Posterior Analytics is a treatise written by Aristotle in which he explores the nature of knowledge and how we acquire it. Aristotle argues that knowledge is obtained through a process of demonstration, which involves the use of syllogistic reasoning to arrive at a conclusion. He distinguishes between different types of demonstration, including demonstration from necessary principles and demonstration from things known to be true. Aristotle also examines the role of definition in acquiring knowledge. He argues that definitions are necessary for understanding the nature of a thing and for establishing the principles that underlie it. He also emphasizes the importance of causal analysis in acquiring knowledge, as it allows us to understand the relationships between different things and to identify the underlying causes of phenomena. Read in English, unabridged.