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Continuity of Convolution of Test Functions on Lie Groups

机译:李群上测试函数卷积的连续性

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摘要

For a Lie group G, we show that the map C_c~∞(G) × C_c~∞(G)→ C_c~∞(G), (γ,η) → γ*η,taking a pair of test functions to their convolution, is continuous if and only if G is σ-compact. More generally, consider r, s, t G N_0 U {∞} with t ≤ r + s, locally convex spaces E_1,E_2 and a continuous bilinear map b: E_1 × E_2 → F to a complete locally convex space F. Let β: C_c~r_c~r(G, E_1) × C_c~s(G, E_2) →C_c~t(G, F), (γ, η→γ* b η be the associated convolution map. The main result is a characterization of those (G, r, s, t, b) for which β is continuous. Convolution of compactly supported continuous functions on a locally compact group is also discussed as well as convolution of compactly supported L~L -functions and convolution of compactly supported Radon measures.
机译:对于李群G,我们证明了C_c〜∞(G)×C_c〜∞(G)→C_c〜∞(G),(γ,η)→γ*η的映射,对其具有一对测试函数卷积,当且仅当G为σ-紧致时,才连续。更一般而言,考虑t≤r + s的r,s,t G N_0 U {∞},局部凸空间E_1,E_2和连续双线性图b:E_1×E_2→F到完整的局部凸空间F。 :C_c〜r_c〜r(G,E_1)×C_c〜s(G,E_2)→C_c〜t(G,F),(γ,η→γ* bη是相关的卷积图。主要结果是a β是连续的(G,r,s,t,b)的特征。还讨论了紧支持的连续函数在局部紧群上的卷积以及紧支持的L〜L函数的卷积和紧卷积支持的Radon措施。

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