In this paper we consider the normal map of a closed plane curve as a vector field on the
cylinder. We interpret the critical points geometrically and study their Poincar\'{e} index …

We consider the equilibrium points of the electrostatic potential of three mutually repelling
point charges with Coulomb interaction placed at the vertices of a given triangle T. It is …

We study the critical points of Coulomb energy considered as a function on configuration
spaces associated with certain geometric constraints. Two settings of such kind are …

On Equilibrium Concyclic Configurations = ∑ , Page 1 377 ISSN 1064-5624, Doklady
Mathematics, 2018, Vol. 98, No. 1, pp. 377–381. © Pleiades Publishing, Ltd., 2018. Original …

We discuss various aspects of a general problem naturally arising in the framework of an
approach to inverse problems of electrostatics. In particular, we describe some …

We discuss a natural problem concerned with equilibrium configurations of Coulomb
potential of three positive point charges constrained to a system of nested circles in the …

We discuss equilibrium configurations of the Coulomb potential of positive point charges
with positions satisfying certain quadratic constraints in the plane and three-dimensional …

Ik herinner me nog de promotie van Henk op vrijdag 19 october 1979 in Groningen. Wellicht
was dat de eerste keer, dat ik hem ontmoette. Op dezelfde dag was er ook de promotie van …

Изучается задача характеризации кулоновских равновесных конфигураций на
окружности, отрезке и системе трёх концентрических окружностей. Получено …