deletions | additions       diff --git a/Introduction.tex b/Introduction.tex  index bfbab13..cbfa254 100644  --- a/Introduction.tex  +++ b/Introduction.tex 
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\end{enumerate}  we propose an edge detection method based on the analysis of eigenvalues of GGT.  \begin{quote}  毛主席说过杀杀杀 All things in their being are good for something.--nobody  \end{quote} Considering the actual geological situation, the positive and negative density bodies usually coexist simultaneously. The proposed \href{http://www.hao123.com}{www.baidu.com}method has designed to outline the positive/negative density bodies with the corresponding values.