Acta Numerica anually surveys the most important developments in numerical mathematics and scientific computing. The subjects and authors of the substantive articles are chosen by a distinguished international editorial board, so as to report the most important and timely developments in a manner accessible to the wider community of professionals with an interest in scientific computing. Acta Numerica volumes are a valuable tool not only for researchers and professionals wishing to develop their understanding of numerical techniques and algorithms and follow new developments. They are also used as advanced teaching aids at colleges and universities (many of the original articles are used as the prime resource for graduate courses).