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Bulletin, Classe des Sciences Mathématiques et Naturelles, Sciences mathématiquesPublisher: Srpska akademija nauka i umetnosti, BeogradISSN: 0561-7332Issue: 45Date: 2020 Editorial BoardImpressum   On hypercyclicity and supercyclicity of strongly continuous semigroups induced by semiflows. Disjoint hypercyclic semigroups 1 - 24 Marko Kostić   AbstractKeywords: hypercyclic semigroups; disjoint hypercyclic semigroups; supercyclic semigroups; semiflowsMSC: 37D45; 47D03; 47D06; 47A16 Bounded linear and compact operators between the Hahn space and spaces of strongly summable and bounded sequences 25 - 41 Eberhard Malkowsky, Vladimir Rakočević and Vesna Veličković   AbstractKeywords: the Hahn sequence space; spaces of strongly summable and sequences; bounded bounded linear operators; Hausdorff measure of noncompactness; compact operatorsMSC: 46A45; 40C05; 46B45; 47H08 Sombor index - one year later 43 - 55 Ivan Gutman   AbstractKeywords: Sombor index; degree (of vertex); chemical graph theoryMSC: 05C07; 05C09; 05C92 A note on sharpening of the Erdős-Lax inequality concerning polynomials 57 - 66 Gradimir V. Milovanović, Abdullah Mir, Adil Hussain and Abrar Ahmad   AbstractKeywords: Bernstein-type inequalities; Extremal coefficients; Erdős-Lax inequalityMSC: 30A10; 30C10; 30C15 The Ahlfors-Schwarz lemma, curvature, distance and distortion 67 - 119 Miodrag Mateljević   AbstractKeywords: hyperbolic metric; ultrahyperbolic metric; harmonic quasiregular maps; negatively curved metricsMSC: 30F45; 32G15

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