PHIL 401 Lecture Notes - Lecture 2: Modus Ponens, Modus Tollens, Constructive Dilemma
Document Summary
Principles of charity: we are usually, all things equal, rational, we can usually expect people to believe what it would be reasonable to believe in a context given what they say or do. Rational reconstruction: piecing together ideas from speech or text to form a rational conclusion. Reasoning strategies: forms that are always valid. This does not mean the conclusion is true, you have to ask if the premises are true: double negation: Two false cancel out: modus ponens: Therefore, the star has a planet: modus tollens: (most powerful strategy!!!) Not q, then not p: disjunctive syllogism: (also known as constructive dilemma )
