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44 of 45 people found the following review helpful:
5.0 out of 5 stars
I am the Quaternion Book's Author, January 25, 2004
I merely want to share with you an excellent review of my Quaternion Book. The review appeared in the Nov/Dec'03 issue of Contemporary Physics, vol6., and was written by Dr Peter Rowlands, Waterloo University, UK. The review is herewith attached (if I may) otherwise I'll paste the text). It's probably too long --- but you now know where to find it. Here goes:The following Book Review Appeared in Journal: Contemporary Physics}, Nov/Dec 2003, vol 44, no. 6, pages 536 - 537 · · · Quaternions & Rotation Sequences A Primer with Applications to Orbits, Aerospace, and Virtual Reality by JACK B. KUIPERS Princeton University Press. 2002, £24.95(pbk), pp. xxii + 371, ISBN 0 691 10298 8. Scope: Text. Level: Postgraduate and Specialist. } Quaternions are one of the simplest and most powerful tools ever offered to the physicist or engineer. Unfortunately, they are relatively little known because a centuryold prejudice (the result of a family feud involving vector theory) has been responsible for keeping them out of university courses. The fact that quaternions have never really found their true role has become a self-fulfilling prophecy, despite their reappearance in various disguised forms such as Pauli matrices, 4-vectors, and, in a complex double form, in the Dirac gamma algebra. The straightforward manipulation of this relatively simple formalism, however, means that, to a quaternionist, such things as Minkowski space-time and fermionic spin are no longer mysterious unexplained physical concepts but merely inevitable consequences of the fundamental algebraic structure, while even ordinary vector algebra as David Hestenes has shown (Space-Time Algebras, Gordon and Breach, 1966) is much better understood in terms of its quaternionic base. The immense value of the quaternion algebra is that its products are ordinary algebraic products, not the dot or cross products of standard vector algebra, although they also include these concepts. Despite many statements to the contrary, quaternions are by no means short of serious applications, either. Often in highly practical contexts, and, in every application that I know of, where a quaternion formulation is possible, this formulation is invariably superior to any more `conventional' alternative. Kuipers, in his splendid book, effectively shows this in the eminently practical case of the aerospace sequence and great circle navigation by demonstrating how the same calculations are done, first by conventional matrix methods, and then by quaternions. Rather than abstractly defining quaternion algebra and then seeking possible applications, he prepares the ground well by describing the application first, and then developing the quaternion methods which will solve it. It is not until chapter 5, in fact, that quaternion algebra is seriously introduced. However, Kuipers sets this on a firm basis by establishing early on the connection with complex numbers, matrices and rotations. These subjects are discussed with great thoroughness in the early chapters. The work is avowedly a primer, and so nothing is taken for granted. The student can begin at the beginning and follow the argument through stage by stage, with virtually no prior knowledge of the subject. The real core of the mathematical analysis comes in chapters 5 to 7, with solid and relatively easy to follow treatments of quaternion algebra and quaternion geometry, together with an algorithm summary, relating quaternions to such things as direction cosines, Euler angles and rotation operators. The superiority of quaternion over, for example, matrix methods is demonstrated by Kuipers' statement on p. 153 that the quaternion rotation operator (unlike the matrix one) is `singularity-free'. Following the main application to the aerospace sequence and great circle navigation, there are further chapters on spherical trigonometry, quaternion calculus for kinematics and dynamics, and rotations in phase space, with two final chapters devoted to applications in electrical engineering (dipole radiation signals sent by a source to a sensor, and then correlated using a processor) and computer graphics. The final application is especially interesting as quaternions have been behind much of the rapid development of computer graphics. One role that quaternions have always fulfilled is their applicability to 3-dimensional structures, and the otherwise difficult problem of rotation, especially when time-sequencing is involved. Computer software engineers have exploited this while physicists have missed out. The creation of a `natural' 3-dimensionality, using the `vector' or imaginary part of quaternions was, of course, the original reason for their creation; but, while the remaining `scalar' or real part was originally thought of as a problem by the proponents of vector theory, it is now seen as a bonus, allowing the incorporation of time as a natural result of the algebra. We cannot escape the fact that we live in time within a 3-dimensional spatial world, and quaternion algebra appears to be the easiest way of comprehending and manipulating this 3-or 4-dimension- ality. Kuipers shows us examples of the exploitation of the technique in aerodynamics, electrical engineering and computer software design, but it also has relevance in topology, quantum mechanics, and particle physics. It is frankly as absurd for physicists and engineers to neglect quaternions as it would be for them to disregard complex numbers or the minus sign. It is important that students get to learn about this spectacularly simple and powerful technique as early as possible, and Kuipers has provided us with the perfect opportunity of remedying a massive defect in our technical education. His book has everything that one could wish for in a primer. It is also beautifully set out with an attractive layout, clear diagrams, and wide margins with explanatory notes where appropriate. It must be strongly recommended to all students of physics, engineering or computer science. DR PETER ROWLANDS (University of Liverpool)
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