aims to unite two mathematical areas championed by G.-C. Rota: umbral calculus and Baxter algebras. The umbral calculus refers to algebraic combinatorics of sequences of polynomials of binomial type and other related sequences. Rota showed how this is encapsulated by a certain `umbral algebra' consisting of linear functionals on these ...
Li Guo
exaly   +5 more sources

Umbral “classical” polynomials

Journal of Mathematical Analysis and Applications, 2014
We study the umbral "classical" orthogonal polynomials with respect to a generalized derivative operator $\cal D$ which acts on monomials as ${\cal D} x^n = μ_n x^{n-1}$ with some coefficients $μ_n$. Let $P_n(x)$ be a set of orthogonal polynomials. Define the new polynomials $Q_n(x) =μ_{n+1}^{-1}{\cal D} P_{n+1}(x)$.
Alexei Zhedanov
exaly   +3 more sources

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The Classical Umbral Calculus

SIAM Journal on Mathematical Analysis, 1994
In this paper the authors, Rota and Taylor, present a simple and rigorous treatment of umbral calculus which has been discussed in the past, among others, by J. Blissard, E. T. Bell, and J. Riordan. The basic construct here is a polynomial ring in several variables, on which no less than three equivalence relations are defined.
Rota, G.-C., Taylor, B. D.
exaly   +2 more sources

Umbrales paradójicos

Tópicos del Seminario, 2016
Al circunscribir el enfoque de este artículo a la paradoja en los discursos, se propone dos linajes de pensadores que atraviesan la historia occidental: unos, manipulan y refutan artefactos paradójicos relacionados con metalenguajes conceptuales, lógicos y científicos; otros, vuelcan en su discurso flujos aporéticos que testimonian no sólo el ...
openaire   +1 more source