Über die Zerlegungen von linearen homogenen Differentialoperatoren
Über die Zerlegungen von linearen homogenen Differentialoperatoren in Operatoren erster Ordnung
Über maximale LP-Regularität für Differentialgleichungen in Banach- und Hilbert-Räumen.
Über Störungen kanonischer Differentialgleichungen mit operatorwertigen Koeffizienten und definisierbarem Monodromieoperator.
Uniform convergence of the spectral expansion for a differential operator with periodic matrix coefficients.
Universality of derivative and antiderivative operators with holomorphic coefficients
We prove some conditions on a sequence of functions and on a complex domain for the existence of universal functions with respect to sequences of certain derivative and antiderivative operators related to them. Conditions for the equicontinuity of those families of operators are also studied. The conditions depend upon the "size" of the domain and functions. Some earlier results about multiplicative complex sequences are extended.