Approximation by ridge function fields over compact sets

摘要

We study the approximation of a continuous function field over a compact set Tby a continuous field of ridge approximants over T, named ridge function fields. We first give general density results about function fields and show how they apply to ridge function fields. We next discuss the parameterization of sets of ridge function fields and give additional density results for a class of continuous ridge function fields that admits a weak parameterization. Finally, we discuss the construction of the elements in that class. (C) 2004 Elsevier Inc. All rights reserved.