| dbo:abstract |
Als Matrixkoeffizienten bezeichnet man im mathematischen Gebiet der Darstellungstheorie gewisse zu einer Gruppendarstellung assoziierte Funktionen auf der Gruppe. Zum Beispiel kann man nach Wahl einer Basis im die Darstellung durch den Gruppenelementen zugeordnete Matrizen beschreiben, deren einzelne Einträge Matrixkoeffizienten im Sinne der allgemeinen Definition sind. (de) In mathematics, a matrix coefficient (or matrix element) is a function on a group of a special form, which depends on a linear representation of the group and additional data. Precisely, it is a function on a compact topological group G obtained by composing a representation of G on a vector space V with a linear map from the endomorphisms of V into V 's underlying field. It is also called a representative function. They arise naturally from finite-dimensional representations of G as the matrix-entry functions of the corresponding matrix representations. The Peter–Weyl theorem says that the matrix coefficients on G are dense in the Hilbert space of square-integrable functions on G. Matrix coefficients of representations of Lie groups turned out to be intimately related with the theory of special functions, providing a unifying approach to large parts of this theory. Growth properties of matrix coefficients play a key role in the classification of irreducible representations of locally compact groups, in particular, reductive real and p-adic groups. The formalism of matrix coefficients leads to a generalization of the notion of a modular form. In a different direction, mixing properties of certain dynamical systems are controlled by the properties of suitable matrix coefficients. (en) 数学における行列要素（ぎようれつようそ、英: matrix element）、成分 (matrix entry) あるいは係数 (matrix coefficient) は、群上の特別な形の函数で、その群の線型表現と付加的なデータに依存するものである 有限群に対する行列要素は、その群の元の特定の表現に関する作用に対応する行列の成分として表すことができる。 リー群の表現の行列要素は、特殊函数論と緊密な関係を持ち、理論の大部分を統一的に扱う方法を与える。行列要素の増加性質は、局所コンパクト群（特に簡約実および p-進群）の既約表現の分類において重大な役割を持つ。行列要素を用いた方法論は、モジュラー形式の概念に莫大な一般化をもたらした。別な方向では、ある種の力学系の持つが、適当な行列要素の性質によって制御される。 (ja) |
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Als Matrixkoeffizienten bezeichnet man im mathematischen Gebiet der Darstellungstheorie gewisse zu einer Gruppendarstellung assoziierte Funktionen auf der Gruppe. Zum Beispiel kann man nach Wahl einer Basis im die Darstellung durch den Gruppenelementen zugeordnete Matrizen beschreiben, deren einzelne Einträge Matrixkoeffizienten im Sinne der allgemeinen Definition sind. (de) 数学における行列要素（ぎようれつようそ、英: matrix element）、成分 (matrix entry) あるいは係数 (matrix coefficient) は、群上の特別な形の函数で、その群の線型表現と付加的なデータに依存するものである 有限群に対する行列要素は、その群の元の特定の表現に関する作用に対応する行列の成分として表すことができる。 リー群の表現の行列要素は、特殊函数論と緊密な関係を持ち、理論の大部分を統一的に扱う方法を与える。行列要素の増加性質は、局所コンパクト群（特に簡約実および p-進群）の既約表現の分類において重大な役割を持つ。行列要素を用いた方法論は、モジュラー形式の概念に莫大な一般化をもたらした。別な方向では、ある種の力学系の持つが、適当な行列要素の性質によって制御される。 (ja) In mathematics, a matrix coefficient (or matrix element) is a function on a group of a special form, which depends on a linear representation of the group and additional data. Precisely, it is a function on a compact topological group G obtained by composing a representation of G on a vector space V with a linear map from the endomorphisms of V into V 's underlying field. It is also called a representative function. They arise naturally from finite-dimensional representations of G as the matrix-entry functions of the corresponding matrix representations. The Peter–Weyl theorem says that the matrix coefficients on G are dense in the Hilbert space of square-integrable functions on G. (en) |
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