Language and Proofs for Higher-Order SMT (Work in Progress)

Satisfiability modulo theories (SMT) solvers have throughout the years been able to cope with increasingly expressive formulas, from ground logics to full first-order logic modulo theories. Nevertheless, higher-order logic within SMT is still little explored. One main goal of the Matryoshka project, which started in March 2017, is to extend the reasoning capabilities of SMT solvers and other automatic provers beyond first-order logic. In this preliminary report, we report on an extension of the SMT-LIB language, the standard input format of SMT solvers, to handle higher-order constructs. We also discuss how to augment the proof format of the SMT solver veriT to accommodate these new constructs and the solving techniques they require.Comment: In Proceedings PxTP 2017, arXiv:1712.0089

Groupoid symmetry and constraints in general relativity

When the vacuum Einstein equations are cast in the form of hamiltonian evolution equations, the initial data lie in the cotangent bundle of the manifold M\Sigma\ of riemannian metrics on a Cauchy hypersurface \Sigma. As in every lagrangian field theory with symmetries, the initial data must satisfy constraints. But, unlike those of gauge theories, the constraints of general relativity do not arise as momenta of any hamiltonian group action. In this paper, we show that the bracket relations among the constraints of general relativity are identical to the bracket relations in the Lie algebroid of a groupoid consisting of diffeomorphisms between space-like hypersurfaces in spacetimes. A direct connection is still missing between the constraints themselves, whose definition is closely related to the Einstein equations, and our groupoid, in which the Einstein equations play no role at all. We discuss some of the difficulties involved in making such a connection.Comment: 22 pages, major revisio

Time-evolution of the Rule 150 cellular automaton activity from a Fibonacci iteration

The total activity of the single-seeded cellular rule 150 automaton does not follow a one-step iteration like other elementary cellular automata, but can be solved as a two-step vectorial, or string, iteration, which can be viewed as a generalization of Fibonacci iteration generating the time series from a sequence of vectors of increasing length. This allows to compute the total activity time series more efficiently than by simulating the whole spatio-temporal process, or even by using the closed expression.Comment: 4 pages (3 figs included

Can Digital Technology Enhance Social Connectedness Among Older Adults? A Feasibility Study

This study examined the feasibility of a novel communication technology to enhance social connectedness among older adults in residential care. Research suggests that technology can create opportunities for social connectedness, helping alleviate social isolation and loneliness. Studies on implementation and feasibility of such technological interventions, particularly among frail and institutionalized older adults, are scant. Data were gathered in a 3-month deployment with 12 older adults, including semistructured interviews with participants and relatives/friends, psychometric scales, field observations, and usability tests. Data were analyzed with qualitative profiling, thematic analysis, and Friedman tests. The technology was a feasible communication tool, although requiring an adaptation period. Use increased perceived social interaction with ties, but increased social connectedness (meaningful social interaction) was only reported by participants with geographically distant relatives. Sense of well-being and confidence with technology was enhanced, but negative effects were also observed. Findings are useful for researchers and practitioners interested in technological interventions.info:eu-repo/semantics/publishedVersio

Guía de manejo @GeSTOCK 2.0

CD-T 658.05 B232; 30 pOfrecer al usuario del software @GeSTOCK 2.0 una herramienta útil en el mundo del almacenamiento, las ventas, compras y bases de datos. El programa posee una plataforma familiarizada con Windows para el fácil manejo de los comandos y práctico aprendizaje.Universidad Libre Seccional Pereir

Lista de chequeo para evaluar indicadores cognitivos conductuales de los tipos de agresores conyugales Pitbull y Cobra

Curso de Especial InterésEl objetivo del presente trabajo fue diseñar un instrumento para evaluar indicadores cognitivo conductuales de los tipos de agresores conyugales Pitbull y Cobra, que permita orientar al operador jurídico en el restablecimiento de derechos de la víctima. Para tal fin se realizó una lista de chequeo la cual cuenta con una hoja de respuesta, 20 ítems de preguntas, dividido de la siguiente manera: 6 ítems que evalúan el factor conductual; 5 ítems los cuales evalúan el factor cognitivo; 5 ítems que evalúan el factor emocional y 4 ítems que evalúan el factor de interacción, manual de aplicación en el que se describen los datos solicitados al usuario y la forma en la cual debe calificar el cuestionario. La aplicación del cuestionario tiene una duración de 15 minutos. El I.T.A.C.P.C. es una herramienta la cual es útil en la evaluación de violencia conyugal y está diseñada para ser utilizada por las instituciones gubernamentales como el CAVIF, Fiscalía, Comisaría de Familia.63 p.1,Resumen. 2 Justificación. 3 Agresores Conyugales. 4 Víctima y su clasificación. 5 Víctima más culpable o víctima únicamente culpable. 6 Victimario. 7 Violencia. 8 Violencia intrafamiliar. 9 Tipos de violencia intrafamiliar. 10 Familia. 11 Tipos de Agresores. 12 Lista de Chequeo. 13 Marco Legal. 14 Marco Ético. 15 Planteamiento del problema. 16 Objetivos. 17 Método. 18 Objetivos. 19 Los Clientes. 20 Resultados del estudio de mercado. 21 Conclusiones. 22 Referencias. 23 Apéndices.PregradoPsicólog

