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.
I'm not sure
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Alternative: I dont know
In conversation, when the person speaking to you wants you to feel like youre part of the conversation, but doesnt want to give you an opening. This conveniently allows the speaker to continue to ramble on about something trivial while the other person can only stand there and take it.
I'm not sure meaning & definition 1 of I'm not sure.
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