Periodic solutions for second order differential systems with damping
On forced periodic oscillations in dissipative Liénard systems
Example of a convergence commutative group which is not separated
On the Existence and Uniqueness of Periodic Solutions of Differential Delay Equations.
On a question of Josef Novák about convergence spaces
Periodic solutions of Liénard equations
Relatively coarse sequential convergence
We generalize the notion of a coarse sequential convergence compatible with an algebraic structure to a coarse one in a given class of convergences. In particular, we investigate coarseness in the class of all compatible convergences (with unique limits) the restriction of which to a given subset is fixed. We characterize such convergences and study relative coarseness in connection with extensions and completions of groups and rings. E.g., we show that: (i) each relatively coarse dense group precompletion...
A coarse convergence group need not be precompact
Fine convergence in free groups
Coarse sequential convergence in groups, etc
Periodic solutions to second order differential equations of Liénard type with jumping nonlinearities
Strict completions of -groups
On convergence groups with dense coarse subgroups
An elliptic problem with arbitrarily small positive solutions.
Fixed points, periodic points, and coin-tossing sequences for mappings defined on two-dimensional cells.
Periodic points and chaotic-like dynamics of planar maps associated to nonlinear Hill's equations with indefinite weight.
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