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考察了带有非零 Killing 旋量黎曼 Spin 流形的某类极小子流形.特别地,给出了这类流形中闭全测地超曲面的一个刻画.在对定理的证明过程中,Lichnerowicz 型公式起到了重要的作用. 相似文献
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对于Hamiltonian极小和具有共形Maslov形式的Lagrangian图,建立了Bernstein型的定理,推广了已知关于极小Lagrangian子流形的一些结果. 相似文献
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Quaternion-Kähler twistor operators are introduced. Using these operators with the Lichnerowicz formula, we get lower bounds for the square of the eigenvalues of the Dirac operator in terms of the eigenvalues of the fundamental 4-form. 相似文献
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We adapt the method of moving planes in order to obtainsymmetry results for positive solutions of some elliptic equations onmanifolds, in the case where our problem satisfies certain symmetryhypothesis. We also obtain monotonicity results using the slidingmethod. 相似文献
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Each of the groups in the class under consideration in the paper is presented by one defining relation depending on three integral parameters and is an HNN-extension of some Baumslag—Solitar group. Necessary and sufficient conditions for two groups of this class to be isomorphic and also for two nonisomorphic groups to be homomorphic images of each other are obtained. A consequence of this fact is the negative answer to Question 3.33 in “The Kourovka Notebook.” 相似文献