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HandWiki is the world's largest wiki-style encyclopedia dedicated to science, technology and computing. It allows you to create and edit articles as long as you have external citations and login account. In addition, this is a content management environment that can be used for collaborative editing of original scholarly content, such as books, manuals, monographs and tutorials.

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List of Matrices
This page lists some important classes of matrices used in mathematics, science and engineering. A matrix (plural matrices, or less commonly matrixes) is a rectangular array of numbers called entries. Matrices have a long history of both study and application, leading to diverse ways of classifying matrices. A first group is matrices satisfying concrete conditions of the entries, including constant matrices. An important example is the identity matrix given by Further ways of classifying matrices are according to their eigenvalues or by imposing conditions on the product of the matrix with other matrices. Finally, many domains, both in mathematics and other sciences including physics and chemistry have particular matrices that are applied chiefly in these areas.
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Topic Review
Cancellation of Debt (COD) Income
Taxpayers in the United States may have tax consequences when debt is cancelled. This is commonly known as COD (Cancellation of Debt) Income. According to the Internal Revenue Code, the discharge of indebtedness must be included in a taxpayer's gross income. There are exceptions to this rule, however, so a careful examination of one's COD income is important to determine any potential tax consequences. Billions of dollars of cancelled debts will generate many unexpected tax bills, due to debt cancellations that financial institutions have started accelerating in 2012.
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Topic Review
Hoya
Hoya is a genus of 200–300 species of tropical plants in the dogbane family, Apocynaceae. Most are native to several countries of Asia such as China , India , Thailand, Malaysia, Vietnam, Bangladesh, and Indonesia. There is a great diversity of species in the Philippines , and species in Polynesia, New Guinea, and Australia . Common names for this genus are waxplant, waxvine, waxflower or simply hoya. This genus was named by botanist Robert Brown, in honour of his friend, botanist Thomas Hoy.
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Biography
Róbert Bárány
Robert Bárány (Hungarian: Bárány Róbert; Hungarian pronunciation: [ˈroːbɛrt ˈbaːraːɲ]; 22 April 1876 – 8 April 1936) was an ethnic Hungarian otologist from Austria.[1] He received the 1914 Nobel Prize in Physiology or Medicine for his work on the physiology and pathology of the vestibular apparatus.[2] Bárány was born in Vienna, Austria-Hungary. He was the eldest of six child
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Biography
Charles Stevenson
Charles Leslie Stevenson (1908–1979) was an American analytic philosopher best known for his work in ethics[1] and aesthetics.[2] Stevenson was born on June 27, 1908, in Cincinnati, Ohio. He was educated at Yale, receiving in 1930 a Bachelor of Arts (BA) degree in English literature, at Cambridge where in 1933 he was awarded a BA degree in moral sciences (philosophy), and at Harvard, gettin
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Topic Review
List of Unnumbered Minor Planets: 2001 S–Y
This is a partial list of unnumbered minor planets for principal designations assigned between 16 September 2001 and 31 December 2001 (S–Z).
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Topic Review
Ashtavinayaka
Ashtavinayak (Marathi: अष्टविनायक) literally means "eight Ganeshas" in Sanskrit. Ganesh is the Hinduism/Hindu deity of unity, prosperity & learning and removes obstacles. The term refers to eight Ganeshas. Ashtavinayaka yatra trip refers to a pilgrimage to the eight Hindu temples in Maharashtra state of India that house eight distinct idols of Ganesh, in a pre-ascertained sequence. The Ashtavinayak yatra or pilgrimage covers the eight ancient holy temples of Ganesh which are situated around Pune. Each of these temples has its own individual legend and history, as distinct from each other as the murtis in each temple. The form of each murti of Ganesh and His trunk are distinct from one another. However, there are other temples of eight Ganesh in various other parts of Maharashtra; the ones around Pune are more well known than the former. It is believed to be for completion of Ashtavinayak Yatra visit the first Ganpati after visiting all the eight Ganpatis again, to complete the yatra.
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Biography
Victoria, Lady Welby
Victoria, Lady Welby (27 April 1837 – 29 March 1912), more correctly Lady Welby-Gregory,[1] was a self-educated English philosopher of language, musician and watercolour artist. Welby was born to the Hon. Charles Stuart-Wortley-Mackenzie and Lady Emmeline Stuart-Wortley, and christened Victoria Alexandrina Maria Louisa Stuart-Wortley. Following the death of her father in 1844, she travelled
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Topic Review
Redoutable-Class Submarine (1931)
The Redoutable-class submarines were a group of 31 submarines built between 1924 and 1937 for the French Navy. Most of the class saw service during the Second World War. The class is also known in French as the Classe 1 500 tonnes, and they were designated as "First Class submarines", or "large submarine cruisers". They are known as the Redoutable class in reference to the lead boat Redoutable, in service from 1931 to 1942. The class is divided into two sub-class series, Type I, known as Le Redoutable and Type II, Pascal. Modern submarines when they were designed, they quickly became outdated, and were approaching obsolescence by the beginning of the Second World War. The conditions of the Armistice of 22 June 1940 prevented the Vichy government from carrying out a modernization programme. 24 out of the 29 units that served in the war were lost. Used in the defence of the Second French colonial empire under the Vichy regime, submarines of the class saw action against Allied offensives at the Battles of Dakar, Libreville and Madagascar. Many of the submarines of the class came under Allied control after the Allied landings in North Africa. Few however saw much further active service after this due to a period of refitting and alterations done in the United States between February 1943 and March 1945. One exception was Casabianca, which took part in the liberation of Corsica. The surviving submarines were largely used for training purposes after the war, with the last of them being disarmed in 1952.
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Biography
Edmund Husserl
Edmund Gustav Albrecht Husserl (/ˈhʊsɜːrl/ HUUSS-url,[1][2] also US: /ˈhuːsɜːrl, ˈhʊsərəl/ HOO-surl, HUUSS-ər-əl;[3][4] German: [ˈʔɛtmʊnt ˈhʊsɐl];[5] 8 April 1859 – 27 April 1938)[6] was a German[7][8] philosopher who established the school of phenomenology. In his early work, he elaborated critiques of historicism and of psychologism in logic based on analyses of intentio
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