Data.Interval
data Interval a
(...)
(+/-)
interval
empty
singleton
symmetric
hull
inf
sup
width
valid
invalid
isEmpty
isNonEmpty
singular
member
notMember
toList
contains
isSubsetOf
adjacent
mergeable
overlaps
(<!)
(<=!)
(==!)
(/=!)
(>!)
(>=!)
(<?)
(<=?)
(==?)
(/=?)
(>?)
(>=?)
(||?)
(++?)