cover

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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 periodicals archive ?
The material for cover-ups varies enormously, but most is cotton-based and can be a solid weave or transparent, almost gauze-like.
It should go without saying that the ultimate test will be whether the church addresses the cover-ups by church leaders that enabled abusers in Boston, Worcester and other dioceses across the country.
Ashley Paige has produced sexy knits for the stars, with designs which you may recognize from the pages of Seventeen, InStyle and other top magazines: now under one cover are not just photos but how-to instructions for knitted swimsuits, tops, and cover-ups for beach and bedroom alike.
I stripped down to my swimsuit and was waiting lot my friends to take off their cover-ups.
Sequinned shrugs and lace capes make great cover-ups, as do soft fur shrugs.
on Monday completed the filing of recall reports on defective vehicles and defect cover-ups found since March last year, with the number of vehicles subject to recall totaling 2.
The series, which alleged bribery, cover-ups, and other malfeasance, was never challenged on the facts.
It follows his life during long years of training to become a churchman, the loneliness of seminary life, homesickness, and his aghast reaction to church scandals and cover-ups.
The discussion will include cover-ups relating to the Hiroshima and Nagasaki bombings.
If, however, you are shying away from revealing so much flesh remember that many bikinis come with matching sarongs and cover-ups.
So begins a television comedy of cover-ups and crime starring, of all things, a Chevrolet.
95) exposes a trail of pressure from the biotech industry and governmental cover-ups that have put certain GM foods on the market today.