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1,055 results on '"Ferrer, Maria"'

1. Groups with few finite dimensional unitary representations

Author

Ferrer, María V. and Hernández, S.

Subjects
Mathematics - Group Theory, Mathematics - General Topology, Mathematics - Representation Theory
Abstract

The \emph{Bohr compactification} of an arbitrary topological group $G$ is defined as the group compactification $(bG,b)$ with the following universal property: for every continuous homomorphism $h$ from $G$ into a compact group $K$ there is a continuous homomorphism $h^{b}$ from $bG$ into $K$ extending $h$ in the sense that $h=h^b \circ b$. The Bohr compactification $(bG,b)$ is the unique (up to equivalence) largest compactification of $G$. Although, for locally compact Abelian groups, the Bohr compactification is a big monster, for non-Abelian groups the situation is much more interesting and it can be said that all options are possible. Here we are interested in locally compact groups whose Bohr compactification is \emph{small}. Among other results, we characterize when the Bohr the Bohr compactification of a locally compact group is topologically isomorphic to its Chu or unitary quasi-dual. Our results fixe some incorrect statements appeared in the literature.

Published
2024

2. Tensor products of topological abelian groups and Pontryagin duality

Author

Ferrer, María V., Hernández-Arzusa, Julio, and Hernández, Salvador

Subjects
Mathematics - Functional Analysis, Mathematics - General Topology, Mathematics - Group Theory, 22A05 (22A25 22E99 20C15 20K20 54H11
Abstract

Let $G$ be the group of all $\ZZ$-valued homomorphisms of the Baer-Specker group $\ZZ^\NN$. The group $G$ is algebraically isomorphic to $\ZZ^{(\NN)}$, the infinite direct sum of the group of integers, and equipped with the topology of pointwise convergence on $\ZZ^\NN$, becomes a non reflexive prodiscrete group. It was an open question to find its dual group $\hat{G}$. Here, we answer this question by proving that $\hat{G}$ is topologically isomorphic to $\ZZ^\NN\otimes_\mathcal{Q}\TT$, the (locally quasi-convex) tensor product of $\ZZ^\NN$ and $\TT$. Furthermore, we investigate the reflexivity properties of the groups of $C_p(X,\ZZ)$, the group of all $\ZZ$-valued continuous functions on $X$ equipped with the pointwise convergence topology, and $A_p(X)$, the free abelian group on a $0$-dimensional space $X$ equipped with the topology $t_p(C(X,\ZZ))$ of pointwise convergence topology on $C(X,\ZZ)$. In particular, we prove that $\hat{A_p(X)}\simeq C_p(X,\ZZ)\otimes_\mathcal{Q}\TT$ and we establish the existence of $0$-dimensional spaces $X$ such that $C_p(X,\ZZ)$ is Pontryagin reflexive.

Published
2023

3. Role of lateral suspension for the treatment of pelvic organ prolapse: a Delphi survey of expert panel

Author

Simoncini, Tommaso, Panattoni, Andrea, Cadenbach-Blome, Tina, Caiazzo, Nicola, García, Maribel Calero, Caretto, Marta, Chun, Fu, Francescangeli, Eric, Gaia, Giorgia, Giannini, Andrea, Hegenscheid, Lucas, Luisi, Stefano, Mannella, Paolo, Mereu, Liliana, Montt-Guevara, Maria Magdalena, Ñiguez, Isabel, Ritter, Ratiba, Russo, Eleonora, Ferrer, Maria Luisa Sanchez, Tammaa, Ayman, Uhl, Bernhard, Wiedemann, Bea, Wilczak, Maciej, Pauli, Friedrich, and Dubuisson, Jean

Published
2024
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5. Introduction

Author

Moreno-Luzón, Javier, Nagore-Ferrer, María, Lumsden, Paul, Series Editor, Katz Montiel, Marco, Series Editor, Moreno-Luzón, Javier, editor, and Nagore-Ferrer, María, editor

Published
2024
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8. Adiabatic Passage through Level Anticrossings in Systems of Chemically Inequivalent Protons Incorporating Parahydrogen: Theory, Experiment, and Prospective Applications

Author

Ferrer, Maria-Jose, Kuker, Erin L, Semenova, Evgeniya, Gangano, Anghelo Josh, Lapak, Michelle P, Grenning, Alexander J, Dong, Vy M, and Bowers, Clifford R

