# Differential Equations | 2001(37) articles

- Bifurcation of an Equilibrium for a System of Differential Equations in the Critical Case of Two Pure Imaginary and Two Zero Roots of the Characteristic Equation : II
- A Critical Periodic Boundary Value Problem for a Matrix Riccati Equation
- Reducibility of Single-Input Linear Piecewise Smooth Systems to Hessenberg and Frobenius Forms
- A Parameter Extension Method for Solving Boundary Value Problems in Optimal Control Theory
- Remarks on Guiding Functions and Periodic Solutions
- Nonanticipating Multimappings and Their Construction by the Method of Program Iterations : I
- A Special Dulac Function for a Quadratic System on the Plane
- The Green Matrix for Strictly Hyperbolic Systems with Second-Order Derivatives
- A Two-Dimensional Step-Like Contrast Structure in the Case of a Multiple Root of the Transition Line Equation
- Criticality for Some Evolution Equations
- Critical Exponents for the Absence of Solutions for Systems of Quasilinear Parabolic Inequalities
- A Generalization of a Fundamental System of Functions of the Laplace Operator
- Periodic Solutions of a System of Linear Difference Equations with Continuous Argument
- A Two-SidedMethod for the First Boundary Value Problem for Singular Ordinary Differential Equations
- A Class of Singularly Perturbed Boundary Value Problems with Unstable Spectrum of the Limit Operator
- Conditions for Convergence of Biorthogonal Expansions of Functions on a Closed Interval
- Periodic Solutions of Nonlinear Nonautonomous Systems of Ordinary Differential Equations
- The Dirichlet Problem for a Degenerate Hyperbolic Equation in a Rectangle