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In mathematics, descriptive of a set of data for which an operation (such as addition or multiplication) done on any members of the set gives a result that is also a member of the set.

For example, the set of even numbers is closed with respect to addition, because two even numbers added to each other always give another even number.


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Silently he moved north past the gateway which was closed by a massive gate which effectively barred even the slightest glimpse within the city beyond.
Questions still insoluble, and forever closed against human curiousity!
The young man with his hat slouched over his eyes, still leaning on the arm of the officer, and still wiping from time to time his brow with his handkerchief, was watching in a corner of the Buytenhof, in the shade of the overhanging weather-board of a closed shop, the doings of the infuriated mob, a spectacle which seemed to draw near its catastrophe.
 
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