Geodesic

Volume 25 (1989) no. 4

Sommaire

New frequency criteria for the absolute stability and instability of automatic control systems with nonstationary nonlinearity
p. 555-563
Divergence of normalizing transformations in the case of real structurally unstable focus
p. 563-573
A boundary value problem for fourth-order ordinary differential equations
p. 573-578
Estimates for the growth of solutions of differential equations
p. 578-588
Some uniqueness theorems in inverse problems of spectral analysis for Sturm--Liouville operators in the case of the Weyl limit circle
p. 588-599
The central exponent of a linear system of differential equations
p. 599-604
The problem of the stability of singular points on the plane from the point of view of algebraic and analytic solvability
p. 605-610
Oscillation and nonoscillation of solutions of first-order linear differential equations with deviating argument
p. 611-616
Analytic solution of a linear functional-differential equation with linear deviation of the argument
p. 616-626
Normal forms and regularization of nonlinear singularly perturbed evolution equations
p. 627-635
Classes of third-order systems with quadratic right-hand sides without moving critical points
p. 635-640
Optimal control of linear loaded parabolic equations
p. 641-651
Symmetrization of a hyperbolic equation
p. 652-659
Smoothness of parabolic Pagni potentials. II. Proof of theorems on smoothness of direct values of Pagni potentials
p. 659-674
Self-oscillatory solutions of a class of singularly perturbed boundary value problems
p. 674-685
$K$-limits of solutions of second-order quasilinear elliptic equations
p. 686-692
Estimates for the Green function and for solutions of the second mixed problem for a parabolic equation
p. 692-703
Solvability of a boundary value problem for hyperbolic equations in nonclassical domains
p. 704-716
Some expansions of arbitrary functions in integrals with respect to spherical functions
p. 716-721
Necessary conditions for the basis property in the direct sum of Sobolev spaces
p. 722-723
Estimates for solutions of quasilinear systems of parabolic type
p. 723-726
On a problem of Florio and Seibert
p. 727-729
Fractional powers of quasidifferential operators and theorems on the property of being a basis
p. 729-731