A more thorough explanation:

Definition: A treatise is a book that provides a detailed and comprehensive analysis of a specific subject, often related to law or other academic fields. It explains the principles and rules of the subject and provides examples to illustrate them.

Example: A treatise on contract law would provide a thorough explanation of the principles and rules that govern contracts, including the requirements for a valid contract, the different types of contracts, and the remedies available for breach of contract. It would also provide examples of real-life contract disputes and how they were resolved in court.

Another example: A treatise on the history of art would provide a detailed analysis of the different art movements throughout history, including their characteristics, key artists, and major works. It would also provide examples of how these movements influenced each other and how they were received by the public and critics.

The examples illustrate how a treatise provides a comprehensive analysis of a subject and uses examples to illustrate its principles and rules.