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The authors obtain the pairs of generators, necessary to study the non-orientable case, of the alternating groups $A_n$ for 21, 22, 28 and 29, which are also Hurwitz groups, groups with maximal number of automorphisms on Riemann surfaces[...]texto impreso
Analysis of variance with general errors and grouped and non-grouped data: Some iterative algorithms
In this paper we consider some iterative estimation algorithms, which are valid to analyse the variance of data, which may be either non-grouped or grouped with different classification intervals. This situation appears, for instance, when data [...]texto impreso
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The paper presents asymptotic distributions of phi-disparity goodness-of-fit statistics in product multinomial models, under hypotheses and alternatives assuming sparse and nonsparse cell frequencies. The phi-disparity statistics include the pow[...]texto impreso
Gallego Rodrigo, Francisco Javier ; González, Miguel ; Purnaprajna, Bangere P. | Academic Press | 2013-01his article delves into the relation between the deformation theory of finite morphisms to projective space and the existence of ropes, embedded in projective space, with certain invariants. We focus on the case of canonical double covers X of a[...]texto impreso
Batsidis, Apostolos ; Horvath, L. ; Martin, N. ; Pardo Llorente, Leandro ; Zografos, Konstantinos | Academic Press | 2013-07We propose two families of maximally selected phi-divergence tests to detect a change in the probability vectors of a sequence of multinomial random variables with possibly different sizes. In addition, the proposed statistics can be used to est[...]texto impreso
In this article we classify quadruple Galois canonical covers ? of singular surfaces of minimal degree. This complements the work done in [F.J. Gallego, B.P. Purnaprajna, Classification of quadruple Galois canonical covers, I, preprint, math.AG/[...]texto impreso
This paper shows a practical and easy to compute generalization of the linear dynamic model, made by assuming a continuous elliptical joint distribution for the parameters and errors. Updated distribution and probabilistic characteristics of the[...]texto impreso
Ancochea Bermúdez, José María ; Campoamor Stursberg, Otto Ruttwig ; García Vergnolle, Lucía ; Sánchez Hernández, J. | Academic Press | 2008-03-15On détermine les classes d’isomorphisme des algèbres de Jordan en dimension deux sur le corps des nombres réels. En utilisant des techniques d’Analyse Non Standard, on étudie les propriétés de la variét des lois d’algèbres de Jordan, et aussi le[...]texto impreso
In this note, the author proves, in the context of excellent rings, two results on chains of specializations in the real spectrum and some corollaries about real dimension. The first result (Theorem I) is the following: let ?0 be a point of Spec[...]texto impreso
Arrieta Algarra, José María ; Carvalho, Alexandre N. ; Lozada-Cruz, Germán | Academic Press | 2009-07-01In this work we continue the analysis of the asymptotic dynamics of reaction diffusion problems in a dumbbell domains started in [3]. Here we study the limiting problem, that is, an evolution problem in a \domain" which consists of an open, boun[...]texto impreso
Sánchez Elordi, Elena ; Díaz, Eva María ; Armas, Roberto de ; Santiago, Rocío ; Alarcón, Borja ; Vicente Córdoba, Carlos ; Legaz González, María Estrella | Academic Press | 2020-04-17The effects of different environmental stresses on growth, efficiency in biomass production, and on the accumulation of sucrose in sugarcane cultivars are studied. Thermal, nutritional, saline, and drought stresses have similar effects on sensit[...]texto impreso
Let X be a smooth complete complex toric variety such that the boundary is a simple normal crossing divisor, and let E be a holomorphic vector bundle on X. We prove that the following three statements are equivalent: The holomorphic vector bun[...]texto impreso
For each pair of numbers m, n epsilon N with m > n, we consider the norm on R-3 given by parallel to(a, b, c)parallel to m,n = sup{vertical bar ax(m) +bx(n) +C vertical bar: x epsilon [-1, 1]} for every (a, b, c) epsilon R-3. We investigate som[...]texto impreso
In this note, the author gives a proof of the following going-down theorem: If ?:A?B is a regular map between Noetherian rings with A excellent, any chain of specialization in Spec r A comes from a chain of the same length in Spec r B with corr[...]texto impreso
