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# Field of Arbitrary Precision Real Number Intervals

`sage.rings.real_interval_field.``is_RealIntervalField`(x)

  Check if `x` is a `RealIntervalField_class`.

  EXAMPLES:

      sage: from sage.rings.real_interval_field import is_RealIntervalField as is_RIF
      sage: is_RIF(RIF)
      True

`sage.rings.real_interval_field.``is_RealIntervalFieldElement`(x)

  Check if `x` is a `RealIntervalFieldElement`.

  EXAMPLES:

      sage: from sage.rings.real_interval_field import is_RealIntervalFieldElement as is_RIFE
      sage: is_RIFE(RIF(2.5))
      True

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