This book rivals his Categories in terms of clarity and focus. I found it far more enjoyable than Prior Analytics. It does get fairly technical at the end, though.
Every proposition is either of a genus or a particular. That which is peculiar to an entity signifies its essence (1.4). This is known as the definition. There are four elements in the Topics: property, definition, genus, accident.
A property is a predicate that doesn’t indicate the essence of a thing, yet belongs to that thing alone. An essential property distinguishes a thing from everything else (5.1). A relative property states the difference x and y.
Sameness: if we say x is the same as y, do we mean it numerically, generically, or specifically?
Def. thesis = supposition of some general philosopher.
Try to note how the proposition would sound in its most universal form. Aristotle means you need to have it in a categorical universal (All A is B). This allows you to then turn the one into many.
A term is unclear if it has more than one intermediary. For example, if a term’s contrary bears several senses, then it is probably unclear.
A brief primer on rhetoric:
How to reason through a problem (1.20).
1) Secure the proposition.
2) Distinguish in what sense the expression is used.
3) Note the differences and likenesses.
4) Induction is more persuasive than deduction, since it relies on the senses.
5) When you develop a point (or seek to overthrow one), your term should be both specific yet framed in an easy, familiar way (II.4).
6) If you are confused by a thesis, convert it to a negative and see if the contrary makes sense (6.2).
7) Make your strongest point your last point, as people are likely to doubt your earlier points. This has a cumulative rhetorical effect (8.1).
Success for life. For some reason this is easily convertible to business.
1) That which is more lasting is more desirable than that which is less so.
2) Desire that which is the cause of the Good more than what results from it (III.1).
3) The goal is more desirable than the means.