Subjects
Protons, Hydrogen, Magnetic Resonance Spectroscopy, Magnetic Resonance Imaging, Pyruvic Acid, Chemical Sciences, General Chemistry
Abstract

Level anticrossings (LACs) are ubiquitous in quantum systems and have been exploited for spin-order transfer in hyperpolarized nuclear magnetic resonance spectroscopy. This paper examines the manifestations of adiabatic passage through a specific type of LAC found in homonuclear systems of chemically inequivalent coupled protons incorporating parahydrogen (pH2). Adiabatic passage through such a LAC is shown to elicit translation of the pH2 spin order. As an example, with prospective applications in biomedicine, proton spin polarizations of at least 19.8 ± 2.6% on the methylene protons and 68.7 ± 0.5% on the vinylic protons of selectively deuterated allyl pyruvate ester are demonstrated experimentally. After ultrasonic spray injection of a precursor solution containing propargyl pyruvate and a dissolved Rh catalyst into a chamber pressurized with 99% para-enriched H2, the products are collected and transported to a high magnetic field for NMR detection. The LAC-mediated hyperpolarization of the methylene protons is significant because of the stronger spin coupling to the pyruvate carbonyl 13C, setting up an ideal initial condition for subsequent coherence transfer by selective INEPT. Furthermore, the selective deuteration of the propargyl side arm increases the efficiency and polarization level. LAC-mediated translation of parahydrogen spin order completes the first step toward a new and highly efficient route for the 13C NMR signal enhancement of pyruvate via side-arm hydrogenation with parahydrogen.

Published
2022

9. Homomorphic encoders of profinite abelian groups II

Author

Ferrer, María V. and Hernández, Salvador

Subjects
Mathematics - General Topology, Computer Science - Information Theory, Mathematics - Group Theory
Abstract

Let $\{G_i :i\in\N\}$ be a family of finite Abelian groups. We say that a subgroup $G\leq \prod\limits_{i\in \N}G_i$ is \emph{order controllable} if for every $i\in \mathbb{N}$ there is $n_i\in \mathbb{N}$ such that for each $c\in G$, there exists $c_1\in G$ satisfying that $c_{1|[1,i]}=c_{|[1,i]}$, $supp (c_1)\subseteq [1,n_i]$, and order$(c_1)$ divides order$(c_{|[1,n_i]})$. In this paper we investigate the structure of order controllable group codes. It is proved that if $G$ is an order controllable, shift invariant, group code over a finite abelian group $H$, then $G$ possesses a finite canonical generating set. Furthermore, our construction also yields that $G$ is algebraically conjugate to a full group shift., Comment: Portions of this work previously appeared as arXiv:2103.13135, which has been split

Published
2021

13. The weak compactification of locally compact groups

Author

Ferrer, María V. and Hernández, Salvador

Subjects
Mathematics - General Topology, Mathematics - Functional Analysis, Locally compact group, Weak topology, Weak compactification, Bohr compactification
Abstract

We further investigate the weak topology generated by the irreducible unitary representations of a group $G$. A deep result due to Ernest \cite{Ernest1971} and Hughes \cite{Hughes1973} asserts that every weakly compact subset of a locally compact (LC) group $G$ is compact in the LC-topology, generalizing thereby a previous result of Glicksberg \cite{glicks1962} for abelian locally compact (LCA) groups. Here, we first survey some recent findings on the weak topology and establish some new results about the preservation of several compact-like properties when going from the weak topology to the original topology of LC groups. Among others, we deal with the preservation of countably compactness, pseudocompactness and functional boundedness., Comment: arXiv admin note: text overlap with arXiv:1704.03438

Published
2021

14. Staphylococcus aureus surgical site infection rates in 5 European countries

Author

Mellinghoff, Sibylle C., Bruns, Caroline, Albertsmeier, Markus, Ankert, Juliane, Bernard, Louis, Budin, Sofia, Bataille, Camille, Classen, Annika Y., Cornely, Florian B., Couvé-Deacon, Elodie, Fernandez Ferrer, Maria, Fortún, Jesús, Galar, Alicia, Grill, Eva, Guimard, Thomas, Hampl, Jürgen A., Wingen-Heimann, Sebastian, Horcajada, Juan P., Köhler, Felix, Koll, Carolin, Mollar, Joan, Muñoz, Patricia, Pletz, Mathias W., Rutz, Jule, Salmanton-García, Jon, Seifert, Harald, Serracino-Inglott, Ferdinand, Soriano, Alex, Stemler, Jannik, Vehreschild, Janne J., Vilz, Tim O., Naendrup, Jan-Hendrik, Cornely, Oliver A., and Liss, Blasius J.

