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Second order equations with nonnegative characteristic form constitute a new branch of the theory of partial differential equations, having arisen within the last 20 years, and having undergone a particularly intensive development in recent years. An equation of the form (1) is termed an equation of second order with nonnegative characteristic form on a set G, kj if at each point x belonging to G we have a (xHk~j ~ 0 for any vector ~ = (~l' ... '~m)' In equation (1) it is assumed that repeated indices are summed from 1 to m, and x = (x l' ••• , x ). Such equations are sometimes also called degenerating m elliptic equations or elliptic-parabolic equations. This class of equations includes those of elliptic and parabolic types, first order equations, ultraparabolic equations, the equations of Brownian motion, and others. The foundation of a general theory of second order equations with nonnegative characteristic form has now been established, and the purpose of this book is to pre sent this foundation. Special classes of equations of the form (1), not coinciding with the well-studied equations of elliptic or parabolic type, were investigated long ago, particularly in the paper of Picone [105], published some 60 years ago.
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Bibliographic Information
Book Title: Second-Order Equations With Nonnegative Characteristic Form
Authors: O. A. Oleĭnik, E. V. Radkevič
DOI: https://doi.org/10.1007/978-1-4684-8965-1
Publisher: Springer New York, NY
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eBook Packages: Springer Book Archive
Copyright Information: American Mathematical Society, Providence, Rhode Island and Plenum Press, New York 1973
Softcover ISBN: 978-1-4684-8967-5Published: 30 April 2012
eBook ISBN: 978-1-4684-8965-1Published: 06 December 2012
Edition Number: 1
Number of Pages: VII, 259
Topics: Analysis