A new volume of philosophical essays by Bernard Williams. The book is a successor to
Problems of the Self, but whereas that volume dealt mainly with questions of personal …

Control theory originated around 150 years ago when the performance of mechanical
governors started to be analysed in a mathematical way. Such governors act in a stable way …

Second order linear parabolic and elliptic equations arise frequently in mathematics and
other disciplines. For example parabolic equations are to be found in statistical mechanics …

THE relative motion of one spacecraft (chaser) with respect to another (target) in a circular
orbit is described by autonomous nonlinear differential equations. The linearized equations …

CONSIDER a spacecraft in a circular orbit and another in its vicinity, which are referred to as
the target and the chaser, respectively. The relative motion of the chaser with respect to the …

The paper characterizes some classes of pseudo-differential operators for which there are
(or there are not) non-constant bounded harmonic functions. Non-local perturbations of …

This paper studies the problem of robust orbital control for low earth orbit (LEO) spacecraft
rendezvous subjects to the parameter uncertainties, the constraints of small-thrust and …

Low-gain feedback has found several applications in constrained control, robust control, and
nonlinear control. In this paper, we first generalize the existing low-gain design methods by …

In this paper null controllability with vanishing energy for discrete-time systems is
considered. As in the case of continuous time systems necessary and sufficient conditions in …

The null controllability problem for a structurally damped abstract wave equation–often
referred to in the literature as a structurally damped equation–is considered with a view …