Uma contribuição ao estudo dos procedimentos para a constituição e estruturação da escrita contábil de uma empresa de táxi aéreo

TCC (Graduação) - Universidade Federal de Santa Catarina. Centro Socioeconômico. Curso de Ciências ContábeisAtualmente, a crescente competitividade no mundo dos negócios, obriga o contador a se aperfeiçoar cada vez mais, em áreas ainda pouco exploradas. Por conseguinte, os empresários da aviação, necessitam que os profissionais, contadores, os orientem e os auxiliem, desde a constituição até a estruturação da escrita contábil de uma empresa de táxi aéreo, também conhecida como empresa de transporte aéreo não regular. Este estudo enfatizou a importância do cumprimento de todas as exigências jurídicas e técnicas baseadas na legislação vigente para estar em operação regular junto ao Departamento de Aviação Civil. A metodologia adotada constitui-se essencialmente de pesquisa bibliográfica e pesquisa documental, além de apresentar características de investigação exploratória. Utilizou a tipologia qualitativa, quanto à abordagem do problema. Foi possível evidenciar a importância de se ter uma empresa totalmente legalizada, evitando assim a clandestinidade, que tanto contribui para a distorção da concorrência leal. Constatou-se que os contadores são responsáveis pela obtenção de conhecimento e de aprendizagem contábil, configurando-se como o alicerce para um bom desempenho profissional

Incorporation of excluded volume correlations into Poisson-Boltzmann theory

We investigate the effect of excluded volume interactions on the electrolyte distribution around a charged macroion. First, we introduce a criterion for determining when hard-core effects should be taken into account beyond standard mean field Poisson-Boltzmann (PB) theory. Next, we demonstrate that several commonly proposed local density functional approaches for excluded volume interactions cannot be used for this purpose. Instead, we employ a non-local excess free energy by using a simple constant weight approach. We compare the ion distribution and osmotic pressure predicted by this theory with Monte Carlo simulations. They agree very well for weakly developed correlations and give the correct layering effect for stronger ones. In all investigated cases our simple weighted density theory yields more realistic results than the standard PB approach, whereas all local density theories do not improve on the PB density profiles but on the contrary, deviate even more from the simulation results.Comment: 23 pages, 7 figures, 1 tabl

Biomechanical and morphological changes produced by ionizing radiation on bone tissue surrounding dental implant

Objective: This study analyzed the effect of ionizing radiation on bone microarchitecture and biomechanical properties in the bone tissue surrounding a dental implant. Methodology: Twenty rabbits received three dental morse taper junction implants: one in the left tibia and two in the right tibia. The animals were randomized into two groups: the nonirradiated group (control group) and the irradiated group, which received 30 Gy in a single dose 2 weeks after the implant procedure. Four weeks after the implant procedure, the animals were sacrificed, and the implant/bone specimens were used for each experiment. The specimens (n=10) of the right tibia were examined by microcomputed tomography to measure the cortical volume (CtV, mm3), cortical thickness (CtTh, mm) and porosity (CtPo, %). The other specimens (n=10) were examined by dynamic indentation to measure the elastic modulus (E, GPa) and Vickers hardness (VHN, N/mm2) in the bone. The specimens of the left tibia (n=10) were subjected to pull-out tests to calculate the failure load (N), displacement (mm) up to the failure point and interface stiffness (N/mm). In the irradiated group, two measurements were performed: close, at 1 mm surrounding the implant surface, and distant, at 2.5 mm from the external limit of the first measurement. Data were analyzed using one-way ANOVA, Tukey’s test and Student’s t-test (α=0.05). Results: The irradiated bone closer to the implant surface had lower elastic modulus (E), Vickers hardness (VHN), Ct.Th, and Ct.V values and a higher Ct.Po value than the bone distant to the implant (P<0.04). The irradiated bone that was distant from the implant surface had lower E, VHN, and Ct.Th values and a higher Ct.Po value than the nonirradiated bone (P<0.04). The nonirradiated bone had higher failure loads, displacements and stiffness values than the irradiated bone (P<0.02). Conclusion: Ionizing radiation in dental implants resulted in negative effects on the microarchitecture and biomechanical properties of bone tissue, mainly near the surface of the implant