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Seki Kōwa
, Selin, Helaine. (1997). ''Encyclopaedia of the History of Science, Technology, and Medicine in Non-Western Cultures,'' p. 890 also known as ,Selin, was a mathematician, samurai, and Kofu feudal officer of the early Edo period of Japan. Seki laid foundations for the subsequent development of Japanese mathematics, known as ''wasan'' from c. 1870. He has been described as "Japan's Newton". He created a new algebraic notation system and, motivated by astronomical computations, did work on infinitesimal calculus and Diophantine equations. Although he was a contemporary of German polymath mathematician and philosopher Gottfried Leibniz and British polymath physicist and mathematician Isaac Newton, Seki's work was independent. His successors later developed a school dominant in Japanese mathematics until the end of the Edo period. While it is not clear how much of the achievements of ''wasan'' are Seki's, since many of them appear only in writings of his pupils, some of the res ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Japan Academy
The Japan Academy ( Japanese: 日本学士院, ''Nihon Gakushiin'') is an honorary organisation and science academy founded in 1879 to bring together leading Japanese scholars with distinguished records of scientific achievements. The Academy is currently an extraordinary organ of the Ministry of Education, Culture, Sports, Science and Technology with its headquarters located in Taito, Tokyo, Japan. Election to the Academy is considered the highest distinction a scholar can achieve, and members enjoy life tenure and an annual monetary stipend. History In 1873, Meiroku-sha (Meiroku Society) was founded. The main people of Meiroku-sha involved in Meiroku-sha were from Kaiseijo (later transformed into University of Tokyo) and Keio Gijuku. In an effort to replicate the institutional landscape found in many Western nations, the leaders of the Meiji government sought to create a national academy of scholars and scientists modelled to the British Royal Society. In 1879, Nishi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Determinant
In mathematics, the determinant is a Scalar (mathematics), scalar-valued function (mathematics), function of the entries of a square matrix. The determinant of a matrix is commonly denoted , , or . Its value characterizes some properties of the matrix and the linear map represented, on a given basis (linear algebra), basis, by the matrix. In particular, the determinant is nonzero if and only if the matrix is invertible matrix, invertible and the corresponding linear map is an linear isomorphism, isomorphism. However, if the determinant is zero, the matrix is referred to as singular, meaning it does not have an inverse. The determinant is completely determined by the two following properties: the determinant of a product of matrices is the product of their determinants, and the determinant of a triangular matrix is the product of its diagonal entries. The determinant of a matrix is :\begin a & b\\c & d \end=ad-bc, and the determinant of a matrix is : \begin a & b & c \\ d & e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tokugawa Ieyasu
Tokugawa Ieyasu (born Matsudaira Takechiyo; 31 January 1543 – 1 June 1616) was the founder and first ''shōgun'' of the Tokugawa shogunate of Japan, which ruled from 1603 until the Meiji Restoration in 1868. He was the third of the three "Great Unifiers" of Japan, along with his former lord Oda Nobunaga, Oda Nobunaga and fellow Oda clan, Oda subordinate Toyotomi Hideyoshi. The son of a minor daimyo, Ieyasu once lived as a hostage under daimyo Imagawa Yoshimoto on behalf of his father. He later succeeded as daimyo after his father's death, serving as ally, vassal, and general of the Oda clan, and building up his strength under Oda Nobunaga. After Oda Nobunaga's death, Ieyasu was briefly a rival of Toyotomi Hideyoshi, before declaring his allegiance to Toyotomi and fighting on his behalf. Under Toyotomi, Ieyasu was relocated to the Kantō region, Kanto plains in eastern Japan, away from the Toyotomi power base in Osaka. He built Edo Castle, his castle in the fishing village of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edo Castle
is a flatland castle that was built in 1457 by Ōta Dōkan in Edo, Toshima District, Musashi Province. In modern times it is part of the Tokyo Imperial Palace in Chiyoda, Tokyo, and is therefore also known as . Tokugawa Ieyasu established the Tokugawa shogunate there, and it was the residence of the ''shōgun'' and the headquarters of the military government during the Edo period (1603–1867) in Japanese history. After the resignation of the ''shōgun'' and the Meiji Restoration, it became the Tokyo Imperial Palace. Some moats, walls and ramparts of the castle survive to this day. However, the grounds were more extensive during the Edo period, with Tokyo Station and the Marunouchi section of the city lying within the outermost moat. It also encompassed Kitanomaru Park, the Nippon Budokan Hall and other current landmarks of the surrounding area. History The warrior Edo Shigetsugu built his residence in what is now the ''Honmaru'' and ''Ninomaru'' part of Edo Castle, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kan'ei
was a after '' Genna'' and before ''Shōhō.'' This period spanned the years from February 1624 through December 1644. The reigning emperors and single empress were , and .Titsingh, Isaac. (1834) ''Annales des empereurs du japon'', p. 411./ref> Change of era * 1624 : The era name was changed to mark the start of a new cycle of the Chinese zodiac. The previous era ended and a new one commenced in ''Genna'' 9, on the 30th day of the 2nd month. This era name is derived from 寛広、永長 (meaning "Broad Leniency, Eternal Leader"). Events * 1624 (''Kan'ei 1''): Construction of the Hōei-zan temple began. * November 4, 1626 (''Kan'ei 3, 16th day of the 9th month''): Emperor Go-Mizunoo and the empress visited Nijō Castle; they were accompanied by Princes of the Blood, palace ladies and ''kuge''. Among the precedents for this was the Tenshō era visit of Emperor Go-Yōzei to Toyotomi Hideyoshi's extravagant Heian-kyō mansion, Juraku-dai (which Hideyoshi himself would te ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tokugawa Tadanaga
was a Japanese ''daimyō'' of the early Edo period. The son of the second ''shōgun'' Tokugawa Hidetada, his elder brother was the third ''shōgun'' Tokugawa Iemitsu. Biography Often called ''Suruga Dainagon'' (the major counsellor of Suruga), Tadanaga was born in 1606. His birth name was ''Kunichiyo'' (国千代). The date of his birth is uncertain, and is variously given as May 7, June 1, and December 3. Blessed with military and intellectual prowess and a generosity of spirit, he received support from his mother, Oeyo (or Sūgen'in), who favored him over her other son Takechiyo (the future Iemitsu) to become the third shogun. Just after the death of their father shogun Hidetada, Iemitsu accused his brother, already under house arrest in Kōfu, of insanity, stripped him of all possessions and offices, leaving him to commit seppuku.Beatrice M. Bodart-Bailey, "The Dog Shogun" p. 14 It is also said that Tadanaga's face was similar to that of his cousin Toyotomi Hideyori ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gunma Prefecture
is a landlocked Prefectures of Japan, prefecture of Japan located in the Kantō region of Honshu. Gunma Prefecture has a population of 1,937,626 (1 October 2019) and has a geographic area of . Gunma Prefecture borders Niigata Prefecture and Fukushima Prefecture to the north, Nagano Prefecture to the southwest, Saitama Prefecture to the south, and Tochigi Prefecture to the east. Maebashi is the capital and Takasaki is the largest city of Gunma Prefecture, with other major cities including Ōta, Gunma, Ōta, Isesaki, Gunma, Isesaki, and Kiryū, Gunma, Kiryū. Gunma Prefecture is one of only eight landlocked prefectures, located on the northwestern corner of the Kantō Plain with 14% of its total land being designated as List of national parks of Japan, natural parks. History The ancient province of Gunma was a center of horse breeding and trading activities for the newly immigrated continental peoples (or Toraijin). The arrival of horses and the remains of horse tackle coinci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
