El presente libro no es una simple reedicion de La Prehistoria de Andre Leroi-Gourhan, sino una obra completamente renovada. A partir de entonces, la investigacion, y junto con ellos nuestros conocimientos, han progresado considerablemente. Asi, mas que al antiguo plano cronologico (Paleolitico inferior, medio y superior, Mesolitico y Neolitico), se ha dado preferencia a un nuevo planteamiento regional que nos da mejor cuenta de la diversidad de la evolucion de las culturas humanas.

This book contains the proceedings of the AMS Special Session, in honor of S. K. Jain's 80th birthday, on Categorical, Homological and Combinatorial Methods in Algebra held from March 16-18, 2018, at Ohio State University, Columbus, Ohio. The articles contained in this volume aim to showcase the current state of art in categorical, homological and combinatorial aspects of algebra.

This book contains the proceedings of the Fifth International Conference on Noncommutative Rings and their Applications, held from June 12-15, 2017, at the University of Artois, Lens, France. The papers are related to noncommutative rings, covering topics such as: ring theory, with both the elementwise and more structural approaches developed; module theory with popular topics such as automorphism invariance, almost injectivity, ADS, and extending modules; and coding theory, both the theoretical aspects such as the extension theorem and the more applied ones such as Construction A or Reed-Muller codes. Classical topics like enveloping skewfields, weak Hopf algebras, and tropical algebras are also presented.