Evolution and Optimum Seeking

Multidimensional Strategies 85
method because the squared sum of residuals de nes a multimodal function.
Reference has been made to a number of publications in this and the preceding chapter
in which strategies are described that can hardly be called genuine hill climbing methods
they would fall more naturally under the headings of mathematical programming or
functional optimization. It was not, however, the intention to give anintroduction to the
basic principles of these two very wide subjects. The interested reader will easily nd out
that although a nearly exponentially increasing number of new books and journals have
become available during the last three decades, she or he will look in vain for new direct
search strategies in that realm. Such methods form the core of this book.