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 ?
1 will be one of two possibilities - either the Pop Idol 12's version of Happy Xmas (War Is Over) which satisfies many winning criteria - ballad, cover version and Christmas content.
While the suits have been busy wining and dining the critics - most of whom aren't real journalists - Gabrielle Aplin has been quietly rising up the charts with her brilliant cover version of 'The Power of Love'.
London, Sept 22 (ANI): Muse's rendition of Feeling Good has been named the greatest cover version of all time.
Nevertheless, I think it was unfair of Total Guitar magazine to announce this week that Ms Dion is responsible for the worst cover version ever.
So she mentioned the cover versions, the 12 number-ones, the lighting, the dance routines, the fans' reactions ( she just didn't think it was brilliant.
Their cover versions, ranging from Green Day to Muddy Waters, are picture perfect yet their original numbers lean heavily on the likes of the Chili Peppers and Foo Fighters.
The new set includes B-sides, alternate versions of familiar songs, a handful of never- before-heard cuts, live performances and a great many cover versions of other people's hits.
An insider said: "The girls haven't been completely happy with Simon's cover versions.
With b-sides, live tracks and cover versions compiled onto two CDs, newcomers will find this stopgap a fascinating glimpse of the band; especially their great lost single, I Want an Alien for Christmas.
With an opening tribute to Eva Cassidy and cover versions of Love Cats, On The Road Again, plus hit after hit from the album Call Off The Search, there was plenty of scope.
But Manic Street Preachers have always had a soft spot for unusual cover versions, and are even including an acoustic version of the Wham
Rather than presenting an original cast album and waiting for the inevitable pop cover versions, John has masterminded a majestic tribute album to pave the way for his musical.