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 ?
Fans voted for their favourite Manics cover versions for the new release, with Last Christmas being added at the last minute.
To prove this point, I have just created the "Cover Versions at Number One" indicator of stock market prospects.
THE next two projects from Stereophonics stable are cover versions from two of Britain's biggest exports.
The duo's songbook was widely plundered for cover versions. Standouts are Another Day Another Heartache by 5th Dimension, Can I Get To Know You Better by The Turtles, Take Me For What I'm Worth by The Searchers, the Mamas and Papas' You Baby, and Barry McGuire's antiwar anthem Eve Of Destruction.
Perhaps he should consider a cover version for his next amorous mail out?
They have recorded a cover version of The Street's Never Went to Church, which will be the B-side when the original track, from the album The Hardest Way to Make an Easy Living, is released as a single on June 5.
Apparently, the boy band performed several cover versions and that prompted our reviewer Emma Christie to note: "By cover version number eight I was growing just a little restless.
She quickly got back on track with a haunting version of Wolf and a brilliant cover version of Pavement's Spit On A Stranger.
E'VOKE: Me Sing You (Eternal) Cover version of an 80s rock ballad by a couple of ladies who had bit parts in Eastenders.
In 1978, Swedish singer Harpo released a cover version as a single.
COVER VERSION She puts hand in way LIP SERVICE Cheryl smiles at TV awards LOOKS SWELL Cheryl's lips are much plumper
Hallmark hits include Hats Off To Larry, The Swiss Maid and Hey Little Girl, while later highlights are the Lynne-produced I Go To Pieces and a cover version of Out Of Time, recorded with Heartbreakers frontman Tom Petty.