Logical notation

By | January 10, 2006

Just to remember, here are the most used notation in logical writting (mostly used for integrity rules definition).

  • ε : belongs
  • ⊆ : is include in
  • ∪ : union
  • ∩ : intersection
  • – : is different
  • ∅ : is empty
  • ∧ : and
  • ∨ : or
  • ¬ : is not
  • ∀ : for all
  • ∃ : it exist
  • ≡ : strickly egal to
  • × : cartesian product
  • |: such as
  • {} : ensemble
  • ⇒ : imply
  • I hope it help.

     
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