closed covering

closed covering

[¦klōzd ′kəv·ər·iŋ]
(mathematics)
A closed covering of a set S in a topological space is a collection of closed sets whose union contains S.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Conventional trim panels use sandwich panels with closed covering layers, which are a big acoustic drawback.