The analysis of parameter-dependent nonlinear has received much
attention in recent years. Numerical continuation techniques allow the
efficient computation of solution branches in a one-parameter problem.
In many cases continuation procedures are used as part of a more
complete analysis of a nonlinear problem, based on bifurcation theory
and singularity theory. These theories contribute to the understanding
of many nonlinear phenomena in nature and they form the basis for
various analytical and numerical tools, which provide qualitative and
quantitative results about nonlinear systems. In this issue we have
collected a number of papers dealing with continuation techniques and
bifurcation problems. Readers familiar with the notions of continuation
and bifurcation will find recent research results addressing a variety
of aspects in this issue. Those who intend to learn about the field or a
specific topic in it may find it useful to first consult earlier
literature on the numerical treatment of these problems together with
some theoretical background. The papers in this issue fall naturally
into different groups.