中国科学技术大学学报
中國科學技術大學學報
중국과학기술대학학보
Journal of University of Science and Technology of China
2015年
9期
717-720,732
,共5页
f指数调和型函数%梯度估计%刘维尔型定理
f指數調和型函數%梯度估計%劉維爾型定理
f지수조화형함수%제도고계%류유이형정리
f-exponentially harmonic function%gradient estimate%Liouville type theorem
对于光滑的度量测度空间(M,g,e-fdvol),通过使用极大值原理,考虑了 f 指数调和型函数的梯度估计.当Bakry‐Emery Ricci 张量非负并且截面曲率有负下界,可以得到刘维尔型定理.当 f 为常数时,即为文献[Wu J , Ruan Q , Yang Y H . Gradient estimate for exponentially harmonic functions on complete Riemannian manifolds .Manuscripta Mathematica ,2014,143(3‐4):483‐489]中的结果.
對于光滑的度量測度空間(M,g,e-fdvol),通過使用極大值原理,攷慮瞭 f 指數調和型函數的梯度估計.噹Bakry‐Emery Ricci 張量非負併且截麵麯率有負下界,可以得到劉維爾型定理.噹 f 為常數時,即為文獻[Wu J , Ruan Q , Yang Y H . Gradient estimate for exponentially harmonic functions on complete Riemannian manifolds .Manuscripta Mathematica ,2014,143(3‐4):483‐489]中的結果.
대우광활적도량측도공간(M,g,e-fdvol),통과사용겁대치원리,고필료 f 지수조화형함수적제도고계.당Bakry‐Emery Ricci 장량비부병차절면곡솔유부하계,가이득도류유이형정리.당 f 위상수시,즉위문헌[Wu J , Ruan Q , Yang Y H . Gradient estimate for exponentially harmonic functions on complete Riemannian manifolds .Manuscripta Mathematica ,2014,143(3‐4):483‐489]중적결과.
For smooth metric measure spaces (M ,g ,e- f dvol) ,the gradient estimates of positive solutions to the f‐exponentially harmonic functions was considered by using the maximum principle .Then a Liouville type theorem was obtained when the Bakry‐Emery Ricci tensor was nonnegtive and the sectional curvature was bounded by a negative constant .This generalizes a result in Ref .[Wu J , Ruan Q , Yang Y H . Gradient estimates for exponentially harmonic functions on complete Riemannian manifolds .Manuscripta Mathematica ,2014 ,143(3‐4):483‐489] ,w hich is covered in the case w here f is a constant .