Published
2023
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15. Role of Hormones During Gestation and Early Development: Pathways Involved in Developmental Programming

Author

Abruzzese, Giselle Adriana, Arbocco, Fiorella Campo Verde, Ferrer, María José, Silva, Aimé Florencia, Motta, Alicia Beatriz, Crusio, Wim E., Series Editor, Dong, Haidong, Series Editor, Radeke, Heinfried H., Series Editor, Rezaei, Nima, Series Editor, Steinlein, Ortrud, Series Editor, Xiao, Junjie, Series Editor, and Gonzalez-Ortiz, Marcelo, editor

Published
2023
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16. Impact of gender on in-hospital and long-term outcomes after transcatheter aortic valve implantation: an analysis of the Spanish TAVI registry

Author

Gabani, Rami, Brugaletta, Salvatore, Bujak, Kamil, Pèrez-Vizcayno, María José, Jiménez-Quevedo, Pilar, Arévalos, Víctor, Muñoz-García, Erika, Trillo-Nouche, Ramiro, del Valle, Raquel, de la Torre Hernández, José M., Salido, Luisa, Gutiérrez, Enrique, Pan, Manuel, Sánchez-Gila, Joaquín, García del Blanco, Bruno, Moreno, Raúl, Blanco Mata, Roberto, Oteo, Juan Francisco, Amat-Santos, Ignacio, Regueiro, Ander, Ten, Francisco, Nogales, Juan Manuel, Fernández-Nofrerías, Eduard, Andraka, Leire, Ferrer, María Cruz, Pinar, Eduardo, Romaguera, Rafael, Cuellas Ramón, Carlos, Alfonso, Fernando, García-Blas, Sergio, Piñero, Antonio, Ignasi, Julia, Díaz Mèndez, Rocío, Bordes, Pascual, Meseguer, Juan, Nombela-Franco, Luis, and Sabaté, Manel

Published
2024
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17. Impacto del sexo en los resultados hospitalarios y a largo plazo tras el implante percutáneo de válvula aórtica: un análisis del registro español de TAVI

Author

Gabani, Rami, Brugaletta, Salvatore, Bujak, Kamil, Pèrez-Vizcayno, María José, Jiménez-Quevedo, Pilar, Arévalos, Víctor, Muñoz-García, Erika, Trillo-Nouche, Ramiro, del Valle, Raquel, de la Torre Hernández, José M., Salido, Luisa, Gutiérrez, Enrique, Pan, Manuel, Sánchez-Gila, Joaquín, García del Blanco, Bruno, Moreno, Raúl, Blanco Mata, Roberto, Oteo, Juan Francisco, Amat-Santos, Ignacio, Regueiro, Ander, Ten, Francisco, Nogales, Juan Manuel, Fernández-Nofrerías, Eduard, Andraka, Leire, Ferrer, María Cruz, Pinar, Eduardo, Romaguera, Rafael, Cuellas Ramón, Carlos, Alfonso, Fernando, García-Blas, Sergio, Piñero, Antonio, Ignasi, Julia, Díaz Mèndez, Rocío, Bordes, Pascual, Meseguer, Juan, Nombela-Franco, Luis, and Sabaté, Manel

Published
2024
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27. On the structure of abelian profinite groups

Author

Ferrer, María V. and Hernández, Salvador

Subjects
Mathematics - Group Theory, Mathematics - General Topology
Abstract

A subgroup $G$ of a product $\prod\limits_{i\in\mathbb{N}}G_i$ is \emph{rectangular} if there are subgroups $H_i$ of $G_i$ such that $G=\prod\limits_{i\in\mathbb{N}}H_i$. We say that $G$ is \emph{weakly rectangular} if there are finite subsets $F_i\subseteq \mathbb{N}$ and subgroups $H_i$ of $\bigoplus\limits_{j\in F_i} G_j$ that satisfy $G=\prod\limits_{i\in\mathbb{N}}H_i$. %We say that $G$ is a \emph{subdirect product} of the family $\{G_i\}_{i\in I}$ if $G$ is weakly rectangular and %$G\cap\bigoplus\limits_{i\in I} G_i=\bigoplus\limits_{i\in\mathbb{N}}H_i$. In this paper we discuss when a closed subgroup of a product is weakly rectangular. Some possible applications to the theory of group codes are also highlighted.

