covering

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covering

[′kəv·riŋ]
(mathematics)
For a set A, a collection of sets whose union contains A. Also known as cover.
References in classic literature ?
The car, which was of a circular form and fifteen feet in diameter, was made of wicker-work, strengthened with a slight covering of iron, and protected below by a system of elastic springs, to deaden the shock of collision.
Suddenly a hand reached out and pulled the fur over me, shortly afterwards adding another to my covering.
In the midst of them marched four men, one preceding the other at regular intervals of eight or ten feet, with poles of a corresponding length, extending from shoulder to shoulder, to which were lashed with thongs of bark three long narrow bundles, carefully wrapped in ample coverings of freshly plucked palm-leaves, tacked together with slivers of bamboo.
As I passed through the noisy throng, which by this time completely environed the Ti, I looked with fearful curiosity at the three packages, which now were deposited upon the ground; but although I had no doubt as to their contents, still their thick coverings prevented my actually detecting the form of a human body.
After first apologising--in an excellent selection of English words-- for the liberty which he had taken in disturbing me, the Indian produced a small parcel the outer covering of which was of cloth of gold.
Undoubtedly it was oiled silk on the outside, and through the almost transparent covering could be seen the small arrows, or darts, used in the blow gun.
But all these are permanently lodged in their fleshy covering, as the human fingers in an artificial covering.
He said, "I differed indeed from other YAHOOS, being much more cleanly, and not altogether so deformed; but, in point of real advantage, he thought I differed for the worse: that my nails were of no use either to my fore or hinder feet; as to my fore feet, he could not properly call them by that name, for he never observed me to walk upon them; that they were too soft to bear the ground; that I generally went with them uncovered; neither was the covering I sometimes wore on them of the same shape, or so strong as that on my feet behind: that I could not walk with any security, for if either of my hinder feet slipped, I must inevitably fail.
Having done this he hurriedly undid his girdle, opened out his fur coat, and having pushed Nikita down, lay down on top of him, covering him not only with his fur coat but with the whole of his body, which glowed with warmth.
Above the left eyebrow was a wound--a deep gash from which the blood flowed, covering the whole left side of the face and neck and saturating his light-gray shirt.
A little fearfully now, Pollyanna felt her way to these bags, selected a nice fat soft one (it contained Miss Polly's sealskin coat) for a bed; and a thinner one to be doubled up for a pillow, and still another (which was so thin it seemed almost empty) for a covering.
To this arrangement, Marmaduke objected the heavy snows that lay for months, frequently covering the earth to a depth of three or four feet.