Ovcyannikov theorem and hyperdifferential operators.
Series: Notas de matemática -- no. 46.; Notas de matemática (Rio de Janeiro, Brazil) -- no. 46.
Publisher: Instituto de Matemática Pura e Aplicada
Published: 1968
Place of publication: Rio de Janeiro
Language: eng
Number of pages: 238
Subjects: Differential equations, Partial.; Differential equations, Linear.