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.
Tinfoil
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paranoid...as in M. Night Shama-lama-ding-dongs movie Signs, the kids put tinfoil hats on their heads to protect them from the aliens.
Tinfoil meaning & definition 1 of Tinfoil.
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Quasi-mystical aluminium foil that (if worn in the ears) can filter out reception of most left and right wing chaff.
Tinfoil meaning & definition 2 of Tinfoil.
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Foil made of aluminium or a similar grey metal, used especially for covering or wrapping food.
Tinfoil meaning & definition 3 of Tinfoil.
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