Место издания:American mathematical society, providence, rhode island plenum press, New York-London
Объём:
259 страниц
ISBN:0-306-30751-0
Монография
Аннотация:In the past years the study of second order equations with nonnegative charactiristic form has developed into a new and impotant branch of partial differential equations. Providing the formulations of general theory, this comprehenhsive volume rewiews the literature to date and advences innovative theorems on problem in this field