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arxiv: 1706.06249 · v1 · pith:ERB5XWY6new · submitted 2017-06-20 · 🧮 math.DG

On the Li-Yau type gradient estimate of Li and Xu

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keywords estimategradientli-yautypeli-xuobtainargumentcases
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In this paper, we obtain a Li-Yau type gradient estimate with time dependent parameter for positive solutions of the heat equation, so that the Li-Yau type gradient estimate of Li-Xu are special cases of the estimate. We also obtain improvements of Davies' Li-Yau type gradient estimate. The argument is different with those of Li-Xu and Qian.

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