Product Description: This paper is concerned with the existence and uniform decay rates of solutions of the waveequation with a sourceterm and subject to nonlinear boundary damping ? ? u ?? u =|u| u in ? ×(0,+?) ? tt ? ? ? ? u=0 on ? ×(0,+?) 0 (1. 1) ? ? u+g(u)=0 on ? ×(0,+?) ? t 1 ? ? ? ? 0 1 u(x,0) = u (x); u (x,0) = u (x),x? ? , t n where ? is a bounded domain of R ,n? 1, with a smooth boundary ? = ? ?? ...read more

Product Description: What's the difference between "take-away" subtraction and "difference" subtraction? Do you know? If not, this book is for you. The beautiful photographs and clear language of What's the Difference?, not only helps children with the concept of subtraction but builds greater number sense as well...read more