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arXiv 2103.08928math.AP
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一类新的双相变指数问题:存在唯一性

A new class of double phase variable exponent problems: Existence and uniqueness

Ángel Crespo-Blanco, Leszek Gasiński, Petteri Harjulehto, Patrick Winkert

摘要:

本文引入了一类新的由变指数双相算子驱动的拟线性椭圆型方程。我们证明了相应的Musielak-Orlicz索伯列夫空间的某些性质(等价范数,一致凸性,关于模的Radon-Riesz性质)和新的双相算子的性质(连续性,严格单调性,(S $_+$)-性质).与已知的常数指数情况相比,我们能够削弱对数据的假设。最后,我们证明了相应的椭圆型方程的存在性和唯一性的右手边,有梯度依赖(所谓的对流项)在非常一般的假设下的数据。作为独立兴趣的结果,我们还显示了光滑函数的密度在新的Musielak-Orlicz索伯列夫空间,即使当该区域是无界的。

英文摘要:

In this paper we introduce a new class of quasilinear elliptic equations driven by the so-called double phase operator with variable exponents. We prove certain properties of the corresponding Musielak-Orlicz Sobolev spaces (an equivalent norm, uniform convexity, Radon-Riesz property with respect to the modular) and the properties of the new double phase operator (continuity, strict monotonicity, (S$_+$)-property). In contrast to the known constant exponent case we are able to weaken the assumptions on the data. Finally we show the existence and uniqueness of corresponding elliptic equations with right-hand sides that have gradient dependence (so-called convection terms) under very general assumptions on the data. As a result of independent interest, we also show the density of smooth functions in the new Musielak-Orlicz Sobolev space even when the domain is unbounded.

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