HIGHERMATHEMATICS

                 SYMBOLS

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        N = the set of Natural numbers

  Z or I = the set of Integer

Z+ or I = the set of Positive Integer

        Q = the set of rational number

        R = the set of Real number

     ⇒   = Implies

⟺      = is equivalent to

{ }        = set

∈        = belongs to

  :        = such that

   ⊂     = is a subset of

   ⊃     = is a superset of

   ∪     = union

   ∩     = intersection

   ∅    = the empty set

   ∃     = there exists

   ∀    = for all / every

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