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  •                             a is an element of set A
  •                            a is not an element of set A
  •                                   Empty or null set
  •          C                          Complex numbers
  •                                  Nature numbers
  •                                  Rational numbers
  •                                   Real numbers
  •                                   Integers
  •                                   Riemann zeta function


Either mathematics is too big for the human mind or the human mind is more than a machine. (Kurt Gödel )