On transformations of self-adjoint linear differential systems and their reciprocals
Sixty years of professor František Neuman
Representation of solutions of general linear differential systems of the second order
On conjugate points of solutions of non-selfadjoint differential systems
On transformations of self-adjoint linear differential systems
Transformations of linear Hamiltonian systems preserving oscillatory behaviour
Riccati matrix differential equation and classification of disconjugate differential systems
The basic properties of phase matrices of linear differential systems
Second phase matrix of differential systems
Phase matrix of linear differential systems
On some properties of trigonometric matrices
Oscillatory properties of fourth order Sturm-Liouville differential equations
Methods of oscillation theory of half-linear second order differential equations
In this paper we investigate oscillatory properties of the second order half-linear equation Using the Riccati technique, the variational method and the reciprocity principle we establish new oscillation and nonoscillation criteria for (*). We also offer alternative methods of proofs of some recent oscillation results.
Sixty years of professor František Neuman
On some problems in the oscillation theory of self-adjoint linear differential equations
On the existence of conjugate points for linear differential systems
The multiplicity criteria for zero points of second order differential equations
A remark on polyconvex envelopes of radially symmetric functions in dimension
We study polyconvex envelopes of a class of functions related to the function of Kohn and Strang introduced in . We present an example of a function of this class for which the polyconvex envelope may be computed explicitly and we also point out some general features of the problem.
On the Liouville-type transformation for differential systems
A remark on conjugacy of half-linear second order differential equations
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