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首页> 外文期刊>Differential and integral equations >ON SUPERPOSITION OPERATORS BETWEEN HIGHER-ORDER SOBOLEV SPACES AND A MULTIVARIATE FAà DI BRUNO FORMULA:THE SUBCRITICAL CASE
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ON SUPERPOSITION OPERATORS BETWEEN HIGHER-ORDER SOBOLEV SPACES AND A MULTIVARIATE FAà DI BRUNO FORMULA:THE SUBCRITICAL CASE

机译:关于高阶Sobolev空间与多元FAàDI BRUNO公式之间的叠加算符:次判例

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摘要

In this paper, superposition operators, (N_gu)(x) = g(u(x)), between two arbitrary Sobolev spaces are studied. Sufficient conditions which ensure the well-definedness, the continuity, and the validity of the higher-order chain rule for such operators are given in the subcritical case (see Remark 1.1). As a consequence of these properties, it is proved that N_g(W~(m;p)(?)∩W_0~(k,p)(?)∈W_0~(1,q)(?).
机译:本文研究了两个任意Sobolev空间之间的叠加算子(N_gu)(x)= g(u(x))。在亚临界情况下,给出了确保此类操作符的高阶链规则的定义明确,连续性和有效性的充分条件(请参见备注1.1)。作为这些性质的结果,证明了N_g(W〜(m; p)(α)∩W_0〜(k,p)(α)∈W_0〜(1,q)(α)。

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