1. Nonlinear singular problems with indefinite potential term
Nikolaos Papageorgiou, Vicenţiu Rǎdulescu, Dušan Repovš, 2019, original scientific article

Keywords: nonhomogeneous differential operator, indefinite potential, singular term, concave and convex nonlinearities, truncation, comparison principles, nonlinear regularity, nonlinear maximum principle
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3. Toždestva v algebrah i kombinatornye svojstva dvoičnyh slov
Mikhail Zaicev, Dušan Repovš, 2019, short scientific article

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5. On existence of PI-exponents of unital algebras
Dušan Repovš, Mikhail Zaicev, 2020, original scientific article

Keywords: polynomial identities, exponential codimension growth, PI-exponent, unital algebra, numerical invariant
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7. Superlinear perturbations of the eigenvalue problem for the Robin Laplacian plus an indefinite and unbounded potential
Nikolaos Papageorgiou, Vicenţiu Rǎdulescu, Dušan Repovš, 2020, original scientific article

Keywords: superlinear perturbation, regularity theory, maximum principle, constant sign and nodal solutions, critical groups, indefinite potential
Full text (file, 661,09 KB)

9. Nonlinear nonhomogeneous Robin problems with almost critical and partially concave reaction
Nikolaos Papageorgiou, Dušan Repovš, Calogero Vetro, 2020, original scientific article

Keywords: competition phenomena, nonlinear regularity, nonlinear maximum principle, strong comparison principle, bifurcation-type result, almost critical growth
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