Published
2018

29. Maternal urinary concentrations of bisphenol A during pregnancy are associated with global DNA methylation in cord blood of newborns in the “NELA” birth cohort

Author

Navarro-Lafuente, Fuensanta, Adoamnei, Evdochia, Arense-Gonzalo, Julián J., Prieto-Sánchez, María T., Sánchez-Ferrer, María L., Parrado, Antonio, Fernández, Mariana F., Suarez, Beatriz, López-Acosta, Antonia, Sánchez-Guillamón, Antonio, García-Marcos, Luis, Morales, Eva, Mendiola, Jaime, and Torres-Cantero, Alberto M.

Published
2022
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32. Impact of Small Valve Size on 1-Year Outcomes After Transcatheter Aortic Valve Implantation in Women (from the WIN-TAVI Registry)

Author

Pivato, Carlo A., Cao, Davide, Spirito, Alessandro, Sartori, Samantha, Nicolas, Johny, Chiarito, Mauro, Snyder, Clayton, Mehilli, Julinda, Lefèvre, Thierry, Stefanini, Giulio G., Presbitero, Patrizia, Capranzano, Piera, Tchetche, Didier, Iadanza, Alessandro, Vogel, Birgit, Sardella, Gennaro, Van Mieghem, Nicolas M., Nardin, Matteo, Tavenier, Anne H., Meliga, Emanuele, Dumonteil, Nicholas, Fraccaro, Chiara, Trabattoni, Daniela, Mikhail, Ghada, Sharma, Samin, Ferrer, Maria Cruz, Naber, Christoph, Kievit, Peter, Baber, Usman, Petronio, Anna S., Morice, Marie C., Chieffo, Alaide, Dangas, George, and Mehran, Roxana

Published
2022
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33. Interpolation sets in spaces of continuous metric-valued functions

Author

Ferrer, María V., Hernández, Salvador, and Tárrega, Luis

Subjects
Mathematics - General Topology
Abstract

Let $X$ and $M$ be a topological space and metric space, respectively. If $C(X,M)$ denotes the set of all continuous functions from X to M, we say that a subset $Y$ of $X$ is an \emph{$M$-interpolation set} if given any function $g\in M^Y$ with relatively compact range in $M$, there exists a map $f\in C(X,M)$ such that $f_{|Y}=g$. In this paper, motivated by a result of Bourgain in \cite{Bourgain1977}, we introduce a property, stronger than the mere \emph{non equicontinuity} of a family of continuous functions, that isolates a crucial fact for the existence of interpolation sets in fairly general settings. As a consequence, we establish the existence of $I_0$ sets in every nonprecompact subset of a abelian locally $k_{\omega}$-groups. This implies that abelian locally $k_{\omega}$-groups strongly respects compactness.

Published
2017

37. Comparison of the immune response following subcutaneous versus intranasal modified-live virus booster vaccination against bovine respiratory disease in pre-weaning beef calves that had received primary vaccination by the intranasal route

Author

Palomares, Roberto A., Bittar, João H.J., Woolums, Amelia R., Hoyos-Jaramillo, Alejandro, Hurley, David J., Saliki, Jeremiah T., Ferrer, Maria S., Bullington, Anna C., Rodriguez, Adriana, Murray, Tyler, Thoresen, Merrilee, Jones, Katie, and Stoskute, Agne

Published
2021
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38. A countable free closed non-reflexive subgroup of Z^c

Author

Ferrer, Maria Vincenta, Hernández, Salvador, and Shakhmatov, Dmitri

Subjects
Mathematics - General Topology, Mathematics - Functional Analysis, Mathematics - Group Theory, Primary: 22A25, Secondary: 20C15, 20K30, 22A05, 54B10, 54D30, 54H11
Abstract

We prove that the group G=Hom(P,Z) of all homomorphisms from the Baer-Specker group P to the group Z of integer numbers endowed with the topology of pointwise convergence contains no infinite compact subsets. We deduce from this fact that the second Pontryagin dual of G is discrete. As G is non-discrete, it is not reflexive. Since G can be viewed as a closed subgroup of the Tychonoff product of continuum many copies of the integers Z, this provides an example of a group described in the title, thereby answering Problem 11 from [J.Galindo, L.Recorder-N\'{u}\~{n}ez, M.Tkachenko, Reflexivity of prodiscrete topological groups, J. Math. Anal. Appl. 384 (2011), 320--330.] It follows that an inverse limit of finitely generated (torsion-)free discrete abelian groups need not be reflexive.

