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An independence problem (or unguard [2]) is a problem in which, given a certain type of chess piece (queen, rook, bishop, knight or king), one must find the maximum number that can be placed on a chessboard so that none of the pieces attack each other. It is also required that an actual arrangement for this maximum number of pieces be found.
There are 92 solutions. The problem was first posed in the mid-19th century. In the modern era, it is often used as an example problem for various computer programming techniques. The eight queens puzzle is a special case of the more general n queens problem of placing n non-attacking queens on an n×n chessboard.
Many mathematical problems have been stated but not yet solved. These problems come from many areas of mathematics, such as theoretical physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph theory, group theory, model theory, number theory, set theory, Ramsey theory, dynamical systems, and partial differential equations.
Giant or Waiting for the Thursday Boat is a children's book by Canadian author Robert Munsch and illustrated by Gilles Tibo, first published in 1989 by Annick Press.Due to depictions of the Judeo-Christian-Islamic God as a little African American girl, as well as threats of violence against God by the titular Giant, it was challenged or removed from school libraries in Canada.
1.e4 e5 2.Qh5 has acquired several names over the years, none of which are universally used. The earliest known appearance in print was in the Dubuque Chess Journal in May 1875, where it was dubbed the Kentucky Opening, [2] perhaps in reference to a game played in Danville, Kentucky, which was published in the August issue of the same magazine. [8]
In May 2011, a remastered and expanded reissue of the album was released. This was part of a new record deal between Queen and Universal Music, which meant Queen's association with EMI Records would come to an end after almost 40 years. According to Universal Music, all Queen albums would be remastered and reissued in 2011.
The problem is so well known that the entire class is often referred to broadly as "monkey and coconut type problems", though most are not closely related to the problem. Another example: "I have a whole number of pounds of cement, I know not how many, but after addition of a ninth and an eleventh, it was partitioned into 3 sacks, each with a ...
Dehn's proof is an instance in which abstract algebra is used to prove an impossibility result in geometry.Other examples are doubling the cube and trisecting the angle.. Two polyhedra are called scissors-congruent if the first can be cut into finitely many polyhedral pieces that can be reassembled to yield the second.