Banach spaces, as complete normed vector spaces, form a central framework in modern functional analysis. Their rich geometric structure underpins much of the theoretical development in approximation ...

A comparison and evaluation is made of recent proposals for multivariate matched sampling in observational studies, where the following three questions are answered: (1) Algorithms: In current ...

We consider the problem of approximating a given element f from a Hilbert space $\scr{H}$ by means of greedy algorithms and the application of such procedures to the regression problem in statistical ...