The notion of the proposition is one of the most important concepts in Aristotelian Logic. In this lesson, we discussed the three parts of any proposition: the subject, predicate, and copula. We also discussed various forms that the copula may take and the ways in which multiple propositions can mean the same thing. In further lessons, we’ll continue to discuss propositions, the forms they may take, the ways in which they express certain ideas, and how different propositions relate to each other. Most importantly, since both the subject and the predicate are terms designating categories, we will look at how propositions relate categories.