Real Cubic Surfaces and Real Hyperbolic Geometry

The moduli space of stable real cubic surfaces is the quotient of real hyperbolic four-space by a discrete, nonarithmetic group. The volume of the moduli space is 37\pi^2/1080 in the metric of constant curvature -1. Each of the five connected components of the moduli space can be described as the quotient of real hyperbolic four-space by a specific arithmetic group. We compute the volumes of these components.Comment: 4 pages, one figur

Hyperbolic geometry and moduli of real cubic surfaces

Let M_0^R be the moduli space of smooth real cubic surfaces. We show that each of its components admits a real hyperbolic structure. More precisely, one can remove some lower-dimensional geodesic subspaces from a real hyperbolic space H^4 and form the quotient by an arithmetic group to obtain an orbifold isomorphic to a component of the moduli space. There are five components. For each we describe the corresponding lattices in PO(4,1). We also derive several new and several old results on the topology of M_0^R. Let M_s^R be the moduli space of real cubic surfaces that are stable in the sense of geometric invariant theory. We show that this space carries a hyperbolic structure whose restriction to M_0^R is that just mentioned. The corresponding lattice in PO(4,1), for which we find an explicit fundamental domain, is nonarithmetic.Comment: Major revision, including several new or completely rewritten sections. 56 page

Tomás Segovia: los ojos abiertos a la noche

_Entrevista de semblanza a profundidad realizada al poeta hispanomexicano Tomás Segovia en 1992. Se aborda la vida y la obra poética de este escritor

Guillermo Fernández: la razón secreta de la poesía

_Entrevista a profundidad con el poeta y traductor Guillermo Fernández qacerca de su obra poética, sus preocupaciones poéticas y su relación con la tradición literaria mística

Histories of Sexual Violence in Nineteenth- and Twentieth-Century Latin America: An Introduction

This is an open access article distributed under the Creative Commons Attribution-Non Commercial-No Derivatives 4.0 International. https://creativecommons.org/licenses/by-nc-nd/4.0/Objective/Context: This article explains why current events demand the exploration of histories of sexual violence, setting the four pieces that comprise this special issue in their broader historiographical and social context. Despite the important body of work that has been produced to date exploring issues related to gender and sexuality in this region during the nineteenth and twentieth century, sexual violence remains severely understudied. Methodology: Linking to protests against sexual and gender-based violence and harassment in Brazil and internationally since the mid-2010s, such as the global #MeToo campaign in 2017, the article reviews current scholarship on histories of sexual violence. Originality: This special issue represents a valuable collection of essays specifically devoted to the history of sexual violence in Latin America during the nineteenth and twentieth centuries. The article demonstrates why this is such a pressing issue for historians to consider in 2022 and contextualises the following contributions. Conclusions: There is an urgent need for further research into the histories of sexual violence across different Latin American countries in later modernity, especially since the issues highlighted by all four authors—particularly related to gender, racial, and class discrimination and stereotyping that harm victims—remain relevant to contemporary experiences.Peer reviewe

Nietzsche’s Idiosyncrasy Against Euripides

Lo scopo principale di questo articolo è presentare una critica alla lettura nietzscheana dello status valutativo della poesia di Euripide all’interno del processo storico-genealogico che il filosofo intende come costituente il declino della tragedia greca. Il carattere negativo - che presumibilmente radicalizza, rafforza e consuma questa ipotetica traiettoria di declino - della poesia euripidiana sarà qui imputato al condizionamento molto teorico della concezione nietzscheana del tragico. Per fare ciò, esploreremo tre linee guida fondamentali: (1) la subordinazione di Nietzsche a una linea interpretativa tradizionale; (2) il suo tendenzioso disprezzo per il contenuto concreto dell’intera opera euripidiana; (3) l’identificazione infondata tra Socrate ed Euripide.The main purpose of this article is to present a critique of the Nietzschean reading of the evaluative status of Euripides’ poetry within the historical-genealogical process that the philosopher understands as constituting the decline of the Greek tragedy. The negative character – supposedly radicalizing, potentializing and consuming this hypothetical trajectory of decline – of Euripidian poetry will here be imputed to the very theoretical conditioning of the Nietzschean conception of the tragic. To do this, we will explore three fundamental guidelines: (1) the subordination of Nietzsche to a traditional interpretative line; (2) his tendentious disregard for the concrete content of the whole Euripidian work; (3) the unfounded identification between Socrates and Euripides

Contributing to VRPN with a new server for haptic devices (ext. version)

This article is an extended version of the poster paper: Cuevas-Rodriguez, M., Gonzalez-Toledo D., Molina-Tanco, L., Reyes-Lecuona A., 2015, November. “Contributing to VRPN with a new server for haptic devices”. In Proceedings of the ACM symposium on Virtual reality software and technology. ACM.http://dx.doi.org/10.1145/2821592.2821639VRPN is a middleware to access Virtual Reality peripherals. VRPN standard distribution supports Geomagic® (formerly Phantom) haptic devices through the now superseded GHOST library. This paper presents VRPN OpenHaptics Server, a contribution to VRPN library that fully reimplements VRPN support of Geomagic Haptic Devices. The implementation is based on the OpenHaptics v3.0 HLAPI layer, which supports all Geomagic Haptic Devices. We present the architecture of the contributed server, a detailed description of the offered API and an analysis of its performance in a set of example scenarios.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech