What were the key ideas of John Dumbleton?

John Dumbleton, also known as John of Dumbleton, was a medieval philosopher who lived in the 14th century. He is primarily known for his contributions to the field of logic.

One of the key ideas of John Dumbleton was his theory of supposition. Supposition refers to the way terms are used in a proposition to represent objects or concepts. Dumbleton classified supposition into three types: personal supposition, simple supposition, and material supposition. Personal supposition refers to the way a term represents an individual object or person. Simple supposition refers to the way a term represents a general concept or class of objects. Material supposition refers to the way a term represents the physical object or substance it signifies.

Another important idea of Dumbleton was his theory of ampliation. Ampliation refers to the process of extending the meaning of a term beyond its usual or literal sense. Dumbleton argued that ampliation is necessary for understanding certain types of propositions, particularly those involving future or contingent events.

Overall, John Dumbleton's key ideas revolved around the study of logic, particularly the theory of supposition and the concept of ampliation. His work contributed to the development of logical theories during the medieval period.