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Pfaff's Problem and Its Generalizations
In its simplest form, the Pfaff problem (formulated by Pfaff in 1819) consists of determining the maximal integrable manifold of a Pfaffian system, that is of a system of vector fields in $R^n$. This book offers a solution of this problem and discusses various generalizations, giving an essentially treatment of the theory as it was known in 1949.
