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Titlebook: Quadratic Forms in Infinite Dimensional Vector Spaces; Herbert Gross Book 1979 Springer Science+Business Media New York 1979 algebra.Divis

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发表于 2025-3-21 18:02:43 | 显示全部楼层 |阅读模式
书目名称Quadratic Forms in Infinite Dimensional Vector Spaces
编辑Herbert Gross
视频video
丛书名称Progress in Mathematics
图书封面Titlebook: Quadratic Forms in Infinite Dimensional Vector Spaces;  Herbert Gross Book 1979 Springer Science+Business Media New York 1979 algebra.Divis
描述For about a decade I have made an effort to study quadratic forms in infinite dimensional vector spaces over arbitrary division rings. Here we present in a systematic fashion half of the results found du­ ring this period, to wit, the results on denumerably infinite spaces (" NO-forms‘‘‘). Certain among the results included here had of course been published at the time when they were found, others appear for the first time (the case, for example, in Chapters IX, X , XII where I in­ clude results contained in the Ph.D.theses by my students W. Allenspach, L. Brand, U. Schneider, M. Studer). If one wants to give an introduction to the geometric algebra of infinite dimensional quadratic spaces, a discussion of N-dimensional O spaces ideally serves the purpose. First, these spaces show a large number of phenomena typical of infinite dimensional spaces. Second, most proofs can be done by recursion which resembles the familiar pro­ cedure by induction in the finite dimensional situation. Third, the student acquires a good feeling for the linear algebra in infinite di­ mensions because it is impossible to camouflage problems by topological expedients (in dimension NO it is easy to see, in
出版日期Book 1979
关键词algebra; Division; Finite; language; linear algebra; proof; quadratic form; recursion; ring; time; Vector spac
版次1
doihttps://doi.org/10.1007/978-1-4899-3542-7
isbn_softcover978-0-8176-1111-8
isbn_ebook978-1-4899-3542-7Series ISSN 0743-1643 Series E-ISSN 2296-505X
issn_series 0743-1643
copyrightSpringer Science+Business Media New York 1979
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发表于 2025-3-21 22:11:18 | 显示全部楼层
Classification of Subspaces in Spaces with Definite Forms,for all x, y ∈ k.: or k is a quaternion algebra . with k. ordered, α, β < 0 and τ being the usual “conjugation”. If τ = 1, possible only when k is commutative, then ϕ is symmetric and k = k. is ordered.
发表于 2025-3-22 03:02:51 | 显示全部楼层
Introduction,s (see References to Chapter XI) there has been, as far as we know, only Kaplansky’s 1950 paper on infinite dimensional spaces pointing our way, namely in the direction of a purely algebraic theory of quadratic forms on infinite dimensional vector spaces over “arbitrary” division rings. Such a theor
发表于 2025-3-22 06:48:12 | 显示全部楼层
Fundamentals on Sesquilinear Forms,hat are used throughout the text. A number of fundamental definitions have been inserted in later chapters; whenever it had been possible to introduce a concept right where it is needed without interrupting the flow of ideas we have postponed its introduction.
发表于 2025-3-22 09:22:52 | 显示全部楼层
,Diagonalization of א0-Forms,ecomposition into mutually orthogonal lines is impossible. The problem of “normalizing” bases brings us to stability and the beginner is confronted with the first Ping-Pong style proof with its characteristic back-and-forth argument (Theorem 2). These matters are basic and their knowledge is tacitly
发表于 2025-3-22 15:49:42 | 显示全部楼层
Classification of Hermitean Forms in Characteristic 2,he additive subgroups S ≔ {α ∈ k|α = εα*} and T ≔ {α + εα*|α ∈ k} of “symmetric” elements and of “traces” respectively. The factor group S/T is a k-left vectorspace under the composition λ (σ+T) = λσλ* + T (σ ∈ S, λ ∈ k). ̂: S → S/T is the canonical map.
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发表于 2025-3-23 03:17:37 | 显示全部楼层
Classification of Subspaces in Spaces with Definite Forms,it follows from Dieudonné’s lemma that k is either a quadratic extension k = k. (γ) over an ordered field (k., <) with 0 > γ. ∈ k. and (x+yγ). = x-yγ for all x, y ∈ k.: or k is a quaternion algebra . with k. ordered, α, β < 0 and τ being the usual “conjugation”. If τ = 1, possible only when k is com
发表于 2025-3-23 09:35:41 | 显示全部楼层
Quadratic Forms, partly overlap (cf. Example 2 in Section 3 below). For the purpose of illustration we start with the classical notion of a quadratic form . on a k-vector space E over a commutative field k of arbitrary characteristic. The map Q is called a quadratic form if 1) we have Q(λx) = λ.Q(x) for all λ ∈ k,
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