Penulis: P. Lounesto

This volume is dedicated to the memory of Albert Crumeyrolle, who died on June 17, 1992. In organizing the volume we gave priority to: articles summarizing Crumeyrolle’s own work in differential geom …

Marcellliesz’s lectures delivered on October 1957 -January 1958 at the Uni- versity of Maryland, College Park, have been previously published only infor- mally as a manuscript entitled CLIFFORD NUMBE …