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In logic, a logical constant or constant symbol of a language L {\displaystyle {\mathcal {L}}} is a symbol that has the same semantic value under every interpretation of L {\displaystyle {\mathcal {L}}} . Two important types of logical constants are logical connectives and quantifiers. The equality …

Stone tools have been used throughout human history but are most closely associated with prehistoric cultures and in particular those of the Stone Age. Stone tools may be made of either ground stone or knapped stone, the latter fashioned by a craftsman called a flintknapper. Stone has been used to m…

In physics, a force is an action that can cause an object to change its velocity or its shape, or to resist other forces, or to cause changes of pressure in a fluid. In mechanics, force makes ideas like 'pushing' or 'pulling' mathematically precise. Because the magnitude and direction of a force are…

In the colonial societies of the Americas and Australia, a quadroon (/kwɑːˈdruːn/ kwah-DROON) or quarteron (quarter-caste in the United Kingdom and Australia) was a person with one-quarter African or Aboriginal ancestry, and three-quarters European ancestry. Similar classifications were octoroon for…

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Euronext N.V. (short for European New Exchange Technology) is a European bourse that provides trading and post-trade services for a range of financial instruments. It is registered in Amsterdam but its operational headquarters are located in Paris. It operates major stock exchanges in eight countrie…

The Scottish Football Association Challenge Cup, commonly known as the Scottish Cup (Scottish Gaelic: Cupa na h-Alba), is an annual association football knock-out cup competition for men's football clubs in Scotland. The competition was first held in 1873–74. Entry is open to all 122 clubs with full…

Comcast Corporation, formerly known as Comcast Holdings, is an American multinational mass media, telecommunications, and entertainment conglomerate. Comcast's corporate headquarters is at the Comcast Center in Philadelphia, while NBCUniversal, Comcast's New York operations and other major Comcast a…

Haiti, officially the Republic of Haiti, is a country in the Caribbean on the island of Hispaniola in the Caribbean Sea, east of Cuba and Jamaica and south of the Bahamas. It occupies the western side of the island, which it shares with the Dominican Republic. Haiti is the third largest country in t…

Sound is a phenomenon in which pressure disturbances propagate through a transmission medium. In the context of physics, it is characterised as a mechanical wave of pressure or related quantities (e.g. displacement), whereas in physiological-psychological contexts it refers to the reception of such …