Deductive Arguments

What is an Argument

• it is a set of statements that has a

  • Premise + Premise = Conclusion
  • the premise must be true so that the conclusion is true

What is a Deductive Argument

• It is Valid

  • Valid Arguments

    • if a argument is valid
      • it has to have the truth preserved
    • However arguments can be invalid even if the premise is true
      • but the conclusion is false

  • Thats a true statement ⇒ that’s a valid argument

  • Some arguments look valid but are not

    • All A are B
      • X is a B
      • X is an A (NOT TRUE) because As are in the set of Bs, Bs are bigger than As therefore the argument is invalid

• Example

  • Alsl A are B

    • x is an A
      • ⇒ X is a A and B

  • No A are B

    • x is an A
      • ⇒ X is not a B