In a few books on Operations Research, I have found a reference to a method of finding the inverse of matrix using a method called as 'Product Form'. From the context, it looks like the product form method is used for finding the inverse of the basis matrix in a simplex table. The method may or may not work for other kind of matrices. However, I couldn't find a good description of this method. One text which mentions this is "Operations Research" by Hamdy Taha. A description of the method is supposedly given in the CD accompanying the book - but I have a hand me down book & don't have the CD. If anyone here knows more about this method or has a pointer to it, please let me know.