Section 8.1-8.2

Section 8.1-8.2 - o P • Q T T T T F F F F T F F F • Ex...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Section 8.1-8.2 Review: Argument: inference from a set of premises to a conclusion, come in one of two flavors: o Inductive- conclusion probably follows from the premises o Deductive- conclusion definitely follows from the premises Valid Sound- valid argument with all true premises Unsound- valid argument with not all premises true Invalid Truth- pertains to propositions, either true or false Validity- pertains to a deductive argument Section 8.1-8.2 With English, certain phrases function ambiguously Artificial language allows for sidestepping of ambiguities Ex: “Ben likes ice cream” = P It’s not the case/it’s false that Ben likes ice cream = ~P ~ negation sign gives opposite truth value Can be symbolized using a truth table Ex: “Jerry likes cupcakes” = Q Conjunction- “Ben likes ice cream and Jerry likes cupcakes”
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: o P • Q T T T T F F F F T F F F • Ex 2: Ben likes ice cream or Jerry like cupcakes • P v Q o Disjunction: Inclusive- and/or Exclusive- one or the other but not both P v Q T T T T T F F T T P T F F F F • Punctuation o Ex: Ben likes ice cream or Jerry likes cupcakes but not both ‘But’ indicates conjunction In English conjunction uses But And However Yet Good rules of thumb but not fool proof Disjunction Or Either Unless [Ben likes ice cream] or [Jerry likes cupcakes] / but [it’s not the case that both Ben likes ice cream and Jerry likes cupcakes] (P v Q) • ~ (P • Q) T T T F F T T T T T F T T T F F F T T T T F F T F F F F F F F F Parentheses keep symbols from running together, also brackets...
View Full Document

This note was uploaded on 03/16/2011 for the course PHIL 045 taught by Professor Hopper during the Fall '07 term at GWU.

Page1 / 2

Section 8.1-8.2 - o P • Q T T T T F F F F T F F F • Ex...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online