ABSTRACT
All arguments are constructed out of propositions or statements, so we begin by discussing them. A proposition is something that can be asserted or denied. A proposition is either true or false. It is true if it corresponds with the facts it describes. If it does not correspond, it is false. In this way propositions differ from questions, requests, commands, and exclamations, none of which can be asserted or denied. Although a defining feature of propositions is that they are either true or false, we may not always know whether a given proposition is true or false.
