plural of covering number

(topology) A theorem which states that for any open covering of some given set in Euclidean n-space there is an open subcovering (of that same set) which is countable.

plural of window covering.

Material, including blinds, shades, curtains, and shutters, used to cover a window for the purpose of controlling sunlight, providing additional weatherproofing, ensuring privacy, or for aesthetic reasons.

plural of edge covering number

plural of face covering

Anything used by a person to cover their face, the nose and mouth in particular, such as a face mask or scarf.

present participle of cover ground