Pruitt’s estimates on the expectation and the distribution of the time taken by a random walk to exit a ball of radius r are extended to the infinite dimensional setting. It is shown that they separate into two pairs of estimates depending on whether the space is type 2 or cotype 2. It is further shown that these estimates characterize type 2 and cotype 2 spaces.

In this paper, we introduce and study the localization of stability and p-frame properties of a finitely generated shiftinvariant system in the Fourier domain, and then provide more information to that shift invariant system. Especially for a shiftinvariant system generated by finitely many compactly supported functions, we show that it has p-frame property at almost all frequencies, and that i...

In this paper, we present an algorithm for partitioning any given 2d domain into regions suitable for quadrilateral meshing. It can deal with multi-domain geometries with ease, and is able to preserve the symmetry of the domain. Moreover, this method keeps the number of singularities at the junctions of the regions to a minimum. Each part of the domain, being four-sided, can then be meshed usin...