陳淑紅
一類非齊次橢圓方程組非常弱解的正則性
陳淑紅
(武夷學院 數學與計算機學院,福建 武夷山 354300)
研究一類非齊次項是-Laplace算子的橢圓方程組非常弱解的正則性。結合Hodge分解以及偏微分方程正則性理論的證明技巧,建立了具有-Laplace型橢圓方程組的非常弱解與經典意義下的弱解之間的關系。
-Laplace型;非常弱解; Hodge分解;正則性
考慮一類非齊次項具有-Laplace算子的橢圓方程組
本文主要研究非齊次橢圓方程組(式(1))非常弱解的正則性。在著名數學家Hilbert于1904年提出的20個公開問題中,涉及解的正則性問題的就有2個,可見正則性研究的重要性,因此也吸引了研究者的廣泛關注和探索,并取得了豐碩的成果[1-5]。
正則性理論的研究大多是在方程(組)存在弱解的情況下進行的,然而,很多具體形式、特定形式的方程(組)在已有研究方法下尚無法獲得經典意義上的弱解,如具有奇異對流的方程組[6]、具有-Laplace型非齊次項的橢圓方程[7]等。
解的存在性仍然是一個懸而未決的問題。
幸運的是,1992年,IWANIEC[9]偶然發(fā)現在廣義積分意義下,解的可積性指標在一定程度上可低于自然增長指標,由此提出了在經典意義下的弱解,即在更廣泛的空間內定義方程弱解,并將其定義為非常弱解。
令
由引理3,可得
由式(9)和式(11),可推得
代入式(13),得
由式(2)和式(3),得
由引理2和等式(10),可以發(fā)現
其中,
由式(10)、Young不等式以及Poincare不等式,有
再利用Young不等式和Poincare不等式,可得
重復上述過程,則由引理4,可得定理1成立。
推論1獲證。
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Regularity of very weak solutions for a class of inhomogeneous elliptic equations
CHEN Shuhong
(,,354300,,)
In this paper, we study the regularity theory of very weak solutions for a class of elliptic equations which inhomogeneous terms are-Laplace operators. Combining Hodge decomposition and the regularity theory of partial differential equations, the relation between the very weak solution of-Laplacian elliptic equations and the weak solution in the classical sense is established.
-Laplace type; very weak solution; Hodge decomposition; regularity
O 175.2
A
1008?9497(2023)01?025?05
2021?09?09.
國家自然科學基金資助項目(11571159);武夷學院引進人才科研啟動項目(YJ202118).
陳淑紅(1979—),ORCID:https://orcid.org/0000-0001-6648-6486,女,博士(后),教授,主要從事偏微分方程研究,E-mail:shiny0320@163.com.