Published
2015
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43. Contributors

Author

Agnello, Kimberly A., primary, Akbar, Zeeshan, additional, Al-Juhaishi, Oday Alawi, additional, Aleman, Monica, additional, Anderson, David E., additional, Bailey, Simon, additional, Bamford, Nicholas, additional, Beck, Cathy, additional, Berman, Julie, additional, Bevevino, Kari E., additional, Boemo, Christopher M., additional, Bramski, Jessica, additional, Carberry, Carol, additional, Carlson, Nick, additional, Center, Sharon A., additional, Christie, Katherine, additional, Coleman, Michelle, additional, Constant, Caroline, additional, Credille, Brenton C., additional, Davies, Helen M.S., additional, Davis, Amanda, additional, de Aguiar, Luis Henrique, additional, de Lahunta, Alexander, additional, de Solis, Christobal Navas, additional, de Matos, Ricardo, additional, DeSante, Sarah, additional, Desrochers, André, additional, Dobbie, Tamara, additional, Dooley, Laura M., additional, Elliott, Singen, additional, Epstein, Kira Lyn, additional, Faux, Cynthia M., additional, Fecteau, Gilles, additional, Fecteau, Marie-Eve, additional, Ferguson, Ray, additional, Ferrer, Maria, additional, Fiani, Nadine, additional, Flanders, James, additional, Fogle, Callie, additional, Fubini, Susan, additional, Gallastegui, Aitor, additional, García-López, José M., additional, Gerard, Mathew, additional, Getman, Liberty M., additional, Gilger, Brian, additional, Gilsenan, William F., additional, Glass, Eric N., additional, Goni, Jose, additional, Grenager, Nora S., additional, Hess, Rebecka S., additional, Holcombe, Susan J., additional, Holt, David, additional, Holyoak, G. Reed, additional, Jacobs, Carrie, additional, Johnson, Amy L., additional, Johnstone, Laura, additional, Kent, Marc, additional, Kieffer, Phillip, additional, Kimura, Shune, additional, King, Titia Luise, additional, Koenig, Judith, additional, Krekeler, Natali, additional, Ledbetter, Eric, additional, Lepage, Olivier M., additional, Levine, David, additional, Linton, Jennifer, additional, Logsdon, Marcie L., additional, Lopez, Brina, additional, Lossi, Laura, additional, Luethy, Daniela, additional, Lyman, Candace, additional, Marchionatti, Emma, additional, McCoy, Annette M., additional, Merighi, Adalberto, additional, Miller, Meredith, additional, Morrisey, James K., additional, Murray, Christina, additional, Murray, Euan, additional, Nichols, Sylvain, additional, Niehaus, Andrew J., additional, Nuss, Karl, additional, Orsini, James A., additional, Oyama, Mark A., additional, Palermo, Shannon M., additional, Palmeiro, Brian, additional, Parente, Eric, additional, Peralta, Santiago, additional, Pesato, Michael, additional, Peterson, Mark E., additional, Pinto, Carlos, additional, Pozor, Malgorzata, additional, Prange, Timo, additional, Randolph, John F., additional, Reuss, Sarah M., additional, Romagnoli, Stefano, additional, Rondeau, Mark P., additional, Rousseau, Marjolaine, additional, Schrank, Magdalena, additional, Schumacher, James, additional, Sertich, Patricia L., additional, Shearer, Tara R., additional, Smith, Billy I., additional, St. Pierre, Alexandra, additional, Sugiyama, Takanori, additional, Toth, Ferenc, additional, Trainor, Karen, additional, Tyma, Jesse, additional, Vanderwall, Dirk K., additional, Wallett, Lane A., additional, Williams, Jarred, additional, Wininger, Fred, additional, Withowski, Katie, additional, and Xue, Cynthia, additional

Published
2022
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