John G. Harris intended to explain in this book the special techniques required to model the radiation and diffraction of elastic and surface waves. Sadly, he died before he could fulfil this ambition, but his plan has been brought to fruition by a team of his distinguished collaborators. The book begins with the basic underlying equations for wave motion and then builds upon this foundation by solving a number of fundamental scattering problems. The remaining chapters provide a thorough introduction to modern techniques that have proven essential to understanding radiation and diffraction at high frequencies. Graduate students, researchers and professionals in applied mathematics, physics and engineering will find that the chapters increase in complexity, beginning with plane-wave propagation and spectral analyses. Other topics include elastic wave theory, the Wiener-Hopf technique, the effects of viscosity on acoustic diffraction, and the phenomenon of channelling of wave energy along guided structures.

In Art versus Nonart, Tsion Avital poses the question: 'Is modern art art at all?' He argues that much, if not all, of the nonrepresentational art produced in the twentieth century was not art, but rather the debris of the visual tradition it replaced. Modern art has thrived on the total confusion between art and pseudo-art and the inability of many to distinguish between them. As Avital demonstrates, modern art has served as a critical intermediate stage between art of the past and the future. This book, first published in 2003, proposes a distinct way to define art, anchoring the nature of art in the nature of the mind, solving a major problem of art and aesthetics for which no solution has yet been provided. The definition of art proposed in this book paves the way for a fresh and promising paradigm for future art.

Wave propagation and scattering are among the most fundamental processes that we use to comprehend the world around us. While these processes are often very complex, one way to begin to understand them is to study wave propagation in the linear approximation. This is a book describing such propagation using, as a context, the equations of elasticity. Two unifying themes are used. The first is that an understanding of plane wave interactions is fundamental to understanding more complex wave interactions. The second is that waves are best understood in an asymptotic approximation where they are free of the complications of their excitation and are governed primarily by their propagation environments. The topics covered include reflection, refraction, the propagation of interfacial waves, integral representations, radiation and diffraction, and propagation in closed and open waveguides.

Tsion Avital poses the question: "Is modern art--art at all?" He argues that the nonrepresentational art produced in the twentieth century was not actually art, but rather the debris of the visual tradition it replaced. Modern art has thrived on the state of total confusion existing between art and pseudo-art and the inability of many to distinguish between them. As Avital demonstrates, modern art has served as a critical intermediate stage between art of the past and the future.

Wave propagation and scattering are among the most fundamental processes that we use to comprehend the world around us. While these processes are often very complex, one way to begin to understand them is to study wave propagation in the linear approximation. This is a book describing such propagation using, as a context, the equations of elasticity. Two unifying themes are used. The first is that an understanding of plane wave interactions is fundamental to understanding more complex wave interactions. The second is that waves are best understood in an asymptotic approximation where they are free of the complications of their excitation and are governed primarily by their propagation environments. The topics covered include reflection, refraction, the propagation of interfacial waves, integral representations, radiation and diffraction, and propagation in closed and open waveguides.