Thomas Manlevelt : : Questiones libri Porphirii / / a critical edition with introduction and indices by Alfred van der Helm.

• Superior document: Studien und Texte zur Geistesgeschichte des Mittelalters, Band 113
• Author: Manlevelt, Thomas, active 14th century.
• TeilnehmendeR: Helm, Alfred van der.
• Place / Publishing House: Leiden : : Brill,, 2014.
• Year of Publication: 2014
• Language: English
• Series: Studien und Texte zur Geistesgeschichte des Mittelalters ; Bd. 113.
• Physical Description: 1 online resource (447 p.)
• Notes: Description based upon print version of record.
• Bibliography: Includes bibliographical references and index.
• ISBN: 9004264302
• ISSN: 1069-8028
• Hierarchical level: Monograph
• Statement of Responsibility: a critical edition with introduction and indices by Alfred van der Helm.

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.