Brandenbursky, MichaelKedra, Jarek2022-10-212022-10-212022-06-22Brandenbursky, M & Kedra, J 2022, 'Fragmentation norm and relative quasimorphisms', Proceedings of the American Mathematical Society, vol. 150, pp. 4519-4531. https://doi.org/10.1090/proc/146830002-9939ORCID: /0000-0002-1599-2482/work/161798333https://hdl.handle.net/2164/19416Acknowledgments. We would like to thank Lev Buhovsky, Yaron Ostrover and Leonid Polterovich for helpful discussions. We would like to thank the referees for a thorough reading of our paper and for very useful suggestions. We thank the Center for Advanced Studies in Mathematics at Ben Gurion University for supporting the visit of the second author at BGU. This work was funded by a Leverhulme Trust Research Project Grant RPG-2017-159.13223791engmeasure-preserving homeomorphismsHamiltonian diffeomorphismsfragmentation normrelative quasimorphismsQA MathematicsOtherRPG-2017-159QAJournal article10.1090/proc/14683https://arxiv.org/abs/1804.06592https://www.ams.org/journals/proc/2022-150-10/S0002-9939-2022-14683-8/home.html150