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Divided into two parts-Theory of the Icosahedron and The Theory of Equations of the Fifth Degree-The Icosahedron covers: . the regular solids and the theory of groups . introduction of (x + iy) . statement and discussion of the fundamental problem, according to the theory of functions . the algebraical character of the fundamental problem . general theorems and survey of the subject . the historical development of the theory of equations of the fifth degree . introduction of geometrical material . the canonical equations of the fifth degree . the problem of the A's and the Jacobian equations of the sixth degree . the general equation of the fifth degree Complete with detailed equations and instructive material, The Icosahedron will be valued by experts in higher mathematics and students of algebra alike. German mathematician FELIX KLEIN (1849-1925) specialized in function theory, group theory, and non-Euclidean geometry. His published works include Elementary Mathematics from an Advanced Standpoint: Arithmetic, Algebra, Analysis; Elementary Mathematics from an Advanced Standpoint: Geometry; and Famous Problems of Elementary Geometry.","brand":"WoB","offers":[{"title":"GB \/ VERY_GOOD \/ INTERNAL","offer_id":49585902518545,"sku":"GOR012058954","price":0.0,"currency_code":"GBP","in_stock":false},{"title":"US \/ NEW \/ INGRAM","offer_id":51038837211409,"sku":"NIN9781602063068","price":0.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/4072\/6801\/files\/1602063060.jpg?v=1750763436"},{"product_id":"ueber-die-transformation-der-allgemeinen-gleichung-des-zweiten-grades-zwischen-l-book-felix-klein-9783752510010","title":"UEber die Transformation der allgemeinen Gleichung des zweiten Grades zwischen Linien-Coordinaten","description":null,"brand":"WoB","offers":[{"title":"GB \/ VERY_GOOD \/ INTERNAL","offer_id":49591322870033,"sku":"GOR013490149","price":0.0,"currency_code":"GBP","in_stock":false},{"title":"GB \/ NEW \/ INGRAM","offer_id":52684401213713,"sku":"NLS9783752510010","price":0.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/4072\/6801\/files\/3752510013.jpg?v=1751350180"},{"product_id":"elementary-mathematics-from-an-advanced-standpoint-book-felix-klein-9780486434803","title":"Elementary Mathematics from an Advanced Standpoint","description":"These three volumes constitute the first complete English translation of Felix Klein's seminal series Elementarmathematik vom hü¾¦˜¼heren Standpunkte aus. Complete has a twofold meaning here: First, there now exists a translation of volume I into English, while until today the only translation had been into Chinese. Second, the English versions of volume I and I had omitted several, even extended parts of the original, while we now present a complete revised translation into modern English.\u003cbr\u003eThe volumes, first published between 1902 and 1908, are lecture notes of courses that Klein offered to future mathematics teachers, realizing a new form of teacher training that remained valid and effective until today: Klein leads the students to gain a more comprehensive and methodological point of view on school mathematics. The volumes enable us to understand Klein's far-reaching conception of elementarisation, of the elementary from a higher standpoint, in its implementation for school mathematics.\u003cbr\u003eThis volume I presents a paradigmatic realisation of Klein's approach of elementarisation for teacher education. It is shown how the various geometries, elaborated particularly since the beginning of the 19th century, are revealed as becoming unified in a new restructured geometry. As Klein put it: Projective geometry is all geometry. Non-Euclidean geometry proves to constitute a part of this unifying process. The teaching of geometry is discussed in a separate chapter, which provides moreover important information on the history of geometry teaching and an international comparison.\u003cbr\u003e\u003cb\u003eAbout the Author\u003c\/b\u003eFelix Klein (1849-1925) was a leading German mathematician whose research interests included group theory, complex analysis, and geometry. His work influenced many areas of mathematics and related subjects, ranging from mathematical physics to mathematical didactics. 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His many talents included an ability to express complicated mathematical ideas directly and comprehensively, and this book, a consideration of the investigations in the first part of Riemann's \u003ci\u003eTheory of Abelian Functions\u003c\/i\u003e, is a prime example of his expository powers.