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 ?
However, I took care there should be no further scorning at my good nature: ever since, I've been as stiff as herself; and she has no lover or liker among us: and she does not deserve one; for, let them say the least word to her, and she'll curl back without respect of any one.
Now, I am a fidgety little man, and always love to have something in my fingers; so that, being debarred from my wife's curls, I looked about me for any other plaything.
Even your fair hand could not manage a curl more delicately than mine.
asked one tormentor, tweaking a curl that strayed out from the cushions.
The hair, dark, and still damp from the outdoor air, lay in loose waves about the forehead and curved back over the ears in wonderfully becoming lines, with softening little curls here and there.
And Miss Polly pulled the locks so tightly back that the last curl lay stretched dead at the ends of her fingers.
Then, whimpering again, and at intervals biting the curls, and stopping to look how much was bitten off, 'It's a shame
A gentleman coming in, Miss Bella, with a short and sharp exclamation, scrambled off the hearth-rug and massed the bitten curls together in their right place on her neck.
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.
And that one wee curl, always looking as if it were going to drop, but never dropping, is delicious.
He had certainly seen everything and with each curl of his lip, he declared that it amounted to nothing.
And you've got a little curl loose," he said, carefully turning her head round.

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