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

Online First articles

• Countably compact inverse semigroups and Nyikos’ problem Serhii Bardyla Fundamenta Mathematicae MSC: Primary 20M18; Secondary 22A15, 22A26, 54D30 DOI: 10.4064/fm250509-11-8 Published online: 10 January 2026
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• On the determinant of checkerboard colorable virtual knots Tomoaki Hatano, Yuta Nozaki Fundamenta Mathematicae MSC: Primary 57K12; Secondary 57K10, 57K16 DOI: 10.4064/fm240809-4-1 Published online: 29 January 2026
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• Forking and invariant measures in NIP theories Anand Pillay, Atticus Stonestrom Fundamenta Mathematicae MSC: Primary 03C45; Secondary 37B05 DOI: 10.4064/fm250109-17-11 Published online: 11 February 2026
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• Products of pseudofinite structures Paola D’Aquino, Angus J. Macintyre Fundamenta Mathematicae MSC: Primary 03C20; Secondary 03C52 DOI: 10.4064/fm250715-28-12 Published online: 9 March 2026
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• Ultrafilters over uncountable cardinals and the Tukey order Tom Benhamou, Justin Tatch Moore, Luke Serafin Fundamenta Mathematicae MSC: Isbell’s problem, Rudin–Keisler order, Tukey order, Tukey-top, ultrafilter DOI: 10.4064/fm250916-29-1 Published online: 20 March 2026
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