R E F E R E N C E S
Boundary 1. something that indicates bounds or limits; a limiting or bounding line. 2. Math. the collection of all points of a given set having the property that every neighborhood of each point contains points in the set and in the complement of the set.
[Urdang, Laurence, ed. Random House Dictionary of The English Language. New York: Random House, 1968.]
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