Abstract
In this note, using Γ2 (Bakry–Emery curvature operator) and the classical maximum principle, we establish a comparison estimate for a general elliptic operator on a manifold, without using Jacobi field theory.
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Qian, Z. A Comparison Theorem for an Elliptic Operator. Potential Analysis 8, 137–142 (1998). https://doi.org/10.1023/A:1008698923961
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DOI: https://doi.org/10.1023/A:1008698923961