## BOUNDS—Set or Query the Edit Boundaries

A subset S of a metric space M , d is bounded if it is contained in a ball of finite radius, i. M , d is a bounded metric space or d is a bounded metric if M is bounded as a subset of itself.

In topological vector spaces , a different definition for bounded sets exists which is sometimes called von Neumann boundedness. If the topology of the topological vector space is induced by a metric which is homogeneous , as in the case of a metric induced by the norm of normed vector spaces , then the two definitions coincide. A set of real numbers is bounded if and only if it has an upper and lower bound.

This definition is extendable to subsets of any partially ordered set. Note that this more general concept of boundedness does not correspond to a notion of "size". The element k is called an upper bound of S. The concepts of bounded below and lower bound are defined similarly.

See also upper and lower bounds. A subset S of a partially ordered set P is called bounded if it has both an upper and a lower bound, or equivalently, if it is contained in an interval. Note that this is not just a property of the set S but also one of the set S as subset of P.

A bounded poset P that is, by itself, not as subset is one that has a least element and a greatest element. Note that this concept of boundedness has nothing to do with finite size, and that a subset S of a bounded poset P with as order the restriction of the order on P is not necessarily a bounded poset.

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