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Title: A very good book in the diffcult field
Review: The book deals with the way of development of programs using mathematical principles. This line of observation ( mentioned in the preface) " One can not learn to write large programs effectively until one has learned to write small ones effectively" captures the motivation of the book. There are three parts; part I introduces predicate logic; it includes natural deduction system; Part II builds the mathematical treatment of the programming constructs like assignment, alternative, iterative command and procedure call. Part III shows how programs are developed and proved correct using the mathematical principles discussed earlier. Given the nature of the area, the book is written with a lot of attention to instructional impact. The best recommendation for the book is by Dijkstra: The topic deserves no less author... To get the message across requires a scientist that combines his scientific involvement in the subject with the precious gifts of a devoted teacher".
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