Yau's gradient estimates on Alexandrov spaces

@article{Zhang2010YausGE,
  title={Yau's gradient estimates on Alexandrov spaces},
  author={Huichun Zhang and Xiping Zhu},
  journal={arXiv: Differential Geometry},
  year={2010}
}
In this paper, we establish a Bochner type formula on Alexandrov spaces with Ricci curvature bounded below. Yau's gradient estimate for harmonic functions is also obtained on Alexandrov spaces. 
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