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Playfair (Martian Crater)
Playfair may refer to: * Playfair (surname) * Playfair (lunar crater) * Playfair (Martian crater) * PlayFair, software that removes Apple's FairPlay DRM file encryption, now succeeded by Hymn *Playfair Project * TS ''Playfair'', a Canadian sail training vessel *Playfair's axiom named after John Playfair *Playfair cipher, a manual encryption technique invented in 1854 by Charles Wheatstone *Playfair Cricket Annual *Playfair Race Course Playfair Race Course (known as the Spokane Interstate Fair from 1901–1935) was the home of horse racing in Spokane, Washington, from 1901 The track started out as a four- furlong (half-mile) flat oval, and expanded to five furlongs () in 1946 ... * Lyon Playfair Library, now called the Abdus Salam Library, at Imperial College London {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Playfair (surname)
Playfair is an English surname which came to England after the Norman Conquest. The name derives from the Old French toponymic surname ''Plouvier'' and came from Plouvien, Brittany. Notable people with the surname include: * Andrew W. Playfair (1790–1868), Canadian politician, son of William *Dylan Playfair (born 1992), Canadian actor * Sir Edward Playfair (1909–1999), British civil servant and businessman * Guy Lyon Playfair (1935 – 2018) British writer, son of I.S.O. Playfair * Henry Playfair (born 1983), Australian rules footballer * Hugh Lyon Playfair (1787–1861), Provost of St Andrews * Ian Stanley Ord Playfair (1894–1972), a general in the British Army and contributing author to British official history of the Second World War * James Playfair (architect) (1755–1794), Scottish architect, brother of John, Robert and William, father of William Henry * Jim Playfair (born 1964), Canadian ice hockey player and coach, brother of Larry * John Playfair (1748–1819), S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Playfair (lunar Crater)
Playfair is a lunar impact crater that is located in the rugged southern highlands on the near side of the Moon. It was named after the Scottish geologist and mathematician John Playfair. It lies along the eastern rim of the eroded satellite crater Playfair G, a formation that is almost twice the diameter of Playfair itself. Playfair is nearly due north of the crater Apianus, and to the southwest of the Abenezra–Azophi crater pair. This crater is oval in shape, being slightly wider along the east–west axis. The rim is somewhat eroded, and tiny craterlets lie along the south and west rims. The interior floor is level and nearly featureless, with the only feature of the minor interest being a pair of tiny craterlets lying just to the east of the midpoint. Playfair is a crater of Nectarian age. |
Playfair (Martian Crater)
Playfair may refer to: * Playfair (surname) * Playfair (lunar crater) * Playfair (Martian crater) * PlayFair, software that removes Apple's FairPlay DRM file encryption, now succeeded by Hymn *Playfair Project * TS ''Playfair'', a Canadian sail training vessel *Playfair's axiom named after John Playfair *Playfair cipher, a manual encryption technique invented in 1854 by Charles Wheatstone *Playfair Cricket Annual *Playfair Race Course Playfair Race Course (known as the Spokane Interstate Fair from 1901–1935) was the home of horse racing in Spokane, Washington, from 1901 The track started out as a four- furlong (half-mile) flat oval, and expanded to five furlongs () in 1946 ... * Lyon Playfair Library, now called the Abdus Salam Library, at Imperial College London {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hymn (software)
FairPlay is a digital rights management (DRM) technology developed by Apple Inc. It is built into the MP4 multimedia file format as an encrypted AAC audio layer, and was used until April 2009 by the company to protect copyrighted works sold through iTunes Store, allowing only authorized devices to play the content. The restrictions imposed by FairPlay, mainly limited device compatibility, have sparked criticism, with a lawsuit alleging antitrust violation that was eventually closed in Apple's favor, and various successful efforts to remove the DRM protection from files, with Apple continually updating its software to counteract such projects. In January 2009, Apple signed deals with all major record labels as well as many independent labels to offer all iTunes music with a DRM-free option. Technicality FairPlay-protected files are regular MP4 container files with an encrypted AAC audio layer. The layer is encrypted using the AES algorithm. The master key required to decrypt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Playfair Project
The Scottish National Gallery (formerly the National Gallery of Scotland) is the national art gallery of Scotland. It is located on The Mound in central Edinburgh, close to Princes Street. The building was designed in a Neoclassical architecture, neoclassical style by William Henry Playfair, and first opened to the public in 1859. The gallery houses Scotland's national collection of fine art, spanning Scottish art, Scottish and international art from the beginning of the Renaissance up to the start of the 20th century. The Scottish National Gallery is run by National Galleries of Scotland, a public body that also owns the Scottish National Gallery of Modern Art and the Scottish National Portrait Gallery. Because of its architectural similarity, the Scottish National Gallery is frequently confused by visitors with the neighbouring Royal Scottish Academy Building (RSA), a separate institution which works closely with the Scottish National Gallery. History The origins of Scotland ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
