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The Ahlfors-Schwarz lemma, curvature, distance and distortion
(Beograd : Académie Serbe des sciences et des arts, 2020)
In this paper, we consider versions of the Ahlfors-Schwarz lemma related
to ultrahyperbolic metric, quasiconformal harmonic and holomorphic functions (including
several dimensions versions) and harmonic mappings. Our ...
On hypercyclicity and supercyclicity of strongly continuous semigroups induced by semiflows. Disjoint hypercyclic semigroups
(Beograd : Académie Serbe des sciences et des arts, 2020)
We enquire into the basic structural properties of positively supercyclic
strongly continuous semigroups induced by locally Lipschitz continuous semiflows in the setting of weighted Lp and C0-type spaces. We also introduce ...
Bounded linear and compact operators between the Hahn space and spaces of strongly summable and bounded sequences
(Beograd : Académie Serbe des sciences et des arts, 2020)
We establish the characterisations of the classes of bounded linear operators from the generalised Hahn sequence space hd, where d is an unbounded monotone
increasing sequence of positive real numbers, into the spaces ...
Sombor index – one year later
(Beograd : Académie Serbe des sciences et des arts, 2020)
The Sombor index (SO) is a vertex–degree–based graph invariant, invented
in the Summer of 2020, and made publicly available in early 2021. In less than one year, a
remarkable number (almost fifty) research papers on this ...
A note on sharpening of the Erdo˝s-Lax inequality concerning polynomials
(Beograd : Académie Serbe des sciences et des arts, 2020)
In this paper, we establish some upper bound estimates for the modulus of
the derivative of a polynomial on the unit disk while taking into account the placement of the
zeros and the extremal coefficients of the polynomial. ...