  This paper studies synchronization in coupled nonlinear dynamic networks with
unknown parameters. Adaptation can be added to one or several elements in the
network, while preserving the global synchronization conditions derived in
previously. This implies that new nodes can be added to the network without
prior knowledge of the individual dynamics, and that nodes in an existing
network have the ability to recover dynamic information if temporarily lost. In
addition, when the individual elements feature sufficiently rich stable
dynamics, as e.g. in the case of oscillators, then adaptation actually leads to
an exact estimation of the unknown parameters. Different kinds of leaders are
also discussed in this context - one type of leader can specify overall
trajectories for the network, while another can concurrently specify dynamic
parameters.
