In mathematics, a limit point of a set S in a topological space X is a point x that can be approximated by points of S in the sense that every neighbourhood of x with respect to the topology on X also contains a point of S other than x itself. Note that x does not have to be an element of S. This concept profitably generalizes the notion of a limit and is the underpinning of concepts such as closed set and topological closure. Indeed, a set is closed if and only if it contains all of its limit points, and the topological closure operation can be thought of as an operation that enriches a set by adding its limit points.
Bad lands
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Barren regions, especially in the western United States, wherehorizontal strata (Tertiary deposits) have been often eroded intofantastic forms, and much intersected by canons, and where lack ofwood, water, and forage increases the difficulty of traversing thecountry, whence the name, first given by the Canadian French,Mauvaises Terres (bad lands).
Bad lands meaning & definition 1 of Bad lands.
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