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A semi-inner-product is a generalization of inner products. It was introduced to mathematics by Günter Lumer〔.〕 for the purpose of extending Hilbert space type arguments to Banach spaces in functional analysis. Fundamental properties were later explored by Giles.〔J. R. Giles, Classes of semi-inner-product spaces, Transactions of the American Mathematical Society 129 (1967), 436–446.〕 ==Definition== The definition presented here is different from that of the "semi-inner product" in standard functional analysis textbooks,〔J. B. Conway. A Course in Functional Analysis. 2nd Edition, Springer-Verlag, New York, 1990, page 1.〕 where a "semi-inner product" satisfies all the properties of inner products (including conjugate symmetry) except that it is not required to be strictly positive. A semi-inner-product for a linear vector space over the field of complex numbers is a function from to , usually denoted by , such that # , # # # # 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Semi-inner-product」の詳細全文を読む スポンサード リンク
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