cover

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Related to covered: Covered call

cover

1. woods or bushes providing shelter or a habitat for wild creatures
2. 
a. a blanket used on a bed for warmth
b. another word for bedspread
3. Philately
a. an entire envelope that has been postmarked
b. on cover (of a postage stamp) kept in this form by collectors
4. Pop music a version by a different artist of a previously recorded musical item
5. Cricket
a. the area more or less at right angles to the pitch on the off side and usually about halfway to the boundary
b. (as modifier): a cover drive by a batsman
c. a fielder in such a position
6. Ecology the percentage of the ground surface covered by a given species of plant
7. break cover (esp of game animals) to come out from a shelter or hiding place

Cover

In reinforced concrete, the thickness of concrete over-lying the steel bars nearest the surface. An adequate layer is needed to protect the reinforcement from rusting and from fire.

Cover

 

(or covering), a collection of point sets (geometric figures) whose union forms or contains a given set (or given figure). For example, the diagonal of a rectangle divides it into two triangles that form a cover of the given rectangle. Finite covers—that is, covers consisting of a finite number of elements —are usually considered. If the diameter of each of the sets of a cover is smaller than a given positive ∊, the cover is called an ∊-cover.

For any ∊ > 0, a bounded region permits of a finite ∊-cover by closed sets with at most three sets intersecting at a time, but it permits of no such cover, for a sufficiently small ∊, with only two sets intersecting at a time. Thus, a town square can be covered with arbitrarily small paving blocks in such a way that the stones in the pavement will border only in threes; borderings in threes cannot be avoided. Similarly, when a space is filled with brickwork, the bricks can be made to border only in fours; the borderings cannot be only in threes. Hence, the importance of the concept of the multiplicity of a cover. We say that the multiplicity of a cover of a given set does not exceed n if every point of the set belongs to no more than n sets of the cover. Thus, the multiplicity of finite covers makes it possible to characterize the number of dimensions of a space. In topology, covers are a powerful means of investigating various geometric properties of sets.

P. S. ALEKSANDROV

cover

[′kəv·ər]
(mathematics)
An element, x, of a partially ordered set covers another element y if x is greater than y, and the only elements that are both greater than or equal to y and less than or equal to x are x and y themselves.
also covering
(mining engineering)
The thickness of rock between the mine workings and the surface.

cover

1. In reinforced concrete, the least distance between the surface of the reinforcement and the outer surface of the concrete.
2. That part of a tile or shingle which is covered by the next course.
3. The concrete (or concrete-like material) which covers steel reinforcement to protect the steel from possible fire damage or corrosion.

cover

i. An area on the ground covered by imagery, photograph, mosaic, etc.
ii. The protection of friendly forces (ground, maritime, or air) by friendly aircraft and/or by EW (electronic warfare) aircraft.
iii. That which conceals or protects, such as darkness, a topographical feature, a bank of clouds, a shell barrage, or a deceptive move.
References in classic literature ?
It was studded with islands which, like the alluvial bottoms, were covered with groves of cotton-wood, thickets of willow, tracts of good lowland grass, and abundance of green rushes.
On his head, which was thinly covered with lank, sandy hair, he wore a cap made of fox-skin, resembling in shape the one we have already described, although much inferior in finish and ornaments.
This point is said to present one of the most beautiful scenes on the Columbia; a lovely meadow, with a silver sheet of limpid water in the center, enlivened by wild-fowl, a range of hills crowned by forests, while the prospect is closed by Mount Hood, a magnificent mountain rising into a lofty peak, and covered with snow; the ultimate landmark of the first explorers of the river.
About thirty miles above Point Vancouver the mountains again approach on both sides of the river, which is bordered by stupendous precipices, covered with the fir and the white cedar, and enlivened occasionally by beautiful cascades leaping from a great height, and sending up wreaths of vapor.
And when the children ran in that afternoon, they found the Giant lying dead under the tree, all covered with white blossoms.
The straight road was nearer but little used and had no stakes, or only poor ones covered with snow.
The horse was evidently exhausted, his hair had all curled up from sweat and was covered with hoar-frost, and he went at a walk.
A few moments later, the three fellow-travelers had ensconced themselves in the projectile, and screwed down the plate which covered the entrance-aperture.
The whole island is covered with wood; but from the dryness of the climate there is no appearance of luxuriance.
The carriages, posts, people, everything that was to be seen was covered with snow on one side, and was getting more and more thickly covered.
Before I had quitted your apartment, on a sensation of cold, I had covered myself with some clothes, but these were insufficient to secure me from the dews of night.
He wants to face us out of sight and reason, and make us think the head of a red-skin is a stone covered with the autumn leaf; or he has some other devilish artifice in his mind