Asymptotic methods are of great importance for practical applications, especially in dealing with boundary value problems for small stochastic perturbations. This book deals with nonlinear dynamical systems perturbed by noise. It addresses problems in which noise leads to qualitative changes, escape from the attraction domain, or extinction in population dynamics. The most likely exit point and expected escape time are determined with singular perturbation methods for the corresponding Fokker-Planck equation. The authors indicate how their techniques relate to the Ito calculus applied to the...

The book reviews recent developments in the field of deep inelastic electron-proton reactions at high momentum transfers. These studies have been made feasible by the high-statistics "ep" collision data collected by the experiments ZEUS and H1 at the HERA accelerator at DESY. The standard model framework for describing deep inelastic scattering and scenarios beyond the standard model, as well as the experimental situation, is discussed, and the experimental results are collected and confronted with the theoretical predictions.