\u003cbr\u003eThe treatment introduces Riemann's approach to multiple-value functions and the geometrical representation of these functions by what later became known as Riemann surfaces. It further concentrates on the kinds of functions that can be defined on these surfaces, confining the treatment to rational functions and their integrals. The text then demonstrates how Riemann's mathematical ideas about Abelian integrals can be arrived at by thinking in terms of the flow of electric current on surfaces. Klein's primary concern is preserving the sequence of thought and offering intuitive explanations of Riemann's notions, rather than furnishing detailed proofs. Deeply significant in the area of complex functions, this work constitutes one of the best introductions to the origins of topological problems.","brand":"WoB","offers":[{"title":"GB \/ NEW \/ GARDNERS","offer_id":49731891167505,"sku":"NGR9780486828336","price":0.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/4072\/6801\/files\/0486828336.jpg?v=1750879204"},{"product_id":"gestalt-graphology-book-felix-klein-9780595443079","title":"Gestalt Graphology","description":"Founder of the National Society for Graphology, Felix Klein began his study of graphology in his birthplace, Vienna, Austria, at the age of thirteen. He was a practicing graphologist all of his life and lectured and gave seminars throughout the United States and in Canada, England, Germany, Israel and Mexico.  \u003cp\u003eMr. Klein came to the United States in 1940 after spending six months each in the concentration camps at Dachau and Buchenwald. While in those camps he formulated his theory of directional pressure as a result of studying changes in the handwriting of his fellow inmates. \u003c\/p\u003e \u003cp\u003eMr. Klein did extensive work in personnel selection for major companies and banks, vocational guidance, and individual analyses, as well as forensic document examination for such entities as the U.N., AT\u0026amp;T, and a major political figure in Ghana, Africa. \u003c\/p\u003e \u003cp\u003eIt was probably as a teacher that Felix was most known and loved. He held classes and offered correspondence courses in all levels of graphology: elementary, intermediate, advanced, Master Research, and Psychology for Graphologists. \u003c\/p\u003e \u003cp\u003eWherever Felix spoke, his warm, caring personality and his naturalness and keen sense of humor generated enthusiastic responses from young and old alike. \u003c\/p\u003e","brand":"WoB","offers":[{"title":"GB \/ VERY_GOOD \/ INTERNAL","offer_id":49985098187025,"sku":"GOR006403476","price":0.0,"currency_code":"GBP","in_stock":false},{"title":"US \/ NEW \/ INGRAM","offer_id":51004675424529,"sku":"NIN9780595443079","price":0.0,"currency_code":"GBP","in_stock":true},{"title":"GB \/ NEW \/ INGRAM","offer_id":52407334011153,"sku":"NLS9780595443079","price":0.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/4072\/6801\/files\/0595443079.jpg?v=1751230188"},{"product_id":"elementary-mathematics-from-an-advanced-standpoint-arithmetic-algebra-analysis-t-rare-book-felix-klein-1685343800bab","title":"Elementary Mathematics from an Advanced Standpoint - Arithmetic, Algebra, Analysis. 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Notable cracking to","brand":"WoB","offers":[{"title":"GB \/ GOOD \/ INTERNAL","offer_id":50087483244817,"sku":"1706772017BAB","price":0.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/4072\/6801\/files\/1706772017BAB_1.jpg?v=1722929927"},{"product_id":"elementary-mathmatics-from-an-advan-book-felix-klein-9780486434810","title":"Elementary Mathmatics from an Advan","description":"These three volumes constitute the first complete English translation of Felix Klein's seminal series Elementarmathematik vom hü¾¦˜¼heren Standpunkte aus. Complete has a twofold meaning here: First, there now exists a translation of volume I into English, while until today the only translation had been into Chinese. Second, the English versions of volume I and I had omitted several, even extended parts of the original, while we now present a complete revised translation into modern English.\u003cbr\u003eThe volumes, first published between 1902 and 1908, are lecture notes of courses that Klein offered to future mathematics teachers, realizing a new form of teacher training that remained valid and effective until today: Klein leads the students to gain a more comprehensive and methodological point of view on school mathematics. The volumes enable us to understand Klein's far-reaching conception of elementarisation, of the elementary from a higher standpoint, in its implementation for school mathematics.\u003cbr\u003eThis volume I presents a paradigmatic realisation of Klein's approach of elementarisation for teacher education. It is shown how the various geometries, elaborated particularly since the beginning of the 19th century, are revealed as becoming unified in a new restructured geometry. 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