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Contents of Volume 181

• Non-Hausdorff $T_1$ properties Steven Clontz Colloquium Mathematicum 181 (2026), 1-16 MSC: Primary 54D10 DOI: 10.4064/cm9556-4-2026
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• An optimal estimate for martingale transforms Barbara Bugała Colloquium Mathematicum 181 (2026), 17-40 MSC: Primary 60G42; Secondary 60G46 DOI: 10.4064/cm9708-4-2026
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• The Reidemeister zeta functions and the Gauss congruences for the Reidemeister numbers Malwina Bondarewicz, Wojciech Bondarewicz, Alexander Fel’shtyn Colloquium Mathematicum 181 (2026), 41-61 MSC: Primary 37C25; Secondary 37C30, 20E45, 55M20 DOI: 10.4064/cm9590-12-2025
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• Constructions of Rota–Baxter operators by L-R smash products Daowei Lu, Dingguo Wang Colloquium Mathematicum 181 (2026), 63-83 MSC: Primary 16T05; Secondary 17B38 DOI: 10.4064/cm9730-3-2026
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• On zero-sum subsequences over finite abelian groups of length not exceeding a given number Kevin Zhao, Siao Hong Colloquium Mathematicum 181 (2026), 85-115 MSC: Primary 11B75; Secondary 11R27 DOI: 10.4064/cm9599-7-2026
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• Hopf algebra structures on free unitary extended Rota–Baxter algebras Xiaojiao Zhou, Huizhen Qiu Colloquium Mathematicum 181 (2026), 117-137 MSC: Primary 16W99; Secondary 17B38 DOI: 10.4064/cm9795-2-2026
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• Widths of regular components for an $n$-regular tree $T(n)$ Jie Liu Colloquium Mathematicum 181 (2026), 139-150 MSC: Primary 16G20; Secondary 16G70 DOI: 10.4064/cm9392-6-2026
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• Quiver Grassmannians associated to nilpotent cyclic representations defined by a single matrix Mateusz Lowiel Colloquium Mathematicum 181 (2026), 151-174 MSC: Primary 16G20; Secondary 14M15 DOI: 10.4064/cm9706-4-2026
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• Constructions of symmetrical separable equivalences and their applications Juxiang Sun, Guoqiang Zhao Colloquium Mathematicum 181 (2026), 175-195 MSC: Primary 16G10; Secondary 16E10 DOI: 10.4064/cm9716-4-2026
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• Universal mappings with fixed range in $\mathbb R^n$ Dimitrios Georgiou, Athanasios Megaritis, Fotini Sereti Colloquium Mathematicum 181 (2026), 197-208 MSC: Primary 54B99; Secondary 54C05, 54C10, 54C25 DOI: 10.4064/cm9604-10-2025
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• Construction of ideal cotorsion pairs via recollements of triangulated categories Qikai Wang, Haiyan Zhu Colloquium Mathematicum 181 (2026), 209-226 MSC: Primary 18G15; Secondary 18G80, 16E30 DOI: 10.4064/cm9723-4-2026
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• The thermodynamic approach to multifractal analysis for weighted topological entropy Yuchen Dai, Cao Zhao, Lei Liu Colloquium Mathematicum 181 (2026), 227-247 MSC: Primary 37B05; Secondary 37C45, 37C85, 37D35, 54F45 DOI: 10.4064/cm9755-5-2026
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• On Euclidean algorithms for oriented linear Grassmannians Maxim Arnold, Oleg Karpenkov Colloquium Mathematicum 181 (2026), 249-266 MSC: Primary 11J70; Secondary 11A05, 15A21 DOI: 10.4064/cm9726-4-2026
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• Remark on an overdetermined problem for the $p$-harmonic equation in annular domains Xuyan Su, Jiabin Yin Colloquium Mathematicum 181 (2026), 267-276 MSC: Primary 35J25; Secondary 35A23, 31B15 DOI: 10.4064/cm9732-2-2026
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