This book presents novel formalizations of three of the most important medieval logical theories: supposition, consequence and obligations. In an additional fourth part, an in-depth analysis of the concept of formalization is presented - a crucial concept in the current logical panorama, which as such receives surprisingly little attention.Although formalizations of medieval logical theories have been proposed earlier in the literature, the formalizations presented here are all based on innovative vantage points: supposition theories as algorithmic hermeneutics, theories of consequence analyzed (...) with tools borrowed from model-theory and two-dimensional semantics, and obligations as logical games. For this reason, this is perhaps the first time that these medieval logical theories are made fully accessible to the modern philosopher and logician who wishes to obtain a better grasp of them, but who has always been held back by the lack of appropriate ‘translations' into modern terms.Moreover, the book offers a reflection on the very nature of logic, a reflection that is prompted by the comparisons between medieval and modern logic, their similarities and dissimilarities. It is thus a contribution not only to the history of logic, but also to the philosophy of logic, the philosophy of language and semantics.The analysis of medieval logic is also relevant for the modern philosopher and logician in that, being the unifying methodology used across all disciplines at that time, logic really provided unity to science. It thus presents a unified model of scientific investigation, where logic plays the aggregating role. (shrink)

En el siglo XIV se propusieron dos teorías principales para explicar el aumento y la reducción de las cualidades, entendidas éstas como formas accidentales. Quienes defendían alguna de estas dos teorías sostenían que una cualidad aumenta o se reduce debido a que se añaden o se substraen partes de sí misma, o bien, que una cualidad aumenta o se reduce debido a que una nueva forma más o menos perfecta sustituye a la forma ya inherente en una cierta substancia. Ockham (...) defendió la primera teoría con respecto a los estados mentales, entendidos como cualidades. Chatton defendió en sus primeros escritos ambas teorías y después sólo defendió la segunda. Las teorías de Ockham y Chatton están basadas en dos perspectivas distintas sobre la naturaleza del cambio o el movimiento. Ambas teorías, además, implican mecanismos distintos para regular la mayor o menor perfección de un estado mental. (shrink)