Jarchow , Hans ; Palazuelos Cabezón, Carlos ; Pérez García, David ; Villanueva, Ignacio | Academic Press | 2007-12-15The aim of this paper is to investigate close relations between the validity of Hahn–Banach extension theorems for multilinear forms on Banach spaces and summability properties of sequences from these spaces. A case of particular importance occu[...]texto impreso
Let W4=H0??H1??H2??H3?H4 be a handle decomposition of a closed, orientable PL 4-manifold. Let M4=H0??H1??H2 and let N4=N4(?)=?H3?H4=?#(S1×B3). Then W4 is M4?N4, identified along ?M4=?N4=?#(S1×S2). The first observation in this paper is that W4 d[...]texto impreso
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Lanteri, Antonio ; Mallavibarrena Martínez de Castro, Raquel ; Piene, Ragni | Academic Press | 2015-11-01Quadric flbrations over smooth curves are investigated with respect to their osculatory behavior. In particular, bounds for the dimensions of the osculating spaces are determined, and explicit formulas for the classes of the inflectional loci ar[...]texto impreso
Let (a(n)) be a weakly null Schauder basis of a Banach space E, and let (lambda(n)) be a convergent sequence of real numbers. We study the problem of finding an m-times weakly uniformly differentiable function f on E such that f(a(n)) = lambda(n[...]texto impreso
Lukes, J. ; Muñoz-Fernández, Gustavo A. ; Petracek, P. ; Seoane-Sepúlveda, Juan B. | Academic Press | 2016-11-15We study the algebraic and topological genericity of certain subsets of locally recurrent functions, obtaining (among other results) algebrability and spaceability within these classes.texto impreso
We study the poles of several local zeta functions: the Igusa, topological and motivic zeta function associated to a germ of a holomorphic function in two variables. It was known that there is at most one double pole for (any of) these zeta func[...]texto impreso
In this paper we consider categorical data that are distributed according to a multinomial, product-multinomial or Poisson distribution whose expected values follow a log-linear model and we study the inference problem of hypothesis testing in a[...]texto impreso
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Marivaux, L. ; Aguirre-Diaz, W. ; Benites-Palomino, A. ; Billet, G. ; Boivin, M. ; Pujos, F. ; Salas-Gismondi, R. ; Tejada-Lara, J.V. ; Varas-Malca, R.M. ; Antoine, P.-O. | Academic Press | 2020-12-14T16:06:31ZThe Honda Group of La Venta, Colombia, has yielded a wide array of crown platyrrhine primates, documenting the late Middle Miocene epoch (ca. 13.1–12.6 Ma, Laventan South American Land Mammal Age). Although exceptional, this record represents on[...]texto impreso
From the introduction: Let X be an irreducible projective variety and L a very ample lLine bundle on X, whose complete linear series defines 'L : X ! P(H0(L)). Let S = 1 m=0 SmH0(X,L) and let R(L) = L1 n=0 H0(X,L n) be the homogeneous coordinate[...]texto impreso
This paper investigates a new family of statistics based on Burbea-Rao divergence for testing goodness-of-fit. Under the simple and composite null hypotheses the asymptotic distribution of these tests is shown to be chi-squared. For composite hy[...]texto impreso
After having given the classification of solvable rigid Lie algebras of low dimensions, we study the general case concerning rigid Lie algebras whose nilradical is filiform and present their classification.texto impreso
We show that the Pythagoras number of a real analytic ring of dimension 2 is finite, bounded by a function of the multiplicity and the codimension.texto impreso
We show that, for every orthogonally additive homogeneous polynomial P on a space of continuous functions C(K) with values in a Banach space Y, there exists a linear operator S : C(K) -> Y such that P(f) = S(f(n)). This is the C(K) version of a[...]texto impreso
In this paper we extend the classical notion of offset to the concept of generalized offset to hypersurfaces. In addition, we present a complete theoretical analysis of the rationality and unirationality of generalized offsets. Characterizations[...]texto impreso
Menéndez Calleja, María Luisa ; Pardo Llorente, Leandro ; Pardo Llorente, María del Carmen | Academic Press | 2008-11We consider the problem of estimation of the parameters in Generalized Linear Models (GLM) with binary data when it is suspected that the parameter vector obeys some exact linear restrictions which are linearly independent with some degree of un[...]texto impreso
