Ji-guang Sun Professor Emeritus Department of Computing Science Umeå University SE-901 87 Umeå, SWEDEN Telephone: +46 90 7866125 Telefax: +46 90 7866126 E-mail: jisun@cs.umu.se

Research Interests:

• Matrix perturbation analysis
• Numerical analysis
• Higher-dimensional singular integral equations [Before 1978]
• Higher-dimensional harmonic functions [Before 1978]