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Contents of issues 2021 / 98 / 1-2:

2021 / 98 / 1-2 (1) - DOI: 10.5486/PMD.2021.8731 - p. 1-14
Man Chen and Tianfang Qi: A Menon--Sury-type identity for arithmetic functions on $\mathbb{F}_q[T]$
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2021 / 98 / 1-2 (2) - DOI: 10.5486/PMD.2021.8746 - p. 15-42
Eero Harmaala and Riku Klén: Ptolemy constant and uniformity
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2021 / 98 / 1-2 (3) - DOI: 10.5486/PMD.2021.8757_1 - p. 43-63
Ilya Amburg and Thomas Garrity: Functional analysis behind a family of multidimensional continued fractions. Part I
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2021 / 98 / 1-2 (4) - DOI: 10.5486/PMD.2021.8758 - p. 65-81
Dávid Bóka, Péter Burcsi and M. János Uray: On the algorithmic complexity of some numeration-related problems
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2021 / 98 / 1-2 (5) - DOI: 10.5486/PMD.2021.8791 - p. 83-113
Rongmin Zhu, Yeyang Peng and Nanqing Ding: Recollements associated to cotorsion pairs over upper triangular matrix rings
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2021 / 98 / 1-2 (6) - DOI: 10.5486/PMD.2021.8820 - p. 115-127
Marian Vâjâitu: On Lebesgue decomposition of $p$-adic distributions
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2021 / 98 / 1-2 (7) - DOI: 10.5486/PMD.2021.8822 - p. 129-155
Yi Cai and Vilmos Komornik: Difference of Cantor sets and frequencies in Thue--Morse type sequences
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2021 / 98 / 1-2 (8) - DOI: 10.5486/PMD.2021.8833 - p. 157-181
Ingrid Vukusic and Volker Ziegler: On sums of Fibonacci numbers with few binary digits
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2021 / 98 / 1-2 (9) - DOI: 10.5486/PMD.2021.8834 - p. 183-199
Mohammad Farrokhi D. G. and Ali Azimi: Factorization graphs of finite groups
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2021 / 98 / 1-2 (10) - DOI: 10.5486/PMD.2021.8842 - p. 201-218
Tsiu-Kwen Lee and Jheng-Huei Lin: Outer inverses, minus partial orders, and triplet invariance
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2021 / 98 / 1-2 (11) - DOI: 10.5486/PMD.2021.8854 - p. 219-230
Jean-Marie De Koninck, Imre Kátai and Bui Minh Phong: On the variations of completely multiplicative functions at consecutive arguments
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2021 / 98 / 1-2 (12) - DOI: 10.5486/PMD.2021.8865 - p. 231-242
Yongbeom Kim, Tuo Yeong Lee, Vengat S., Hui Xiang Sim and Jay Kin Heng Tai: A sharp trigonometric double inequality
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2021 / 98 / 1-2 (13) - DOI: 10.5486/PMD.2021.8871 - p. 243-253
Jhon J. Bravo, Maribel Díaz and José L. Ramírez: On a variant of the Brocard--Ramanujan equation and an application
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2021 / 98 / 1-2 (14) - DOI: 10.5486/PMD.2021.8977 - p. 255-258
Xiaoyou Chen and Ni Du: A note on monolithic Brauer characters
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