deletions | additions       diff --git a/Introduction.tex b/Introduction.tex  index a95d194..010d74a 100644  --- a/Introduction.tex  +++ b/Introduction.tex 
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\url{http://www.math.washington.edu/~morrow/mcm/uw25.pdf}  \url{http://web.archive.org/web/20140715223826/http://bendwavy.org/sphere.htm}  \subsection{Problem} \subsection{Restatement of the Problem}  The problem is that the Gamma Knife radiosurgery can be inaccurate and when it is inaccurate, it can bear dangerous consequences, namely harming healthy brain tissue.