Set-theoretic operations on intervals
Factor handbook > The language > Numbers > Intervals

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interval-contains? ( x int -- ? )

interval-subset? ( i1 i2 -- ? )

interval-intersect ( i1 i2 -- i3 )

interval-union ( i1 i2 -- i3 )

interval-closure ( i1 -- i2 )

integral-closure ( i1 -- i2 )