How to get the Inverse matrix in symbolic way?

*To*: mathgroup at smc.vnet.net*Subject*: [mg114422] How to get the Inverse matrix in symbolic way?*From*: lightnation <lightnation at naver.com>*Date*: Sat, 4 Dec 2010 06:11:59 -0500 (EST)

The attached file is for getting the inverse matrix in the symbolic way, in the power system. http://blog.daum.net/lightnation?t__nil_loginbox=blog_btn&nil_id=1 You can see the message "Mathematica Kernel has been shut down." after running this file, or only to find the file running infinitely. If Mathematica cannot get the inverse matrix, I'd be very disappointed, because this matrix is very important for the power system analysis.