Online research in philosophy

Distributive bounded lattices with a dual homomorphism as unary operation, called Ockham algebras, were firstly studied by Berman (1977). The varieties of Boolean algebras, De Morgan algebras, Kleene algebras and Stone algebras are some of the well known subvarieties of Ockham algebra. In this paper, new results about the congruence lattice of Ockham algebras are given. From these results and Urquhart's representation theorem for Ockham algebras a complete characterization of the subdirectly irreducible Ockham algebras is obtained. These results are particularized for a large number of subvarieties of Ockham algebras. For these subvarieties a full description of their subdirectly irreducible algebras is given as well.

When Ockham's logic arrives in Italy, some Dominican philosophers bring into question Ockham's ontological reductionist program. Among them, Franciscus de Prato and Stephanus de Reate pay a great attention to refute Ockham's claim that no universal exists in the extra-mental world. In order to reject Ockham's program, they start by reconsidering the notion of 'real', then the range of application of the rational and the real distinction. Generally, their strategy consists in re-addressing against Ockham some arguments extracted from Hervaeus Natalis's works. Franciscus's and Stephanus's basic idea is that some universals are not acts of cognition, but extra-mental, predicable things. Such things are not separable from singulars, nonetheless they are not the same as those singulars. Consequently, it is not necessary to allow, as Ockham does, that if two things are not really identical, they are really different and hence really separable. According to them, it is possible to hold that two things are not really identical without holding that they are also really non-identical and hence really different. Basically, their reply relies on a different notion of the relation of identity. Identity is regarded as an intersection of classes of things, so that it is possible to say that two things are really identical without saying that they also are the same thing. Franciscus and Stephanus, however, do not seem to achieve completely their aim.

It is well-known that Chatton is among the earliest and most vehement critics of Ockham’s theory of judgment, but scholars have overlooked the role Chatton’s criticisms play in shaping Ockham’s final account. In this paper, I demonstrate that Ockham’s most mature treatment of judgment not only contains revisions that resolve the problems Chatton identifies in his earlier theories, but also that these revisions ultimately bring his final account of the objects of judgment surprisingly close to Chatton’s own. Even so, I argue that, at the end of the day, there remain significant differences between their respective analyses of the structure and intentionality of judicative states.

Humans have two kinds of beliefs, intuitive beliefs and reflective beliefs. Intuitive beliefs are a most fundamental category of cognition, defined in the architecture of the mind. They are formulated in an intuitive mental lexicon. Humans are also capable of entertaining an indefinite variety of higher-order or "reflective" propositional attitudes, many of which are of a credal sort. Reasons to hold "reflective beliefs" are provided by other beliefs that describe the source of the reflective belief as reliable, or that provide explicit arguments in favour of the reflective belief. The mental lexicon of reflective beliefs includes not only intuitive, but also reflective concepts.

The best way of becoming acquainted with William of Ockham and his Dialogue would be to read A.S. McGrade's "Introduction", "Principal Dates in Ockham's Life", and "Suggestions for Further Reading" in..

CHAPTER ONE Simple cognition Ockham's epistemology is founded upon the primacy of individual cognition. As coming first in the order of knowing, ...

Philosophy of science, statistics, and machine learning all recommend the selection of simple theories or models on the basis of empirical data, where simplicity has something to do with minimizing independent entities, principles, causes, or equational coefficients. This intuitive preference for simplicity is called Ockham's razor, after the fourteenth century theologian and logician William of Ockham. But in spite of its intuitive appeal, how could Ockham's razor help one find the true theory? For, in an updated version of Plato's Meno paradox, if we already know that the truth is simple, we don't need Ockham's help. And if we don't already know that the truth is simple, what entitles us to assume that it is?

The question of intellectual intuition in medieval philosophy is generally associated with names like John Duns Scotus and William Ockham whose majorcontributions to the development of the theory of intuition are well established. Nevertheless the way they approached this philosophical question is strongly related to the Franciscan tradition to which they both belonged so that an extensive comprehension of their theories of intuition requires the inquiry of their sources. As this paper means to show, Matthew of Aquasparta is one of John Duns Scotus’s most important sources in this matter and his treatment of both thequestions of direct intellectual knowledge of the material individual and of the self-knowledge of the soul are important in order to understand the role of theintelligible species and the immediate character of intuitive cognition. While for Matthew of Aquasparta there is no contradiction between the implication of thespecies in intuitive cognition and its immediacy, John Duns Scotus and William Ockham both find a contradiction between these aspects of knowledge andtherefore they both reject the presence of the species in intuitive cognition which is immediate. This paper will show the background of Matthew’s theory and theway he demonstrated that the presence of a species does not always qualify as mediation in knowledge and does not as such hinder the intuitive cognition.

In this paper I challenge recent externalist interpretations of Ockham’s theory of intuitive cognition. I begin by distinguishing two distinct theses that defenders of the externalist interpretation typically attribute to Ockham: a ‘direct reference thesis’, according to which intuitive cognitions are states that lack all internal, descriptive content; and a ‘causal thesis’, according to which intuitive states are wholly determined by causal connections they bear to singular objects. I then argue that neither can be plausibly credited to Ockham. In particular, I claim that the causal thesis doesn’t square with Ockham’s account of supernaturally produced intuition and that the direct reference thesis sits uneasily with Ockham’s characterization of the intentional structure of intuitive states.

INTRODUCTION OCKHAM'S LIFE AND THE DATE OF THE TREATISE William Ockham, a highly influential philosopher of the fourteenth century and one of the most ...