Revisiting the compositional data. Some fundamental questions and new prospects in Archaeometry and Archaeology

In this paper we examine the problem of compositional data from a different starting point. Chemical compositional data, as used in provenance studies on archaeological materials, will be approached from the measurement theory. The results will show, in a very intuitive way that chemical data can only be treated by using the approach developed for compositional data. It will be shown that compositional data analysis is a particular case in projective geometry, when the projective coordinates are in the positive orthant, and they have the properties of logarithmic interval metrics. Moreover, it will be shown that this approach can be extended to a very large number of applications, including shape analysis. This will be exemplified with a case study in architecture of Early Christian churches dated back to the 5th-7th centuries AD

A survey addressing the fundamental matrix estimation problem

Epipolar geometry is a key point in computer vision and the fundamental matrix estimation is the only way to compute it. This article surveys several methods of fundamental matrix estimation which have been classified into linear methods, iterative methods and robust methods. All of these methods have been programmed and their accuracy analysed using real images. A summary, accompanied with experimental results, is given

El carácter fronterizo de las identidades contemporáneas: el caso de Chiapas

The thesis or hypothesis of this paper is that the multiple connections of explicit and implicit life styles foster the construction of hybrid, multiple or complex identities. We mean by hybrid identities the confluence of multiple identifications in the personal biography. If the globalization and cultural diversity are the fundamental forms of global life, the mobility is its principal ingredient. We describe different cultural traits in Chiapas. Internet, migration to United States, or the North American Free Trade Agreement (NAFTA), between North America, Canada, and Mexico, were hybridized with the heterogeneity of identity (ethnic, linguistic, and religious). It is discussed the social and political consequences of the hybrid contemporary societies