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Titel: Hypercomplex Numbers: An Elementary ...
Verlag: Springer-Verlag, New York, New York, U.S.A.
Illustrator: Trans.: Shenitzer, A.
Zustand: Very Good
Zustand des Schutzumschlags: No Dust Jacket
Auflage: First English Edition, First Printing.
Art des Buches: Clean Copy
Yellow cover with brown lettering on spine and upper board and contents in very good clean condition. Spine is lightly sun faded. Previous owner's name and address on front inside cover. Buchnummer des Verkäufers 191334
Inhaltsangabe: This book deals with various systems of "numbers" that can be constructed by adding "imaginary units" to the real numbers. The complex numbers are a classical example of such a system. One of the most important properties of the complex numbers is given by the identity (1) Izz'l = Izl·Iz'I· It says, roughly, that the absolute value of a product is equal to the product of the absolute values of the factors. If we put z = al + a2i, z' = b+ bi, 1 2 then we can rewrite (1) as The last identity states that "the product of a sum of two squares by a sum of two squares is a sum of two squares. " It is natural to ask if there are similar identities with more than two squares, and how all of them can be described. Already Euler had given an example of an identity with four squares. Later an identity with eight squares was found. But a complete solution of the problem was obtained only at the end of the 19th century. It is substantially true that every identity with n squares is linked to formula (1), except that z and z' no longer denote complex numbers but more general "numbers" where i,j, . . . , I are imaginary units. One of the main themes of this book is the establishing of the connection between identities with n squares and formula (1).
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