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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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Tour Operators :: Travel
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In dozens of calls, Palins and aides pressed for trooper's removal
By SERGE F. KOVALESKI Fri, 10 Oct 2008 05:37:52 -0000
Alaska's former public safety commissioner was contacted three dozen times about firing one of his troopers, interviews and documents show.
Obama seeks to project a cool and steady temperament
By Patrick Healy Fri, 10 Oct 2008 03:17:09 -0000
Obama keeps firm control of his public image: He is willing to risk appearing a bit remote if it means that at the same time he appears unruffled by pressure and crisis.
Fictitious donors found in Obama finance records
By MICHAEL LUO AND GRIFF PALMER Fri, 10 Oct 2008 05:37:52 -0000
Some of the obviously questionable donations raise concerns about whether the Barack Obama campaign is adequately vetting donors.
Obama, purse swelling, plans half-hour tv ad
By Jim Rutenberg and Brian Stelter Fri, 10 Oct 2008 04:12:02 -0000
Senator Barack Obama has purchased a half-hour of prime-time network television for a campaign informercial to be broadcast on Oct. 29.
2 endorsements of nuclear power, but sharp differences on details
By LARRY ROHTER Fri, 10 Oct 2008 05:37:52 -0000
Both John McCain and Barack Obama endorse nuclear energy, although to differing degrees, as part of their strategy to wean the United States from its dependence on foreign oil.
McCain joins attacks on Obama over radical
By ELISABETH BUMILLER AND PATRICK HEALY Fri, 10 Oct 2008 05:37:52 -0000
The tone of the campaign on both sides on Thursday suggested negative campaigning would continue in the final weeks before Election Day.
Ecotourisn and Adventure Specialists - Offers ecotours, including extreme activities and hands-on projects. Describes typical programs, staff credentials, lodging and transportation.
Great Trips - Itineraries and overview of visits to Belize, Costa Rica, the Mexican Yucatan, the Tikal ruins in Guatemala, Copan and the Bay Islands in Honduras.
Meta Description: [ Great Trips to all areas of Belize: from cayes to Cayo district, mainland coast from Corozal to Palencia. Costa Rica, the Mexican Yucatan, Tikal in Guatemala and Copan, Bay Island in Honduras. ]
Journey Latin America - Based in London. Specialist in tours to South and Central America, including custom itineraries and escorted trips. Gives background information for each country.
Maya Temple Tours - Based in San Pedro Sula, Honduras. Offers tours of Mayan religious sites in Central America and Mexico. Describes staff and destinations.
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Mayapan - Describes trips covering southern Mexico, Honduras, El Salvador and Guatemala, with rates, accommodations, and routes. [English/Spanish/German]
Mayatour - Offers tours with expert archaeological guides, professional drivers and comfortable vehicles. Provides photos, day-by-day descriptions, and prices for tours.
Mesoamerican Ecotourism Alliance - A group of local sustainable tourism orgnizations offers nature and cultural tours throughout Central America and southern Mexico. They give a schedule of trips, sample itineraries, and a list of partners.
Meta Description: [ Experience ecotourism in Mesoamerica - Unique ecotours to Mexico and Central America with a variety of activities including white water rafting, trekking, snorkeling, birding and archeology sites including Tikal and Copan. ]
Nature Tours - Trip itineraries and information on holiday travel throughout Central America.
Meta Description: [ Nature Tours provides information on vacations and tours to Central America within the countries of Belize, Costa Rica, Guatemala, Mexico, and Panama, with activities such as white water rafting, surfing, bird watching, site seeing volcanoes, rain forests, and exotic animals. ]
Quetzaltrekkers - Nonprofit raising funds by offering hiking and camping trips in Guatemala and Nicaragua. Describes typical itineraries and education projects in Quetzaltenango.
Tropical Discovery Services - Offices in Guatemala and Belize. Provides sample itineraries and information on company and staff.
Meta Description: [ Spend your vacation in Central America - we offer tours and travel packages in Belize, Costa Rica, Guatemala, Honduras and Nicaragua.
Couple this with a noble and warm hearted population and you can be assured the vacation of a lifetime! ]
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Tropical Eco-Tours - Nature-oriented tours in Costa Rica and Panama. Provides sample itineraries, rates, and company information.
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