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"This book presents a hierarchical framework about important theoretical issues that are present in psychological thinking. These issues concern definitions of three major theoretical concepts in theory and practice : (a) paradigms, (b) theories, and (c) models. It focuses on defining, comparing, and contrasting these three conceptual terms. This framework clarifies differences among paradigms, theories, and models, terms which have become increasingly confused in the psychological literature. Paradigms are usually confused with theories or with models while theories are confused with models. Examples of misuses of these terms suggest the need for a hierarchical structure that views paradigms as conceptual constructions overseeing a variety of psychological theories and verifiable models."

"The general theory of relativity : a mathematical exposition will serve readers as a modern mathematical introduction to the general theory of relativity. Throughout the book, examples, worked-out problems, and exercises (with hints and solutions) are furnished. Topics in this book include, but are not limited to tensor analysis, the special theory of relativity, the general theory of relativity and Einstein’s field equations, spherically symmetric solutions and experimental confirmations, static and stationary space-time domains, black holes, cosmological models, algebraic classifications and the Newman Penrose equations, and the coupled Einstein-Maxwell-Klein-Gordon equations appendices covering mathematical supplements and special topics."