本文探讨了数学中梯度的基本概念及其意义。通过维基百科和一个中文网站的资料回顾，文章试图重新理解这一核心数学概念，并探究其在相关研究论文中的具体应用。
I saw the term used in a paper, but really cannot remember what it is and what it means. Forgot too much about those basic mathematic concepts...
Here is from wiki: http://en.wikipedia.org/wiki/Gradient
Another is a Chinese website which helps a little: http://sxyd.sdut.edu.cn/gaoshu2/lesson/8.7fangxiangdaoshuyutidu.htm
Now it is time to see what it means in the paper...
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