Clarity is hard and crucial

• We all know this, but Jackson helps us think about it more clearly

  • Moods
  • Designations vs. definitions
    • Designations are the atomic phenomena
      • e.g., genetic mother
    • Definitions define terms in terms of designations and other previously defined descriptions
      • e.g., genetic child of
    • Refutable descriptions can in principle be disproven
      • ?m,x?Mother(x,m)??Mother(m,x)
      • Can’t do this with definitions

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