<i>C</i>-numerical ranges and<i>C</i>-numerical radii

Abstract

Abstract In this paper, we give a brief survey on C-numerical ranges and C-numerical radii. New results are obtained and open problems are mentioned. ∗Research supported by NSF grant DMS 91 00344 and a Caculty research grant of The College of William and Mary. ∗Research supported by NSF grant DMS 91 00344 and a Caculty research grant of The College of William and Mary. Notes ∗Research supported by NSF grant DMS 91 00344 and a Caculty research grant of The College of William and Mary.