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Contra Costa County Library Established 1913 ; 106 years ago  ( 1913 ) [1] Location Contra Costa County, California Branches 26 Access and use Circulation 7,422,673 [1] Population served 1,024,319 [2] Members 455,607 [1] Other information Director Melinda S. Cervantes, County Librarian [3] Website ccclib.org The Contra Costa County Library is the public library system in Contra Costa County, California, United States. There are 26 community libraries including the NRHP-listed Martinez Library, [4] access to electronic information via a website, over 455,000 cardholders and more than 7 million items borrowed annually. Its headquarters are in Martinez. [5] Contents 1 History 2 Service 3 Other programs 4 References 5 External links History Founded in 1913, the Contra Costa County Library brought a commitment to widespread, county-wide service. Prior to this time, libraries for the public included the Martin...

London Mathematical Society Formation 1865 Type Learned society Headquarters London, WC1 United Kingdom President Caroline Series Key people Catherine Hobbs (Vice President) Website www.lms.ac.uk The London Mathematical Society ( LMS ) is one of the United Kingdom's learned societies for mathematics (the others being the Royal Statistical Society (RSS) and the Institute of Mathematics and its Applications (IMA)). Contents 1 History 1.1 Proposal for unification with the IMA 2 Activities 3 Publications 4 Prizes 5 List of presidents 6 See also 7 References 8 External links History De Morgan House The Society was established on 16 January 1865, the first president being Augustus De Morgan. The earliest meetings were held in University College, but the Society soon moved into Burlington House, Piccadilly. The initial activities of the Society included talks and publication of a journal. The...

body.skin-minerva .mw-parser-output table.infobox caption{text-align:center} 乌介可汗 性别 男 出生 ? 回鹘草原 逝世 846年 回鹘草原 别名 烏希特勒 职业 政治人物 活跃时期 9世紀 亲属 兄 昭禮可汗 经历 王族 可汗 乌介可汗 （？－846年），𨁂跌氏，原为 乌希特勒 ，是回鹘的第十四任可汗。 840年，㕎馺特勒被所属部黠戛斯击败，可汗和掘罗勿被杀，回鹘汗国崩溃四散。留在漠北的部落立昭禮可汗的弟弟乌希特勒为乌介可汗。乌介可汗率部南迁至唐朝的天德军（今内蒙古五原）、振武军（今内蒙古托克托）北，常常掠夺唐朝边境。843年，唐武宗和宰相李德裕派天德军使石雄击败回鹘，迎回太和公主，乌介可汗北逃。846年，為宰相逸隐啜所殺。 前任： 㕎馺特勒 回鹘可汗 841年－846年 繼任： 遏捻可汗 参考資料 《旧唐書》回纥传 《新唐書》回鹘传 This page is only for reference, If you need detailed information, please check here

The Senior Whitehead Prize of the London Mathematical Society (LMS) is now awarded in odd numbered years in memory of John Henry Constantine Whitehead, president of the LMS between 1953 and 1955. The Prize is awarded to mathematicians normally resident in the United Kingdom on 1 January of the relevant year. Selection criteria include work in, influence on or service to mathematics, or recognition of lecturing gifts in the field of mathematics. Previous recipients of top LMS prizes or medals are ineligible for nomination. Contents 1 History 2 Prize winners [2] 3 External links 4 See also 5 References History The London Mathematical Society dates back to 1864. Augustus De Morgan's wife, writing after his death described how the London Mathematical Society was founded:- It was in the year 1864 that Mr Arthur Cowper Ranyard and George [George De Morgan, De_Morgan>Augustus De Morgan's son] were discussing mathematical problems during a walk...

In mathematics, the Gauss class number problem ( for imaginary quadratic fields ), as usually understood, is to provide for each n  ≥ 1 a complete list of imaginary quadratic fields Q(d){displaystyle mathbb {Q} ({sqrt {d}})} (for negative integers d ) having class number n . It is named after Carl Friedrich Gauss. It can also be stated in terms of discriminants. There are related questions for real quadratic fields and for the behavior as d→ − ∞ {displaystyle dto -infty } . The difficulty is in effective computation of bounds: for a given discriminant, it is easy to compute the class number, and there are several ineffective lower bounds on class number (meaning that they involve a constant that is not computed), but effective bounds (and explicit proofs of completeness of lists) are harder. Contents 1 Gauss's original conjectures 2 Status 3 Lists of discriminants of class number 1 4 Modern developments 5 Real quadratic fields 6 See also 7 N...

Algebraic K -theory is a subject area in mathematics with connections to geometry, topology, ring theory, and number theory. Geometric, algebraic, and arithmetic objects are assigned objects called K -groups. These are groups in the sense of abstract algebra. They contain detailed information about the original object but are notoriously difficult to compute; for example, an important outstanding problem is to compute the K -groups of the integers. K -theory was invented in the late 1950s by Alexander Grothendieck in his study of intersection theory on algebraic varieties. In the modern language, Grothendieck defined only K 0 , the zeroth K -group, but even this single group has plenty of applications, such as the Grothendieck–Riemann–Roch theorem. Intersection theory is still a motivating force in the development of (higher) algebraic K -theory through its links with motivic cohomology and specifically Chow groups. The subject also includes classical number-theoretic topics ...