cover

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Related to cover position: shorted

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 ?
A lot of people were trying to get out all at once, going short trying to cover positions, liquidating longs," said Bart Melek of TD Securities.
The jobs would cover positions for customer service, sales and claims departments.
The jobs offered cover positions such as engineer, beauty consultant, driver, forklift truck driver, gardener, storekeeper, technician, chef, waiter/waitress, shop assistant, cashier, security guard and cleaner.
Shelly says this started with a flurry in buying activity while supplies were tight, which drove up prices and forced traders to cover positions, which ultimately moved prices up even further.
If the IPS can't cope with demand now, then it shouldn't have cut a sizeable number of production staff at the Newport Passport Office who could cover positions at peak periods.
If extra margin to cover positions within the market isn't available, the trades can be closed out as soon as funds run out.
The Scottish international midfielder said: "We've had to field a lot of young players to cover positions.
Mr Leeson later came up with the theory that his immediate bosses, who should have been questioning his margin calls for extra cash to cover positions were too embarrassed to enquire too closely because it could have exposed their lack of knowledge about the futures and options markets.