Curl

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curl

Maths a vector quantity associated with a vector field that is the vector product of the operator ∇ and a vector function A, where ∇ = i∂/∂x + j∂/∂by + k∂/∂z, i, j, and k being unit vectors. Usually written curl A, rot A

Curl

 

of a vector field A, the vector characteristic of a “rotating component” of field A. The curl is represented by the symbol rot A. It can be interpreted in the following manner: Let A be the velocity field of a fluid flow. At a given point of the flow we place a small wheel with blades and orient its axis in the direction of rot A at that point. Then the angular velocity of the wheel’s rotation from the action of the current will be maximum, and its value will equal (| rot A |)/2. If the field A has the coordinates P(x, y, z), Q(x, y, z), and R(x, y, z), then the curl has the coordinates

E. G. POZNIAK

curl

[kərl]
(forestry)
A block of timber cut from a crotch for cutting into veneers.
(materials)
A defect of paper caused by unequal alteration in the dimensions of the top and underside of the sheet.
(mathematics)
The curl of a vector function is a vector which is formally the cross product of the del operator and the vector. Also known as rotation (rot).

curl

A winding, swirling, or circling in the grain of wood, usually obtained from the crotch or fork of a tree; also see fiddleback.

Curl

(1) A programming environment for developing rich Internet applications (RIAs) from Curl, Inc., Cambridge, MA (www.curl.com). Conceived at MIT, Curl combines HTML markup with an object-oriented programming language. The user's machine requires the Curl runtime engine and browser plug-in for execution. The first Curl implementation was released in 2002. See RIA.

(2) (cURL) A command line utility for executing functions with URL-oriented protocols such as FTP and HTTP. Pronounced "C-URL," there are versions for Unix, Linux, Windows, Mac and other operating systems. For more information, visit http://curl.haxx.se.
References in classic literature ?
Jerry roused to Skipper's entrance under the blanket, and, quite as if it were a long-established custom, curled in between his arm and side, and, after one happy sniff and one kiss of his cool little tongue, as Skipper pressed his cheek against him caressingly, dozed off to sleep.
What with her splendid fleece of golden curls, her great, brilliant blue eyes, her exquisitely tinted face, her dimpled hands and arms, every member of the audience must have felt it was worth the ten cents he had paid merely to see her.
Miss Temple passed her handkerchief over her lips, as if to smooth away the involuntary smile that curled them; she gave the order, however, and when the first class could take in what was required of them, they obeyed.
"Even your fair hand could not manage a curl more delicately than mine.
As if I would!" And Miss Polly pulled the locks so tightly back that the last curl lay stretched dead at the ends of her fingers.
And that one wee curl, always looking as if it were going to drop, but never dropping, is delicious.
He waved his hands like a man of the world, who dismisses religion and philosophy, and says "Fudge." He had certainly seen everything and with each curl of his lip, he declared that it amounted to nothing.
The dogs got nothing, though they watched with wistful mien from a distance, sitting up in the snow, their tails curled around their paws.
He was tall and straight as a lance, though of a great age, for his hair, which curled from under his velvet cap of maintenance, was as white as the new-fallen snow.
On the few occasions when anything amused him, he curled up a little at the corners of the lips, nothing more.
His cheeks and chin were in the bluest bloom of smooth shaving; his nose was short Roman; his lips long, thin, and supple, curled up at the corners with a mildly-humorous smile.
And never a flake That the vapour can make With the moon-tints of purple and pearl, Can vie with the modest Eulalie's most unregarded curl - Can compare with the bright-eyed Eulalie's most humble and careless curl.