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Knuth Reward Check
Knuth reward checks are checks or check-like certificates awarded by computer scientist Donald Knuth for finding technical, typographical, or historical errors, or making substantial suggestions for his publications. The ''MIT Technology Review'' describes the checks as "among computerdom's most prized trophies". History Initially, Knuth sent real, negotiable checks to recipients. He stopped doing so in October 2008 because of problems with check fraud. As a replacement, he started his own "Bank of San Serriffe", in the fictional nation of San Serriffe, which keeps an account for everyone who found an error since 2006. Knuth now sends out "hexadecimal certificates" instead of negotiable checks. , Knuth reported having written more than 2,000 checks, with an average value exceeding $8 per check.Donald Knuth (2002),All questions answered", ''Notices of the AMS'' 49(3): 318-324. , the total value of the checks signed by Knuth was over $20,000. Very few of these checks were actually ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wheat And Chessboard Problem
The wheat and chessboard problem (sometimes expressed in terms of rice grains) is a mathematical problem expressed in textual form as: The problem may be solved using simple addition. With 64 squares on a chessboard, if the number of grains doubles on successive squares, then the sum of grains on all 64 squares is: and so forth for the 64 squares. The total number of grains can be shown to be 264−1 or 18,446,744,073,709,551,615 (eighteen quintillion, four hundred forty-six quadrillion, seven hundred forty-four trillion, seventy-three billion, seven hundred nine million, five hundred fifty-one thousand, six hundred and fifteen, over 1.4 trillion metric tons), which is over 2,000 times the annual world production of wheat. This exercise can be used to demonstrate how quickly exponential sequences grow, as well as to introduce exponents, zero power, capital-sigma notation and geometric series. Updated for modern times using pennies and a hypothetical question such as "W ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Challenge Awards
Challenge may refer to: * Voter challenging or caging, a method of challenging the registration status of voters * Euphemism for disability * Peremptory challenge, a dismissal of potential jurors from jury duty Places Geography *Challenge, California, an unincorporated community * Challenge-Brownsville, California, a census-designated place in Yuba County, California, United States Structures *Challenge Stadium, former name of Perth Superdrome, a sports complex in Perth, Australia Books and publications * ''Challenge'' (anarchist periodical), American anarchist weekly tabloid, 1938–1939 * ''Challenge'' (Communist journal), British Young Communist League magazine, and also the name of the newspaper of the communist Progressive Labor Party (USA) * ''Challenge'' (game magazine), a role-playing game magazine * ''Challenge'' (economics magazine), a magazine covering economic affairs * ''Challenge'' (Bulldog Drummond), a Bulldog Drummond novel by H. C. McNeile * ''Challeng ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Public Radio
National Public Radio (NPR, stylized in all lowercase) is an American privately and state funded nonprofit media organization headquartered in Washington, D.C., with its NPR West headquarters in Culver City, California. It differs from other non-profit membership media organizations such as the Associated Press, in that it was established by an act of Congress. Most of its member stations are owned by non-profit organizations, including public school districts, colleges, and universities. It serves as a national Radio syndication, syndicator to a network of over 1,000 public radio List of NPR stations, stations in the United States. , NPR employed 840 people. NPR produces and distributes news and cultural programming. The organization's flagship shows are two drive time, drive-time news broadcasts: ''Morning Edition'' and the afternoon ''All Things Considered'', both carried by most NPR member stations, and among the List of most-listened-to radio programs, most popular radio p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RealVideo
RealVideo, or also spelled as Real Video, is a suite of proprietary video compression formats developed by RealNetworks – the specific format changes with the version. It was first released in 1997 and was at version 10. RealVideo is supported on many platforms, including Windows, Mac, Linux, Solaris, and several mobile phones. RealVideo is usually paired with RealAudio and packaged in a RealMedia (.rm) container. RealMedia is suitable for use as a streaming media format, that is one which is viewed while it is being sent over the network. Streaming video can be used to watch live television, since it does not require downloading the entire video in advance. Technology The first version of RealVideo was announced in 1997 and was based on the H.263 format. At the time, RealNetworks issued a press release saying they had licensed Iterated Systems' ClearVideo technology and were including it as the RealVideo Fractal Codec. However, support for ClearVideo quietly disappeared in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paul Erdős
Paul Erdős ( hu, Erdős Pál ; 26 March 1913 – 20 September 1996) was a Hungarian mathematician. He was one of the most prolific mathematicians and producers of mathematical conjectures of the 20th century. pursued and proposed problems in discrete mathematics, graph theory, number theory, mathematical analysis, approximation theory, set theory, and probability theory. Much of his work centered around discrete mathematics, cracking many previously unsolved problems in the field. He championed and contributed to Ramsey theory, which studies the conditions in which order necessarily appears. Overall, his work leaned towards solving previously open problems, rather than developing or exploring new areas of mathematics. Erdős published around 1,500 mathematical papers during his lifetime, a figure that remains unsurpassed. He firmly believed mathematics to be a social activity, living an itinerant lifestyle with the sole purpose of writing mathematical papers with other mathem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Computer-related Awards
This list of computer-related awards is an index to articles about notable awards given for computer-related work. It excludes computer science awards and competitions, video game awards and web awards, which are covered by separate lists. Hardware Open source / freeware / shareware Security Programming Applications Scholarship Other See also * Lists of awards * List of computer science awards * Lists of science and technology awards This is a list of notable awards for specific areas of science and technology. Typically these lists give the country of the sponsoring organization, the award name, sponsor name and a description of the award criteria. Some of the awards have bro ... * List of engineering awards References {{Science and technology awards Computer-related ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Concrete Mathematics
''Concrete Mathematics: A Foundation for Computer Science'', by Ronald Graham, Donald Knuth, and Oren Patashnik, first published in 1989, is a textbook that is widely used in computer-science departments as a substantive but light-hearted treatment of the analysis of algorithms. Contents and history The book provides mathematical knowledge and skills for computer science, especially for the analysis of algorithms. According to the preface, the topics in ''Concrete Mathematics'' are "a blend of CONtinuous and disCRETE mathematics". Calculus is frequently used in the explanations and exercises. The term "concrete mathematics" also denotes a complement to " abstract mathematics". The book is based on a course begun in 1970 by Knuth at Stanford University. The book expands on the material (approximately 100 pages) in the "Mathematical Preliminaries" section of Knuth's ''The Art of Computer Programming''. Consequently, some readers use it as an introduction to that series of book ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theta
Theta (, ; uppercase: Θ or ; lowercase: θ or ; grc, ''thē̂ta'' ; Modern: ''thī́ta'' ) is the eighth letter of the Greek alphabet, derived from the Phoenician letter Teth . In the system of Greek numerals, it has a value of 9. Greek In Ancient Greek, θ represented the aspirated voiceless dental plosive , but in Modern Greek it represents the voiceless dental fricative . Forms In its archaic form, θ was written as a cross within a circle (as in the Etruscan or ), and later, as a line or point in circle ( or ). The cursive form was retained by Unicode as , separate from . (There is also ). For the purpose of writing Greek text, the two can be font variants of a single character, but are also used as distinct symbols in technical and mathematical contexts. Extensive lists of examples follow below at Mathematics and Science. is also common in biblical and theological usage e.g. instead of πρόθεσις (means placing in public or laying out a corpse). ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
