Open Interval Sign Video
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Definition
If X is a set and , is an order relation on X, and if a<b, we use the notation (a, b) to denote the set {x|a < x < b}; it is called an open interval in X. If this set is empty, we call a the immediate predecessor of b, and we call b the immediate successor of a.
Source: Topology (second edition) by James R. Munkres
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