Introduction to Logic Exam 2

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  1. When does p → q come out false?
    • Only when p is true and q is false
    • (When p is false, it comes out true regardless of what q is)
  2. When does pVq come out false?
    • Only when both p and q are false
    • (When p is true, it comes out true regardless of what q is)
  3. How do you find validity in a truth table?
    • It's valid if it's always true
    • It's invalid if at least one thing comes out false
  4. How do you do the invalidity shortcut method?
    • 1. Start with the conclusion if there's only one way to make the conclusion false
    • OR
    • Start with the premises if there's more than one way to make the conclusion false
    • 2. Make the conjunction turn into T→F form
  5. What does Modus Ponens (MP) look like?
    • p→q
    • p
    • //q
  6. What does Modus Tollens (MT) look like?
    • p→q
    • -q
    • //-p
  7. What does Absorption (Abs) look like?
    • p→q
    • //p→(p⋅q)
  8. What does Disjunction Syllogism (DS) look like?
    • pVq
    • -p
    • //q
  9. What does Hypothetical Syllogism (HS) look like?
    • p→q
    • q→r
    • //p→r
  10. What does Simplification (Simp) look like?
    • p⋅q
    • //p or //q
  11. What does Conjunction (Conj) look like?
    • p
    • q
    • //p⋅q
  12. What does Addition (Add) look like?
    • p
    • //pVq
  13. What does Constructive Dilemma (CD) look like?
    • (p→q)⋅(r→s)
    • pVr
    • //qVs
  14. What does Commutation (Comm) look like?
    • (pVq)↔(qVp)
    • OR
    • (p⋅q)↔(q⋅p)
  15. What does Association (Assoc) look like?
    • (pV(qVr))↔((pVq)Vr)
    • OR
    • (p⋅(q⋅r)↔((p⋅q)⋅r)
  16. What does De Morgan's Law (DeM) look like?
    • -(pVq)↔(-p⋅-q)
    • OR 
    • -(p⋅q)↔(-pV-q)
  17. What does Implication (Imp) look like?
  18. What does Transposition (Trans) look like?
  19. What does Equivalence (Equiv) look like?
    • (p↔q)↔((p→q)⋅(q→p))
    • OR
    • (p↔q)↔((p⋅q)V(-p⋅-q))
  20. What does Exportation (Exp) look like?
  21. What does Tautology (Taut) look like?
    • p↔(pVp)
    • OR
    • p↔(p⋅p)
  22. What does Double Negation (DN) look like?
  23. What does Distribution (Dist) look like?
    • (pV(q⋅r))↔((pVq)⋅(pVr))
    • (p⋅(qVr))↔((p⋅q)V(p⋅r))

Card Set Information

Introduction to Logic Exam 2
2014-03-09 18:43:09
suny geneseo intro logic phil 111

Covers stuff for the second exam
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