A Haskell type for intervals; documentation

  A Numeric.Interval.Interval is a closed, convex set of floating point values.
  .
  This package does not control the rounding mode of the end points of the
  interval when using floating point arithmetic, so be aware that in order to
  get precise containment of the result, you will need to use an underlying
  type with both lower and upper bounds like CReal.
 .
 .
 This package provides the documentation for a library for the Haskell
 programming language.
 See http://www.haskell.org/ for more information on Haskell.