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4.5
Reichenbach writes with clarity, reason and passion on a topic that is in much need of this still today. It is accessible to the astute layperson - there is some occasional math, but the text handles most of the important concepts. It is useful for anyone interested in the combined scientific and philosophical perspective of space and time.Reichenbach, in the Introduction, rues the current estrangement of philosophy and science, longing for the "natural philosophy" of the past, where thinkers were well-versed in both areas.So this book takes us through the philosophy of space and time accompanied and supported by empirical and theoretical scientific work. He seems to have little in the way of agenda or "-isms" to tout, nor is he inclined to spend much ink on rehashing historical debates or trivial examples. And although the book winds it way eventually to General Relativity, we are thankfully not dragged through the typical "Aristotlean view -> Galilean view -> Einsteinian view" that is so commonly used.Instead, he begins by discussing Euclidean space, the nature of geometry and so on. Throughout, the notion of topology is a common thread. Time, simultaneity, Lorentz, Principle of Equivalence, and gravitational effects on the topology of spacetime, are some of the steps through the book.In section 39, for example, he guides us on a detour entitled "The Analytic Treatment of Reimannian Spaces", just to carry "...the treatment of general geometry a little further." In four short pages and a modicum of equations, the nature of tensors as a natural mathematical consequence appear, effortlessly and painlessly.All along, woven in, are cogent philosophical treatments of the topic currently under discussion. The book is a good example of the author's desire to see philosophy and science melded again, and good example of his prowess in both areas.
