The Embedding Problem

Embedding Problems in Symplectic Geometry

Symplectic geometry is the geometry underlying Hamiltonian dynamics, and symplectic mappings arise as time-1-maps of Hamiltonian flows. The spectacular rigidity phenomena for symplectic mappings discovered in the last two decades show that certain things cannot be done by a symplectic mapping. For instance, Gromov's famous "non-squeezing'' theorem states that one cannot map a ball into a thinner cylinder by a symplectic embedding. The aim of this book is to show that certain other things can be done by symplectic mappings. This is achieved by various elementary and explicit symplectic embedding constructions, such as "folding", "wrapping'', and "lifting''. These constructions are carried out in detail and are used to solve some specific symplectic embedding problems. The exposition is self-contained and addressed to students and researchers interested in geometry or dynamics.

Second Language Acquisition

An up-to-date account of the main problems and theoretical and practical issues raised by second language acquisition research. As such, this introduction provides students with a "real" understanding of the fundamental topics in the field and the advances achieved by empirical research.

Embedding Problems and Galois Modules