ABSTRACT
This chapter covers the concept of sets and how it is entwined with classical' variants of logic. Information retrieval as it is commonly abbreviated, is the science of searching for documents, for information within documents, and for metadata about documents, as well as that of searching relational databases and the World Wide Web. Time for a refresh. All the material presented in the chapter so far has been a brief lead in to explain how contemporary information retrieval techniques exploit thinking from the field of quantum mechanics. Now, to reformulate we must first conjure up an informational or computational semantic space with a fixed set of dimensions, n. As the inventor of Boolean logic, which is the basis of modern digital computer logic, Boole is regarded in hindsight as one of the founders of the field of computer science. Metric spaces used metric function remains the Euclidean distance function derived from Pythagoras' theorem.
