An encyclopedia entry which covers various revisionary conceptions of which macroscopic objects there are, and the puzzles and arguments that motivate these conceptions: sorites arguments, the argument from vagueness, the puzzles of material constitution, arguments against indeterminate identity, arguments from arbitrariness, debunking arguments, the overdetermination argument, and the problem of the many.

Radically permissive ontologies like mereological universalism and material plenitude are typically motivated by concerns about arbitrariness or anthropocentrism: it would be objectionably arbitrary, the thought goes, to countenance only those objects that we ordinarily take there to be. Despite the prevalence of this idea, it isn't at all clear what it is for a theory to be “objectionably arbitrary,” or what follows from a commitment to avoiding arbitrariness in metaphysics. This paper aims to clarify both questions, and examines whether arguments (...) from arbitrariness really are the proper foundations for one or both varieties of ontological permissivism. I argue that these considerations (even when made more precise) are far less successful at motivating radical forms of permissivism than we often take them to be. To do better, permissivists must either supply a much more developed metaphysics of material objects, or a controversial (but tempting) conception of what we're doing when we do metaphysics. (shrink)

Dans le présent article, Maurice et Orensanz dialogueront sur quelques thèmes clés de l’œuvre de Bunge. L’objectif de ce dialogue est de faire avancer le programme métascientifique. Les principaux points abordés peuvent être présentés sous la forme d’une série de questions : est-il possible de prouver que le monde extérieur existe ? Qu’est-ce que la matière ? La relation partie à tout est-elle transi-tive ? Quelle est la différence entre les systèmes et les assortiments ? Les objets fictifs ont-ils une (...) fonction dans l’ontologie ? Bien qu’il s’agisse des sujets princi-paux, plusieurs autres points seront abordés tout au long de cet échange. (shrink)

[[THIS IS THE COMPLETE THIRD ISSUE OF MℇTASCIENCE]] -/- This third issue of the journal Mεtascience continues the characterization of this new branch of knowledge that is metascience. If it is new, it is not in a radical sense since Mario Bunge practiced it in an exemplary way, since logical positivists were accused of practicing only a mere metascience, since scientists have always practiced it implicitly, and since some philosophers no longer practice philosophy but rather metascience, but without characterizing it (...) or theorizing it, that is, without realizing that they have abandoned one general discourse for another. The novelty therefore lies in this awareness that a general discourse without philosophy is possible: a scientific general discourse. -/- The ten contributions gathered in this volume illustrate the metascientific approach to knowledge of the world as well as to knowledge of knowledge of the world, that is, science. And like Bunge’s project, they are neither part of the analytical movement nor the continental movement in philosophy. We will read here studies about the Bungean system, some applications of Bungean thought, some metascientific contributions, and some reflections around metascience. -/- Among metascientific disciplines, epistemology occupies a prominent place in this issue of Mεtascience. Metascience differs from philosophy in its rejection of the fundamental philosophical distinction between appearance and reality. Metascientific epistemology therefore does not postulate the existence of any metaphysical reality. But metascientific epistemology, no more than philosophical ontology, is a factual science. The first, because it studies scientific constructs and not concrete objects, the second, because it is interested in transcendent or metaphysical objects. (shrink)

What follows is a dialogue between Maurice and Orensanz, in which they will discuss some key topics stemming from Bunge’s oeuvre. The objective of this dialogue is to advance the metascientific program even further. The main points that will be discussed can be presented as a series of questions: Is it possible to prove that the external world exists? What is matter? Is the part-whole relation transitive? What is the difference between systems and assortments? Do fictional objects have a function (...) in ontology? Although those are the main topics, several other points will be discussed throughout this exchange. (shrink)