A retrospective on research visits of Paul Butzer's Aachen research group to North America and Western Europe

摘要

After the appearance of the article "A retrospective on 60 years of approximation theory and associated fields" (J. Approx. Theory 160 (1-2) (2009) 3-18), several readers informed me (PLB) that they would like to see an article based upon research contacts and conference participations of members of the chair "Lehrstuhl A ftir Mathematik" at Aachen throughout the world. The present paper is devoted to the research visits of members of the Aachen research group to America and Western Europe. The countries covered are USA and Canada, Austria, Netherlands, Belgium, Switzerland, Sweden, England and Scotland, Italy, Spain, Portugal, Norway, Greece, and Ireland. (C) 2020 Elsevier Inc. All rights reserved.