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Contents of issues 2020 / 97 / 1-2:

2020 / 97 / 1-2 (1) - DOI: 10.5486/PMD.2020.8619 - p. 1-25
Ioana-Claudia Lazăr: The collapsibility of CAT(0) square $2$-complexes
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2020 / 97 / 1-2 (2) - DOI: 10.5486/PMD.2020.8630 - p. 27-39
Zsolt Balogh and Victor Bovdi: The isomorphism problem of unitary subgroups of modular group algebras
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2020 / 97 / 1-2 (3) - DOI: 10.5486/PMD.2020.8693 - p. 41-61
Bingyang Hu and Songxiao Li: $\mathcal{N}(p,q,s)$-type spaces in the unit ball of $\mathbb{C}^n$. III. Various characterizations
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2020 / 97 / 1-2 (4) - DOI: 10.5486/PMD.2020.8697 - p. 63-76
Enrique González-Jiménez: Torsion growth over cubic fields of rational elliptic curves with complex multiplication
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2020 / 97 / 1-2 (5) - DOI: 10.5486/PMD.2020.8699 - p. 77-84
María Angeles Moreno-Frías and José Carlos Rosales: Perfect numerical semigroups with embedding dimension three
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2020 / 97 / 1-2 (6) - DOI: 10.5486/PMD.2020.8702 - p. 85-99
Dhriti Sundar Patra, Amalendu Ghosh and Arindam Bhattacharyya: The critical point equation on Kenmotsu and almost Kenmotsu manifolds
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2020 / 97 / 1-2 (7) - DOI: 10.5486/PMD.2020.8725 - p. 101-115
Adel Alahmadi, Alaa Altassan, Florian Luca and Hatoon Shoaib: Products of $k$-Fibonacci numbers which are rep-digits
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2020 / 97 / 1-2 (8) - DOI: 10.5486/PMD.2020.8739 - p. 117-147
Petr Hasil, Jaroslav Jaroš and Michal Veselý: Riccati technique and oscillation constant for modified Euler type half-linear equations
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2020 / 97 / 1-2 (9) - DOI: 10.5486/PMD.2020.8765 - p. 149-160
Xiaosheng Li, Huibin Chen and Zhiqi Chen: Einstein--Randers metrics on compact simple Lie groups
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2020 / 97 / 1-2 (10) - DOI: 10.5486/PMD.2020.8768 - p. 161-180
Liuquan Wang: New congruences on multiple harmonic sums and Bernoulli numbers
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2020 / 97 / 1-2 (11) - DOI: 10.5486/PMD.2020.8793 - p. 181-199
Li Yin, Xiu-Li Lin and Feng Qi: Monotonicity, convexity and inequalities related to complete $(p,q,r)$-elliptic integrals and generalized trigonometric functions
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2020 / 97 / 1-2 (12) - DOI: 10.5486/PMD.2020.8801 - p. 201-216
Bin Zhang: The flatness of a class of ternary cyclotomic polynomials
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2020 / 97 / 1-2 (13) - DOI: 10.5486/PMD.2020.8810 - p. 217-239
Guy Roger Biyogmam, José Manuel Casas and Natália Pacheco Rego: Lie-central derivations, Lie-centroids and Lie-stem Leibniz algebras
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2020 / 97 / 1-2 (14) - DOI: 10.5486/PMD.2020.8818 - p. 241-252
Ágota Figula and Péter T. Nagy: Tangent prolongation of $\mathcal{C}^r$-differentiable loops
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2020 / 97 / 1-2 (15) - DOI: 10.5486/PMD.2020.8876 - p. 253-264
Hesam Safa, Homayoon Arabyani and Morteza Norouzi: On the $c$-nilpotent multiplier of a pair of Lie algebras
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