# 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 periodicals archive ?
Formula: For defined curls and extra bounce, this activator claims to deliver weightless results using a silicone and sulphate-free formula.
Heather Budd, who curls, and whose sister curls, and also her brother, and her parents, and her grandparents, fielded several curling questions from curling neophytes alongside her fiance, Drew Harden, both from Woodville, Ontario.
The products, according the company, are infused with coconut oil to help hydrate curls from the roots to the ends while also detangling curts.
Curls are officially back in fashion THERE'S finally some good news for those who spend half their life struggling to control a mass of curly hair.
Here are Michele Scott-Lynch's top tips on embracing your natural curls.
uk) Made from natural ingredients from an eco farm in Italy, OWAY's Curly Potion helps nourish hair to give the perfect mix of support, bounce and definition to curls.
ClickPress, Mon Jun 29 2015] Declare independence from chemically treated hair and relaxers this July with CURLS ON FLEEK, a new product from Hello Riot.
Unilever has launched "Dove Hair: Love Your Curls," a campaign and film aimed at encouraging women to take pride in curly hair.
Its patented design delivers instant curls with less effort.
LOOSE curls, a la the newly brunette Reese, Witherspoon are a doddle with Babyliss' ' new wonder product, Perfect Curl.
IT'S the age-old hair conundrum - women blessed with a head full of natural, tumbling curls want straight tresses, while those graced with poker-straight locks long for a bouncier bonce.
Whether you're craving loose curls or tighter ones, Ouidad has the answer.

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