## Hemeroteca del mes abril, 2013

Por • 29 abr, 2013 • Category: Nacionales

El año 2012 el asesor de Guerra Sucia Electoral J.J. Rendón aconsejó centrar la propaganda en un tema: la Inseguridad. Los medios de comunicación opositores se dedicaron obsesivamente a reseñar crímenes horrendos y divulgar cifras de muertes violentas que confundían tendenciosamente homicidios y accidentes de tránsito o laborales. En el cierre de campaña electoral, el candidato opositor clamó: Que cese la violencia. La estrategia rindió dividendos, a pesar de que el estado que el candidato perdedor gobierna presenta los mayores índices de homicidios del país, seguidos por los de otros estados administrados por la oposición.

#### Completitud y continuidad en Fundamentos de la Geometría de Hilbert: acerca del Vollständigkeitsaxiom

Por • 29 abr, 2013 • Category: Filosofía

El artículo documenta y analiza las vicisitudes en torno a la incorporación de Hilbert de su famoso axioma de completitud, en el sistema axiomático para la geometría euclídea. Esta tarea es emprendida sobre la base del material que aportan sus notas manuscritas para clases, correspondientes al período 1894–1905. Se argumenta que este análisis histórico y conceptual no sólo permite ganar claridad respecto de cómo Hilbert concibió originalmente la naturaleza y función del axioma de completitud en su versión geométrica, sino que además permite disipar equívocos en cuanto a la relación de este axioma con la propiedad de completitud de un sistema axiomático, tal como fue concebida por Hilbert en esta etapa inicial.

#### How hard is it to control an election by breaking ties?

Por • 29 abr, 2013 • Category: sociologia

We study the computational complexity of the problem of controlling the result of an election by breaking ties. When the chair is only asked to break ties to choose between one of the co-winners, the problem is trivially easy. However, in multi-round elections like STV, we prove that it can be NP-hard for the chair to compute how to break ties to ensure a given result. Our results contain several surprises. For example, whilst it is NP-hard to compute a manipulating vote for a multi-round rule like Nanson, it is polynomial for the chair to control the result by breaking ties. As a second example, it can be NP-hard to control an election by breaking ties even with a simple two-stage voting rule.

#### Lenin y la organización de las emociones

Por • 28 abr, 2013 • Category: Política

#### Egología y fenomenología: la crítica heideggeriana de Husserl

Por • 27 abr, 2013 • Category: Opinion

Como es sabido, el curso semestral desarrollado por M. Heidegger en la U. de Marburgo durante el verano de 1925 fue escenario de una discusión con la fenomenología husserliana. En él Heidegger presenta una especie de primera versión de lo que será el objeto de su obra Sein und Zeit. El centro de las crítica se sitúa claramente del lado del ego. El análisis heideggeriano parte de la idea de que la intencionalidad pertenece al ámbito de una región del ser, la conciencia. La cuestión es saber si el pensamiento de la intencionalidad ha planteado o no la cuestión previa del ser de esa región.

#### Inference and learning in probabilistic logic programs using weighted Boolean formulas

Por • 27 abr, 2013 • Category: Ambiente

Probabilistic logic programs are logic programs in which some of the facts are annotated with probabilities. This paper investigates how classical inference and learning tasks known from the graphical model community can be tackled for probabilistic logic programs. Several such tasks such as computing the marginals given evidence and learning from (partial) interpretations have not really been addressed for probabilistic logic programs before.

#### Graph Logics with Rational Relations

Por • 27 abr, 2013 • Category: Crítica

We investigate some basic questions about the interaction of regular and rational relations on words. The primary motivation comes from the study of logics for querying graph topology, which have recently found numerous applications. Such logics use conditions on paths expressed by regular languages and relations, but they often need to be extended by rational relations such as subword or subsequence. Evaluating formulae in such extended graph logics boils down to checking nonemptiness of the intersection of rational relations with regular or recognizable relations (or, more generally, to the generalized intersection problem, asking whether some projections of a regular relation have a nonempty intersection with a given rational relation).

#### Networks in Cognitive Science

Por • 27 abr, 2013 • Category: Educacion

Networks of interconnected nodes have long played a key role in cognitive science, from artificial neural networks to spreading activation models of semantic memory. Recently, however, a new Network Science has been developed, providing insights into the emergence of global, system-scale properties in contexts as diverse as the Internet, metabolic reactions or collaborations among scientists. Today, the inclusion of network theory into cognitive sciences, and the expansion of complex systems science, promises to significantly change the way in which the organization and dynamics of cognitive and behavioral processes are understood.

#### The drastic outcomes from voting alliances in three-party bottom-up democratic voting (1990 $\rightarrow$ 2013)

Por • 27 abr, 2013 • Category: sociologia

The drastic effect of local alliances in three-party competition is investigated in democratic hierarchical bottom-up voting. The results are obtained analytically using a model which extends a sociophysics frame introduced in 1986 \cite{psy} and 1990 \cite{lebo} to study two-party systems and the spontaneous formation of democratic dictatorship. It is worth stressing that the 1990 paper was published in the Journal of Statistical Physics, the first paper of its kind in the journal. It was shown how a minority in power can preserve its leadership using bottom-up democratic elections. However such a bias holds only down to some critical value of minimum support. The results were used latter to explain the sudden collapse of European communist parties in the nineties. The extension to three-party competition reveals the mechanisms by which a very small minority party can get a substantial representation at higher levels of the hierarchy when the other two competing parties are big.

#### An Acataleptic Universe

Por • 27 abr, 2013 • Category: Ciencia y tecnología

John Wheeler advocated the principle that information is the foundation of physics and asked us to reformulate physics in terms of bits. The goal is to consider what we know already and work out a new mathematical theory in which space, time and matter are secondary. An application of the converse of Noether’s second theorem to the holographic principle implies that physics must have an underlying hidden symmetry with degrees of symmetry that match physical degrees of freedom in order to account for the huge redundancy of information in the interior of a black-hole. I have been working on a theory that builds infinite dimensional symmetries using layers of quantisation from information as suggested by Wheeler’s contemporary Carl von Weizs\”acker.