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In computability theory, the Ackermann function, named after Wilhelm Ackermann, is one of the simplest and earliest-discovered examples of a total computable function that is not primitive recursive. All primitive recursive functions are total and computable, but the Ackermann function illustrates that not all total computable functions are primitive recursive. After Ackermann's publication of his function, many authors modified it to suit various purposes, so that today "the Ackermann function" may refer to any of numerous variants of the original function. One common version, the two-argument Ackermann–Péter function, is defined as follows for nonnegative integers m and n:
Wilhelm Friedrich Ackermann was a German mathematician best known for the Ackermann function, an important example in the theory of computation.
Ackermann steering geometry is a geometric arrangement of linkages in the steering of a car or other vehicle designed to solve the problem of wheels on the inside and outside of a turn needing to trace out circles of different radii.
Rudolph Ackermann was an Anglo-German bookseller, inventor, lithographer, publisher and businessman.
Rosemarie "Rosi" Ackermann, born 4 April 1952 in Lohsa, Sachsen, is a former East German high jumper. On 26 August 1977 in Berlin, she became the first female high jumper to clear a height of 2 metres.
Winterfresh is a wintergreen flavored variety of chewing gum made by the Wm. Wrigley Jr. Company. Introduced in the United States in 1994 as an alternative to their Big Red brand, it has had two packaging designs as of 2004. Extra gum, a sugarless gum, introduced a Winterfresh flavor in 1988, while Freedent introduced a Winterfresh flavor around the same time the Winterfresh brand gum was introduced.
Anton Ackermann was an East German politician. In 1953, he briefly served as Minister of Foreign Affairs.
Josef Meinrad Ackermann is a Swiss banker, former Chairman of the Bank of Cyprus, and former chief executive officer of Deutsche Bank. He has also been a member of the influential Washington-based financial advisory body, the Group of Thirty.
LourensWepener Hugo "Laurie" Ackermann is a former justice of the Constitutional Court of South Africa, where he served from 1994 to 2004.
Ronny Ackermann is a successful German Nordic combined skier.
Berluti is a subsidiary brand of LVMH that manufactures menswear, especially the leather finishing of calfskin, kangaroo leather and alligator skin in its production of shoes and boots. It makes leather belts, bags, and wallets, as well as bespoke and ready-to-wear garments. Established in 1895 by Italian Alessandro Berluti of Marche, Berluti is based in Paris on rue Marbeuf. Its current creative director is Kris Van Assche.
Johannes Nicolaas 'Johan' Ackermann is a South African rugby union coach and former player. He played as a lock during his playing career between 1995 and 2007. He is currently head coach at Red Hurricanes.
Sam Bennett is an Irish professional cyclist, who rides for UCI WorldTeam Deceuninck–Quick-Step. A road sprinter, he turned professional in 2011, and has won eight Grand Tour stages: three stages for Bora–Hansgrohe in the 2018 Giro d'Italia, two stages for Bora–Hansgrohe at the 2019 Vuelta a España, two stages for Deceuninck–Quick-Step at the 2020 Tour de France, where he also won the Points classification, and one stage for Deceuninck–Quick-Step at the 2020 Vuelta a España.
The Koolakamba or Kooloo-Kamba is a purported hybrid species of chimpanzees and gorillas. This alleged hybrid ape species has been reported in Africa as early as the mid 19th century. No empirical evidence has been found to substantiate the existence of the creature. The Koolakamba was referenced in the mid-19th century in French work by Franquet and in some descriptive work of Paul Du Chaillu from 1860, 1861, 1867, and 1899, some of which was republished in 1969.
Queen of Trumps (1832–1843) was a British thoroughbred racehorse and broodmare best known for winning the classic Oaks and St Leger Stakes in 1835, becoming the first horse to win both races. In a racing career which lasted from October 1834 until October 1836 she won ten of her eleven races. After being successful in her only race as a two-year-old, she defeated the 1000 Guineas winner Preserve in the Oaks on her three-year-old debut. Later that year she started favourite for the St Leger and won from a field which included Preserve and The Derby winner Mundig. Queen of Trumps sustained her only defeat a few days later when she was attacked by a dog in the closing stages of the Scarborough Stakes. She was retired to stud after winning all four of her races in 1836. Queen of Trumps died in 1843 at the age of eleven. She was described by a contemporary writer as "certainly the most extraordinary mare these our days have seen".
Colin Niel Ackermann is a South African cricketer who plays for Leicestershire County Cricket Club in England and the Netherlands national cricket team. He made his international debut for the Netherlands in October 2019.
Ruan Ackermann is a South African rugby union player, currently playing in the English Premiership with Gloucester. His regular position is flanker.
Else Ackermann was a German physician and pharmacologist who became an East German politician. The report on the power relationships between the citizen and the state which she drafted, and in 1988 presented, known as the "Neuenhagen Letter", was a significant precursor to the changes of 1989 which led to the ending, in the early summer of 1990, of the one-party dictatorship, followed by German reunification later that same year.
The 2019 Giro d'Italia was a three-week Grand Tour cycling stage race organised by RCS Sport that took place mainly in Italy, between 11 May and 2 June 2019. The race was the 102nd edition of the Giro d'Italia and was the first Grand Tour of the 2019 cycling season. The race started with an individual time trial in Bologna, and finished with another time-trial in Verona. The race was won by Richard Carapaz, who became the first Ecuadorian rider to win the Giro d'Italia. Italian Vincenzo Nibali (Bahrain–McLaren) finished 2nd, with Slovenian rider Primož Roglič in 3rd place. Carapaz also became the second South American rider to win the Giro, after Nairo Quintana in 2014.
Annemarie Ackermann was a German politician of the Christian Democratic Union (CDU) and former member of the German Bundestag.
References
- ↑ "Sean Ackermann". ESPN Cricinfo. Retrieved 1 December 2020.
