The Questiones libri Porphirii is a commentary on Porphyry's Isagoge by the fourteenth-century logician Thomas Manlevelt. It is edited here in full. Not much is known of Thomas Manlevelt, but his work is remarkable enough. Following in the footsteps of William of Ockham, Manlevelt stresses the individual nature of all things existing in the outside world. He radically challenges our conceptional framework. He applies Ockham's razor in a ruthless manner to do away with all entities not deemed necessary for preservation. In the end, Manlevelt even maintains that substance does not exist. In this text early Ockhamism is being pushed to its extremes.

The Questiones libri Porphirii is a commentary on Porphyry's Isagoge by the fourteenth-century logician Thomas Manlevelt. In this text early Ockhamism is being pushed to its extremes. It is edited here in full.

The papers in this volume - written by well-known experts in the field - examine the rules for valid argument discovered and formulated in the works of medieval scholasticism and show their significance to modern discussions in logic and the philosophy of language. The editor's introductions make the papers interesting and comprehensible even to non-specialists.

Dialectic as the doctrine/art of disputing for and against a given thesis held a central position at the medieval schools and universities. The intensive examination of medieval manuscript sources in recent years has revealed the fertility and subtlety of scholastic thinking and its relevance to the modern study of logic and the philosophy of language. The contributions to this volume focus on a series of questions which were central to scholastic logic, the questions concerning the validity of argumentation and proof. The 35 papers - written partly in English and partly in German - range from examinations of basic questions of syntax and semantics and of the theory of inference through presentations of the rules which define logical consistency, to treatments on the use of logic in the natural sciences, in practical discourse and in theology. Some of the texts being thoroughly analysed and interpreted are edited in this volume for the first time. The authors include most of the established experts in the field and their papers provide a survey of the current state of research in both its historical and systematic aspects. The parallel English and German introductions by the editor link the individual papers to give an introduction to the scholastic theory of argumentation, which should also be comprehensible to non-specialists.

Studies the thought and actions of the Reformation's central figures - reformers, counter-reformers, and their supporters - in the light of ordinary people.

This volume, the first dedicated and comprehensive companion to medieval logic, covers both the Latin and the Arabic traditions, and shows that they were in fact sister traditions, which both arose against the background of a Hellenistic heritage and which influenced one another over the centuries. A series of chapters by both established and younger scholars covers the whole period including early and late developments, and offers new insights into this extremely rich period in the history of logic. The volume is divided into two parts, 'Periods and Traditions' and 'Themes', allowing readers to engage with the subject from both historical and more systematic perspectives. It will be a must-read for students and scholars of medieval philosophy, the history of logic, and the history of ideas.