Brentanos 1904 vollendete Theorie, nur Reales sei vorstellbar und könne existieren, führte auch unter seinen Schülern zu Kontroversen. Dieser Band enthält eine umfangreiche Studie, die Einleitung der Herausgeber zu diesem Problemkreis, Auszüge aus dem Briefwechsel mit A. Marty und O. Kraus sowie die einschlägigen Abhandlungen Brentanos.

H. 46 und H 47: >Geschichte der Philosophie mit älteren, von Brentano ausgeschiedenen Blättern. ... Vorlesung über >Geschichte der mittelalterlichen Philosophie im christlichen Abendland< nicht mehr angekündigt worden. ' Die von F.

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Dem durch Kant verschütteten Verständnis der aristotelischen Kategorienlehre brach schon Brentanos erste Schrift 'Von der mannigfachen Bedeutung des Seienden nach Aristoteles' Bahn. Zu ihrem Thema kehrt er in den hier vereinten Diktaten aus seinem letzten Jahrzehnt zurück.

Democratic decision-making is often defended on grounds of the ‘wisdom of crowds’: decisions are more likely to be correct if they are based on many independent opinions, so a typical argument in social epistemology. But what does it mean to have independent opinions? Opinions can be probabilistically dependent (threatening the ‘wisdom of crowds’) even if individuals form their opinion in causal isolation from each other. We distinguish four probabilistic notions of opinion independence. Which of them holds depends on how individuals (...) are causally affected by environmental factors such as commonly perceived evidence. In a general theorem, we identify causal conditions guaranteeing each kind of opinion independence. These results have implications for whether and how ‘wisdom of crowds’ arguments are possible, and how truth-conducive institutions can be designed. (shrink)

Unification was originally introduced in automated deduction and term rewriting, but has recently also found applications in other fields. In this article, we give a survey of the results on unification obtained in two closely related, yet different, application areas of unification: description logics and modal logics.

In this brief note I show how to model conceptual change, logical learning, and revision of one's beliefs in response to conditional information such as indicative conditionals that do not express propositions.