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Online First articles

• An optimal estimate for martingale transforms Barbara Bugała Colloquium Mathematicum MSC: Primary 60G42; Secondary 60G46 DOI: 10.4064/cm9708-4-2026 Published online: 11 June 2026
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• Non-Hausdorff $T_1$ properties Steven Clontz Colloquium Mathematicum MSC: Primary 54D10 DOI: 10.4064/cm9556-4-2026 Published online: 11 June 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 MSC: Primary 37C25; Secondary 37C30, 20E45, 55M20 DOI: 10.4064/cm9590-12-2025 Published online: 14 July 2026
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• Widths of regular components for an $n$-regular tree $T(n)$ Jie Liu Colloquium Mathematicum MSC: Primary 16G20; Secondary 16G70 DOI: 10.4064/cm9392-6-2026 Published online: 29 July 2026
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