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CC Intro Logic- Ls.1

Introductory Logic by James Nance & Douglas Wilson, 4th ed.

Logic The art and science of reasoning well.
Law of Excluded Middle Any statement is either true or false.
Law of Identity If a statement is true, then it is true.
Law of Non-contradiction A statement cannot be both true and false.
Formal Logic Deals with the proper modes of reasoning
Informal Logic Deals with operations of thinking that are indirectly related to reasoning.
Induction Reasoning with probability from examples or experience to general rules.
Deduction Reasoning with certainty from premises to conclusions.
Term A concept that can be expressed precisely
Definition A statement that gives the meaning of a term.
Ambiguous A word that has more than one definition.
Vague A word whose extent is unclear.
6 Purposes of Definitions 1. shows relationships 2. remove ambiguity 3. reduce vagueness 4. increase vocabulary 5. explain concepts theoretically 6. influence attitudes
Lexical Definition A single, established meaning of a term, from a dictionary.
Precising Definition Reduces the vagueness of a term.
Stipulative Definition A new word is invented.
Pursuasive Definition The aim is to persuade the listener to the term being defined.
Created by: kirasayler