Le Khyu Zien, V. I. Shevchenko, “Homotopy classification of systems in the plane that are elliptic in the sense of Douglis and Nirenberg”, Dokl. Akad. Nauk SSSR, 1979, Volume 244, Number 4,Pages <nobr>824

MATHEMATICS

Homotopy classification of systems in the plane that are elliptic in the sense of Douglis and Nirenberg

Le Khyu Zien, V. I. Shevchenko

V. I. Lenin Belorusskii State University, Minsk

UDC: 517.94

Presented: S. L. Sobolev
Received: 06.03.1978