摘要
设M是m(3)维完备单连通的黎曼流形,它的截曲率非正.本文证明了:如果M的径向Ricci算子的特征值差异不大(定义见文中),则从M到任何黎曼流形的能量有限或慢发散的调和映照必是常值映照.此结果改进了有关的已知结果并给出了更一般的条件.
出处
《数学年刊(A辑)》
CSCD
北大核心
1997年第3期307-312,共6页
Chinese Annals of Mathematics
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