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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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Travel Agents :: Travel Services
Cultural Festivals - Arranges joint experiences for sports and arts participants, as well as professional conferences. Provides photos and testimonials. Also has office in Toronto.
Meta Description: [ Canada Cuba Arrainging facilitaing Arts, Choir, Band, Orchestra, Dance, Sports, Basketball, Baseball, Soccer, Volleyball, Hockey, Field Hockey, Wrestling events conference to educational institute, high school, college, university, organization from Canada, USA, Europe to Cuba, Havana ]
Common Ground Education and Travel Services - US Treasury licensed travel providers. Also organizes education and humanitarian visits. Gives information on staff and sample itineraries. [English/Spanish]
Meta Description: [ Specialists in people to people travel ]
Cuba Education and Solidarity Tours - From Canada but open to people from all countries. A comprehensive overview of all aspects of Cuban life, politics, culture, economy and society.
Meta Description: [ Cuba education travel, tours and books. See Cuban life: political, economic, cultural, historical and social. You get to know the real Cuba and its people. We provide licensed and legal Cuba travel for U.S. citizens. ]
Cuba Education Tours - Canada-based company organizes trips for students and educators. Provides itineraries, overview of services and local partners, and general information about travel.
Meta Description: [ Cuba and Venezuela tours and travel for U.S. and Canadian high school, college, university, graduate students and educators. ]
Cuban Adventures - A 15-day small group tour of Cuba for the budget minded traveller interested in culture and society, with family stays. Gives sample a sample itinerary, calendar of open dates, and information about the company.
Meta Description: [ Small group tours of Cuba for the budget traveller, using family homestays and local tour guide throughout. Suited to those interested in Cuban culture, fun and adventure. ]
Cuban Adventures Inc. - Offers guided tours focusing on culture, jazz, and cigars, as well as customized packages. In English, French, and Spanish.
CubaNow.org - Education and research travel from the US to Cuba. Includes references, travel information, and sample itineraries.
EduToursToCuba - Offers educational trips for high school and college students, as well as senior citizens and professionals. Offers testimonials, mission statement, payment and registration options and contact information.
Meta Description: [ Cuba Education Tours for universities, colleges, and high schools. University Educational study travel to Cuba. Trip, tour, or travel to cuba to study or education for University, college, or school students teacher, professor, staff, association, or groups. For USA Cuba and Canada Cuba education... ]
PlazaCuba - Offers travel workshops on Cuban music, dance, folkloric dance, folkloric percussion, and arts and culture. Includes descriptions of upcoming programs and backgrounds of staff.
Meta Description: [ Plazacuba.com offers music and dance workshops and cultural travel in Cuba. We offer workshops and travel in Cuba areas such as Cuban music, salsa dance, folkloric dance, folkloric percussion, and arts and culture. ]
Real Cuba - Providing cultural and heritage tours throughout the island. Offers a variety of tours and packages, includes map, prices, online booking request form and contact information.
Meta Description: [ Holiday in Cuba and join others doing special tours. We have small groups, individuals, and families looking for people to join their proposed tours. Flexible schedules to adjust to new members. ]
Sprachcaffe Cuba Travel - Provides both individual and group packages. Offers a variety of tours and packages, accommodations and contact information. In English, Spanish, French, and Portugese.
