Logic

1. Mode of reasoning or inference.

2. Study of reasoning methods used to reach conclusions that are true, valid, certain, or characterized by other values, such as usefulness or acceptability.

3. Deductive reasoning. Syllogistic logic.

4. Inductive reasoning.

5. Propositional calculus.

6. Predicate calculus.

7. Logic of verbal expression.

8. Logic of mathematical expression. Mathematical logic.

9. Logic of symbolic expression.

10. Logics of formal relationships of elements in any composite: structure or activity.

11. Special logics, e.g., logic of classes or set theory in mathematics.

12. Generally, persuasive technique associated with order in rhetoric and argument.