Wells, Wilf

The eigenvalue theorem, a standard topic in any linear algebra text and mathematics book, is particularly well presented by Dixon,33 Wilf,34 and Nicholson.35... 

In 1982 Pains moved again, this time to the site of an old chalkpit in Whiteparish near Salisbury where the Decker family continue to own and promote the business and where Wilf Wells, a former Wells director, spent his remaining years. 

This procedure transforms the ill-conditioned problem of finding the roots of a polynomial into the well-conditioned problem of finding the eigenvalues and eigenvectors of a tridiagonal symmetric matrix. As shown by Wilf (1962), the N weights can then be calculated as Wa = OToV ai where tpai is the first component of the ath eigenvector (pa of the Jacobi matrix. 

Last, there is information theory and there is algorithmic information theory. The reader is encouraged to consult the classic text by Chaitin [15]. Wilf also presents a rigorous treatment of algorithms and information contexts [16]. Zurek has explored the subject in detail as well [17,18]. 

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