TS Playfair
TS ''Playfair'' is a traditionally-rigged brigantine training ship operated by Toronto Brigantine Inc., a sail-training Canadian registered charity based in Toronto, Ontario, Canada though as of 2021 it will be based in Hamilton Ontario. ''Playfair'' is used for a youth sail training program on the Great Lakes during the summer months. This program is one of the very few sail training programs where all of the crew except for the captain are in high school (13–19 years old). The summer training is followed by a winter program where youth work through higher levels of training syllabus to become accredited members of the crew the following year. History ''Playfair'' was constructed for Toronto Brigantine Inc. in 1973 as an addition to an already established sail training organization which began operation with the STV Pathfinder in 1962. During the Royal Visit to Canada in 1973, Queen Elizabeth II Elizabeth II (Elizabeth Alexandra Mary; 21 April 1926 – 8 Septemb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Playfair's Axiom
In geometry, Playfair's axiom is an axiom that can be used instead of the fifth postulate of Euclid (the parallel postulate): ''In a plane, given a line and a point not on it, at most one line parallel to the given line can be drawn through the point.'' It is equivalent to Euclid's parallel postulate in the context of Euclidean geometry and was named after the Scottish mathematician John Playfair. The "at most" clause is all that is needed since it can be proved from the remaining axioms that at least one parallel line exists. The statement is often written with the phrase, "there is one and only one parallel". In Euclid's Elements, two lines are said to be parallel if they never meet and other characterizations of parallel lines are not used. This axiom is used not only in Euclidean geometry but also in the broader study of affine geometry where the concept of parallelism is central. In the affine geometry setting, the stronger form of Playfair's axiom (where "at most one" is re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Playfair Cipher
The Playfair cipher or Playfair square or Wheatstone–Playfair cipher is a manual symmetric encryption technique and was the first literal digram substitution cipher. The scheme was invented in 1854 by Charles Wheatstone, but bears the name of Lord Playfair for promoting its use. The technique encrypts pairs of letters (''bigrams'' or ''digrams''), instead of single letters as in the simple substitution cipher and rather more complex Vigenère cipher systems then in use. The Playfair is thus significantly harder to break since the frequency analysis used for simple substitution ciphers does not work with it. The frequency analysis of bigrams is possible, but considerably more difficult. With 600 possible bigrams rather than the 26 possible monograms (single symbols, usually letters in this context), a considerably larger cipher text is required in order to be useful. History The Playfair cipher was the first cipher to encrypt pairs of letters in cryptologic history. Wheat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Playfair Cricket Annual
''Playfair Cricket Annual'' is a compact annual about cricket that is published in the United Kingdom each April, just before the English cricket season is due to begin. It has been published every year since 1948. Its main purposes are to review the previous English season and to provide detailed career records and potted biographies of current players. It is produced in a "pocket-sized" format, being approximately 5×4 in (i.e., about 13×10 cm), so that it is a convenient size for carrying to cricket matches. The front cover of each edition has featured a photograph of a prominent current cricketer. There is a popular myth that this "honour" has a "hex" or "curse" associated with it, as the player featured then invariably has a poor season. Publications The original publisher was Playfair Books Ltd of London, which had its office at Curzon Street when the first edition was published in April 1948; the company relocated soon afterwards to Haymarket. The name Playfair was c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Playfair Race Course
Playfair Race Course (known as the Spokane Interstate Fair from 1901–1935) was the home of horse racing in Spokane, Washington, from 1901 The track started out as a four-furlong (half-mile) flat oval, and expanded to five furlongs () in 1946. The grandstand was on the west, with the home stretch heading south, and the stables were on the east side. The premier races run at the track were the Playfair Mile, Spokane Derby, and the Inland Empire Marathon. The final races were on and the track officially closed the following July. Post-Closure Located in the East Central section of the city between Sprague Avenue and the railroad, the facility assets were auctioned in March 2004, and it was demolished shortly after. The site was bought by City of Spokane in 2004 for $6.3 million, with the intent of partnering with Spokane County for a new sewage treatment facility. The deal soured and was sold in 2009 to SCAFCO, a steel-framing manufacturer. Now owned by SCAFCThe Stone Gr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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