Descriptive Interpretation - Examples

Examples

A sentence is either true or false under an interpretation which assigns values to the logical variables. We might for example make the following assignments:

Individual constants

  • a: Socrates
  • b: Plato
  • c: Aristotle

Predicates:

  • Fα: α is sleeping
  • Gαβ: α hates β
  • Hαβγ: α made β hit γ

Sentential variables:

  • p "It is raining."

Under this interpretation the sentences discussed above would represent the following English statements:

  • p: "It is raining."
  • F(a): "Socrates is sleeping."
  • H(b,a,c): "Plato made Socrates hit Aristotle."
  • x(F(x)): "Everybody is sleeping."
  • z(G(a,z)): "Socrates hates somebody."
  • xyz(H(x,y,z)): "Somebody made everybody hit somebody."
  • xz(F(x)&G(a,z)): Everybody is sleeping and Socrates hates somebody.
  • xyz (G(a,z)H(x,y,z)): Either Socrates hates somebody or somebody made everybody hit somebody.

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