In mathematics, an operator is a function, usually of a special kind depending on the topic. For instance, in linear algebra an "operator" is a linear operator. In analysis an "operator" may be a differential operator, generalizing the ordinary derivative, or an integral operator, generalizing ordinary integration. Often, an "operator" is a function that acts on functions to produce other functions; or it may be a generalization of such a function, as in linear algebra, where some of the terminology reflects the origin of the subject in operations on the functions that are solutions of differential equations. One often thinks of an operator as dynamic, changing something into something else, whence the name; but this is only a way of thinking and not a formal definition.

An operator name or operator symbol is a notation that denotes a particular operator. When there is no danger of confusion, an operator name or operator symbol may be referred to more briefly as an "operator". Strictly speaking, however, the operator is a mathematical object and not the syntactic entity that denotes it. The reason for identifying it with its notation is that there are some operators that have come to have standard notations.

An example of an operator, specifically a differential operator, is the derivative itself. The corresponding operator name D, when placed before a differentiable function f, indicates that the function is to be differentiated with respect to the variable.

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US tour operators and travel suppliers gearing up for eventual return to Cuba http://bit.ly/8dapSG (via @hharteveldt) EU Citizens: Go now!
TransWorld (TransWorld) Fri, 18 Dec 2009 00:29:41 -0000
US tour operators and travel suppliers gearing up for eventual return to Cuba http://bit.ly/8dapSG (via @hharteveldt) EU Citizens: Go now!
Tour operators in D.C., Cuba videochat about future of travel (source: USATODAY) : While they wait to see if Co.. http://bit.ly/7gNYTT
adventure_girls (Adventure Girl) Thu, 17 Dec 2009 20:33:25 -0000
Tour operators in D.C., Cuba videochat about future of travel (source: USATODAY) : While they wait to see if Co.. http://bit.ly/7gNYTT
#News #Travel Tour operators in D.C., Cuba videochat about future of travel (source: USATODAY) http://bit.ly/5mHoQL
247dotpt (Joao Mesquita) Thu, 17 Dec 2009 19:54:42 -0000
#News #Travel Tour operators in D.C., Cuba videochat about future of travel (source: USATODAY) http://bit.ly/5mHoQL
Phew. Relieved for @British_airways , consumers, specialist tour operators who could have gone out of business + some destination countries.
DeeEdwards (Dee Edwards) Thu, 17 Dec 2009 18:22:53 -0000
Phew. Relieved for @British_airways , consumers, specialist tour operators who could have gone out of business + some destination countries.
RT @hharteveldt US tour operators and travel suppliers gearing up for eventual return to Cuba http://bit.ly/8dapSG
HugosCurls (Hugo's Curls) Thu, 17 Dec 2009 17:02:47 -0000
RT @hharteveldt US tour operators and travel suppliers gearing up for eventual return to Cuba http://bit.ly/8dapSG
RT @USATODAY Tour operators in D.C., Cuba videochat about future of travel http://usat.me?37054868
MayneTravel (Laurel Mayne) Thu, 17 Dec 2009 16:51:58 -0000
RT @USATODAY Tour operators in D.C., Cuba videochat about future of travel http://usat.me?37054868

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