Instytut Matematyczny Polskiej Akademii Nauk / Institute of Mathematics / Publishing house / Journals and Serials / Fundamenta Mathematicae

Online First articles

• Tree properties at successors of singulars of many cofinalities William Adkisson Fundamenta Mathematicae MSC: Primary 03E05; Secondary 03E55 DOI: 10.4064/fm250219-2-3 Published online: 7 May 2026
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• Measurable Brooks’s theorem for directed graphs Cecelia Higgins Fundamenta Mathematicae MSC: Primary 03E15; Secondary 05C15, 05C20 DOI: 10.4064/fm241107-7-4 Published online: 14 May 2026
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• The breadth of constructibility degrees and definable Sierpiński’s coverings Alessandro Andretta, Lorenzo Notaro Fundamenta Mathematicae MSC: Primary 03E15; Secondary 03E45 DOI: 10.4064/fm240819-27-11 Published online: 20 May 2026
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• Return time sets and product recurrence Jian Li, Xianjuan Liang, Yini Yang Fundamenta Mathematicae MSC: Primary 37B20; Secondary 37B05 DOI: 10.4064/fm241006-2-1 Published online: 27 May 2026
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• Critical ideals for countable compact spaces Rafał Filipów, Małgorzata Kowalczuk, Adam Kwela Fundamenta Mathematicae MSC: Primary 54A20; Secondary 03E05, 03E10, 03E15, 03E17, 03E75, 40A05, 54H05 DOI: 10.4064/fm250316-25-1 Published online: 8 June 2026
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• The descriptive complexity of the set of arc-connected compact subsets of the plane Gabriel Debs, Jean Saint Raymond Fundamenta Mathematicae MSC: Primary 54H05; Secondary 03E15 DOI: 10.4064/fm241114-10-4 Published online: 8 June 2026
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• Minimal Banach–Tarski decompositions Cesare Straffelini, Kilian Zambanini Fundamenta Mathematicae MSC: Primary 03E25; Secondary 20E05, 28A05 DOI: 10.4064/fm250713-19-2 Published online: 8 June 2026
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