Argument: a set of propositions consisting of premises and a conclusion. O Deduction: arguments where the conclusion follows necessarily from the Premises. O Induction: arguments where the conclusion follows from the premises with Some degree of probability. O Validity: when it is impossible for a deductive argument to have all true Premises and a false conclusion. O Soundness: when a deductive argument is valid and all the premises are Actually true. O Strength: when the conclusion is probable/likely relative to the premises in an Inductive argument. O Reliability: when an inductive argument is strong and all the premises are Actually true.
Divided Line analogy, the study of necessary truths (arithmetic, geometry, astronomy, music, dialectic), and the forms.