Cognitive spatial concepts are qualitative in nature, i.e., they are based not so much on exact quantities but on comparisons between perceived magnitudes. We develop a qualitative model for the representation of spatial knowledge (in particular, of positional information about 2-dimensional projections) that is based only on locative...

While books and journals of high quality have proliferated in discrete and compu- tational geometry during recent years, there has been to date no single reference work fully accessible to the nonspecialist as well as to the specialist, covering all the major aspects of both fields. The Handbook of Discrete and Computational Geometry...

This monograph on Security in Computing Systems: Challenges, Approaches and Solutions aims at introducing, surveying and assessing the fundamentals of secu rity with respect to computing. Here, “computing” refers to all activities which individuals or groups directly or indirectly perform by means of computing sys tems,...

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Thinking in terms of facts and rules is perhaps one of the most common ways of approaching problem definition and problem solving both in everyday life and under more formal circumstances. The best known set of rules, the Ten Commandments have been accompanying us since the times of Moses; the Decalogue proved to be simple but...

This dictionary is one of a series designed for use in schools. It is intended for students of chemistry, but we hope that it will also be helpful to other science students and to anyone interested in science. Facts On File also publishes dictionaries in a variety of disciplines, including biology, physics, mathematics, forensic science,...