Let k be a real closed field. A real curve germ over k is a real one-dimensional Noetherian local integral domain with residual field k. A Noetherian local ring A with maximal ideal m and completion  is an AP-ring if for every system of polynom[...]texto impreso
We show how Lasry-Lions's result on regularization of functions defined on R-n or on Hilbert spaces by sup inf convolutions with squares of distances can be extended to (finite or infinite dimensional) Riemannian manifolds M of bounded sectional[...]texto impreso
Azagra Rueda, Daniel ; Muñoz-Fernández, Gustavo A. ; Seoane-Sepúlveda, Juan B. ; Sánchez de los Reyes, Víctor Manuel | Academic Press | 2009-06If f is continuous on the interval [a, b], g is Riemann integrable (resp. Lebesgue measurable) on the interval [alpha, beta] and g([alpha, beta]) subset of [a, b], then f o g is Riemann integrable (resp. measurable) on [alpha, beta]. A well-know[...]texto impreso
Gómez Villegas, Miguel A. ; Gómez Sánchez-Manzano, Eusebio ; Marín Diazaraque, Juan Miguel | Academic Press | 2006-02Two conditions are shown under which elliptical distributions are scale mixtures of normal distributions with respect to probability distributions. The issue of finding the mixing distribution function is also considered. As a unified theoretica[...]texto impreso
Pérez, A. ; Machado, W. ; Gutierrez, D. ; Saldarriaga, M.S. ; Sanders, C.J. | Academic Press | 2020-12-14T16:10:04ZIn order to investigate the influence of shrimp farming activities on carbon and nutrient accumulation, sediment cores were collected from two areas at different distances from shrimp farms within a Peruvian mangrove ecosystem. In both areas two[...]texto impreso
The author shows there is a non-Archimedean ordering of the field R(x, y), where x and y are algebraically independent over K, for which the identity is the only order-preserving automorphism. The author proves the partly known result that the f[...]texto impreso
The paper deals with simple and composite hypotheses in statistical models with i.i.d. observations and with arbitrary families dominated by a finite measures and parametrized by vector-valued variables. It introduces phi-divergence testing stat[...]texto impreso
Let k be a real closed field. A real AP-curve (over k) is a 1-dimensional, excellent Henselian local real domain with residue field k. A 1-dimensional Noetherian local ring is Arf, if emb dim(B)=mult(B) for every local ring B infinitely near to [...]texto impreso
We clarify a difficulty that appears in [R. Quarez, J. Algebra 238 (2001) 139] to bound the Pythagoras number of a real irreducible algebroid curve by its multiplicity.texto impreso
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Ursoniu, Sorin ; Mikhailidis, Dimitri P. ; Serban, Maria-Corina ; Penson, Peter ; Toth, Peter P. ; Ridker, Paul M. ; Ray, Kausik K. ; Kees Hovingh, G. ; Kastelein, John J. ; Hernandez, Adrian V. ; Manson, JoAnn E. ; Rysz, Jacek ; Banach, Maciej | Academic Press | 2017-10-22T17:40:31ZEl texto completo de este trabajo no está disponible en el Repositorio Académico UPC por restricciones de la casa editorial donde ha sido publicado. El texto completo de este trabajo no está disponible en el Repositorio Académico UPC por restric[...]texto impreso
Sánchez Bretaño, Aída ; Alonso Gómez, Ángel Luis ; Delgado Saavedra, María Jesús ; Isorna Alonso, Esther | Academic Press | 2015-09The circadian system drives daily physiological and behavioral rhythms that allow animals to anticipate cyclic environmental changes. The discovery of the known as ‘‘clock genes’’, which are very well conserved through vertebrate phylogeny, high[...]texto impreso
Every finite group G acts as an automorphism group of several bordered compact Klein surfaces. The minimal genus of these surfaces is called the real genus and denoted by ?(G). The systematical study was begun by C.L. May and continued by him in[...]texto impreso
Let F be a number field, Suppose x, y ? F* have the property that for all n ? Z and almost all prime ideals p of the ring of integers of F* one has that yn =1 (mod p) whenever xn=1 (mod p). We show that then y is a power of x. This answers a que[...]texto impreso
We prove the existence of a periodic solution to the problem u(t) - Delta(p)u + R-e(x,u) is an element of mu Q(x,t)beta(u) in M x R, assumed p greater than or equal to 2, M a compact connected and oriented bidimensional Riemannian manifold witho[...]texto impreso
It is a famous result due to G. Horrocks [Proc. Lond. Math. Soc. (3) 14, 689-713 (1964; Zbl 0126.16801)] that line bundles on a projective space are the only indecomposable vector bundles without intermediate cohomology. This fact generalizes to[...]