ó
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 Z
 d e
 f d „  ƒ  YZ d S(   iÿÿÿÿ(   t   print_functiont   division(   t   Basict   S(   t   Eqt   Ne(   t   BooleanFunctiont   Containsc           B  s5   e  Z d  Z e d „  ƒ Z e d „  ƒ Z d „  Z RS(   sÖ  
    Asserts that x is an element of the set S

    Examples
    ========

    >>> from sympy import Symbol, Integer, S
    >>> from sympy.sets.contains import Contains
    >>> Contains(Integer(2), S.Integers)
    True
    >>> Contains(Integer(-2), S.Naturals)
    False
    >>> i = Symbol('i', integer=True)
    >>> Contains(i, S.Naturals)
    Contains(i, Naturals)

    References
    ==========

    .. [1] https://en.wikipedia.org/wiki/Element_%28mathematics%29
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