Lorenzo Peña

Recent work of Gustav Bergmann develops an ontological framework within which an account of relations has been sketched out. The approach is a kind of new logical atomism which has some of the features of an Aristotelian hylomorphism (of sorts). It recognizes a number of categories and groups of a hylomorphic kind, chiefly “determinates” and “subdeterminates”--the latter only indirectly or implicitly. Winsome though it is, the approach is flawed by certain difficulties it gives rise to, among them inability to speak of subdeterminates and failure of a relation to be had by a referent towards a relatum. Instead of having a sense, a relation is conceived of as a determinate which enters an arrangement whose existence and nature are not properly accounted for. Finally, Bergmann’s Ideal Language is assayed and shown not to be as useful philosophically in itself as he takes it to be.

Three (apparent ) deontic antinomies are discussed: the paradoxes of the watchman and the praiser, as weIl as deontic dilemmas. A paraconsistent deontic logic, Ad, is put forward whose underlying 1st-order calculus is an infinite-valued tensorial logic. Several arguments are offered bearing out be existence of deontic contradictions, while two ways of dealing with conditional obligation paradoxes within the framework of Ad are canvassed. While the aggregation rule and the ought-implies-can principle are upheld, sundry schemata are shown not to obtain which involve iterated deontic operators (most conspicuously: that whatever ought to be obligatory is obligatory; and that it is obligatory that whatever ought to be the case should in fact be the case).

Arthur Lovejoy's masterful, highly influential interpretation of Leibniz's philosophy has been almost neglected for decades now. This paper tries to rehabilitate Lovejoy's construal (with a number of adaptations) by delving into the underlying logical links connecting Leibniz's principles of order and gradation (the latter also called `law of continuity', `principle of transition' or `principle of the jumpless change': natura non facit saltus ) with other fundamental principles of his mature philosophy

The main starting point of many of the contributions collected into the book is the kind of Twin Earth considerations, along with meaning individualism. Is Putnam's claim about water in this world and a stuff in an alternative world being different materials?. Is meaning in the head? One seems allowed to be skeptical about the starting point of the debate between such as emphasize broad content and those who think that the basic semantic entities are narrow contents, which would fail to be world-dependent or world-oriented. The kind of motivations prompting the essays collected into the book are likely to be regarded as in need of a deeper elucidation by such as have been more or less influenced by Quine. Pettit & McDowell's collection of essays is one of the books most scholars interested in the confines of philosophy of language and philosophy of mind will find worth reading.

Many-Valued logics can harbour nonclassical connectives expressing truth-nuances. The course of development of many-valued logics has given rise to paraconsistent systems wherein a sentence can be both negated and asserted just in case it is only partly true. A recently implemented family of such logics is shown to be a useful tool in coping with a number of philosophical difficulties, such as Zeno’s paradox of the arrow. This family is somehow akin to fuzzy logics initiated by Zadeh, but unlike them it contains as a tautology the principle of excluded middle

Surge en nuestras sociedades la propiedad intelectual para resolver problemas generados por la evolución técnica. Unos la entienden como una noción sui generis, otros la recusan. Nuestro enfoque reductivo recalca sus semejanzas con la propiedad de otros bienes. Se aborda el problema de sus fundamentos, inclinándonos por una justificación relativa al actual marco institucional. Tales propuestas están ligadas a la dilucidación metafísica de los objetos sobre los que recae, brindándose una concepción de los mismos como cúmulos de possibilia. Así defendida, la propiedad intelectual tiene que desempeñar un papel social, recurriendo a la noción de servidumbres, voluntarias o legales, todo lo cual se aplica singularmente a los productos de la investigación científica en el ámbito académico, denunciándose la privatización de sus beneficios.

Introducción a la lógica matemática que se diferencia de los textos estándar que presuponen la verdad o la validez incuestionables de la lógica clásica o aristotélica (la que no admite grados de verdad ni contradicciones). Con este libro el estudiante se adentra en la lógica sin tener que presuponer nada en ese sentido; va descubriendo paulatinamente un abanico de lógicas, de las cuales la clásica es una de ellas, la más simple. El lector va así vislumbrando una inagotable pluralidad de lógicas posibles, algunas de las cuales vienen desarrolladas sintáctica y semánticamente.

A Fuzzy-Set Theoretical Framework -resting on a paraconsistent infinite-valued logic- is sketched, wherein a thorough ontological-reduction program can be carried out. The framework includes formulae of the form “x comprises z in the time-interval e”. Reducing aggregates to sets thus handled is shown to escape usual objections. Likewise, systems generally can be regarded as aggregates, hence as (fuzzy) sets -the purported nonextensionality of systems objection being disposed of owing to our system’s recognizing infinitely many membership degrees. So do bodies, too, which enables us to find a solutionto Unger’s sorites concerning ordinary material bodies