Pub Date : 2024-04-03DOI: 10.1007/s43670-024-00084-y
Wedad Alharbi, Salah Alshabhi, Daniel Freeman, Dorsa Ghoreishi
{"title":"Locality and stability for phase retrieval","authors":"Wedad Alharbi, Salah Alshabhi, Daniel Freeman, Dorsa Ghoreishi","doi":"10.1007/s43670-024-00084-y","DOIUrl":"https://doi.org/10.1007/s43670-024-00084-y","url":null,"abstract":"","PeriodicalId":74751,"journal":{"name":"Sampling theory, signal processing, and data analysis","volume":"263 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140750233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-01DOI: 10.1007/s43670-024-00082-0
M. Nasri
{"title":"Nonlinear expansions in Banach spaces","authors":"M. Nasri","doi":"10.1007/s43670-024-00082-0","DOIUrl":"https://doi.org/10.1007/s43670-024-00082-0","url":null,"abstract":"","PeriodicalId":74751,"journal":{"name":"Sampling theory, signal processing, and data analysis","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140086184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-23DOI: 10.1007/s43670-023-00081-7
A. Kivinukk, G. Tamberg
{"title":"A note on the cosine operator function for Mellin sampling series","authors":"A. Kivinukk, G. Tamberg","doi":"10.1007/s43670-023-00081-7","DOIUrl":"https://doi.org/10.1007/s43670-023-00081-7","url":null,"abstract":"","PeriodicalId":74751,"journal":{"name":"Sampling theory, signal processing, and data analysis","volume":"119 51","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139605364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-06DOI: 10.1007/s43670-023-00080-8
Paul L. Butzer Professor, Franz Pichler Professor, Ferenc Schipp Professor, Radomir S. Stanković Professor, Rudolf L. Stens Professor
{"title":"2023—A twofold commemoration: the 100th birthday of Walsh functions and the 50th anniversary of Professor Joseph Leonard Walsh’s death","authors":"Paul L. Butzer Professor, Franz Pichler Professor, Ferenc Schipp Professor, Radomir S. Stanković Professor, Rudolf L. Stens Professor","doi":"10.1007/s43670-023-00080-8","DOIUrl":"https://doi.org/10.1007/s43670-023-00080-8","url":null,"abstract":"","PeriodicalId":74751,"journal":{"name":"Sampling theory, signal processing, and data analysis","volume":"2 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139380626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-01Epub Date: 2023-12-04DOI: 10.1007/s43670-023-00073-7
Gergely Kiss, Dávid Matolcsi, Máté Matolcsi, Gábor Somlai
We discuss the relation of tiling, weak tiling and spectral sets in finite abelian groups. In particular, in elementary p-groups , we introduce an averaging procedure that leads to a natural object of study: a 4-tuple of functions which can be regarded as a common generalization of tiles and spectral sets. We characterize such 4-tuples for , and prove some partial results for .
{"title":"<ArticleTitle xmlns:ns0=\"http://www.w3.org/1998/Math/MathML\">Tiling and weak tiling in <ns0:math><ns0:msup><ns0:mrow><ns0:mo>(</ns0:mo><ns0:msub><ns0:mi>Z</ns0:mi><ns0:mi>p</ns0:mi></ns0:msub><ns0:mo>)</ns0:mo></ns0:mrow><ns0:mi>d</ns0:mi></ns0:msup></ns0:math>.","authors":"Gergely Kiss, Dávid Matolcsi, Máté Matolcsi, Gábor Somlai","doi":"10.1007/s43670-023-00073-7","DOIUrl":"https://doi.org/10.1007/s43670-023-00073-7","url":null,"abstract":"<p><p>We discuss the relation of tiling, weak tiling and spectral sets in finite abelian groups. In particular, in elementary <i>p</i>-groups <math><msup><mrow><mo>(</mo><msub><mi>Z</mi><mi>p</mi></msub><mo>)</mo></mrow><mi>d</mi></msup></math>, we introduce an averaging procedure that leads to a natural object of study: a 4-tuple of functions which can be regarded as a common generalization of tiles and spectral sets. We characterize such 4-tuples for <math><mrow><mi>d</mi><mo>=</mo><mn>1</mn><mo>,</mo><mn>2</mn></mrow></math>, and prove some partial results for <math><mrow><mi>d</mi><mo>=</mo><mn>3</mn></mrow></math>.</p>","PeriodicalId":74751,"journal":{"name":"Sampling theory, signal processing, and data analysis","volume":"22 1","pages":"1"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10695897/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138500405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-01Epub Date: 2024-01-17DOI: 10.1007/s43670-023-00079-1
Rima Alaifari, Francesca Bartolucci, Stefan Steinerberger, Matthias Wellershoff
Gabor phase retrieval is the problem of reconstructing a signal from only the magnitudes of its Gabor transform. Previous findings suggest a possible link between unique solvability of the discrete problem (recovery from measurements on a lattice) and stability of the continuous problem (recovery from measurements on an open subset of ). In this paper, we close this gap by proving that such a link cannot be made. More precisely, we establish the existence of functions which break uniqueness from samples without affecting stability of the continuous problem. Furthermore, we prove the novel result that counterexamples to unique recovery from samples are dense in . Finally, we develop an intuitive argument on the connection between directions of instability in phase retrieval and certain Laplacian eigenfunctions associated to small eigenvalues.
{"title":"On the connection between uniqueness from samples and stability in Gabor phase retrieval.","authors":"Rima Alaifari, Francesca Bartolucci, Stefan Steinerberger, Matthias Wellershoff","doi":"10.1007/s43670-023-00079-1","DOIUrl":"https://doi.org/10.1007/s43670-023-00079-1","url":null,"abstract":"<p><p><i>Gabor phase retrieval</i> is the problem of reconstructing a signal from only the magnitudes of its Gabor transform. Previous findings suggest a possible link between unique solvability of the discrete problem (recovery from measurements on a lattice) and stability of the continuous problem (recovery from measurements on an open subset of <math><msup><mrow><mi>R</mi></mrow><mn>2</mn></msup></math>). In this paper, we close this gap by proving that such a link cannot be made. More precisely, we establish the existence of functions which break uniqueness from samples without affecting stability of the continuous problem. Furthermore, we prove the novel result that counterexamples to unique recovery from samples are <i>dense</i> in <math><mrow><msup><mi>L</mi><mn>2</mn></msup><mrow><mo>(</mo><mi>R</mi><mo>)</mo></mrow></mrow></math>. Finally, we develop an intuitive argument on the connection between directions of instability in phase retrieval and certain Laplacian eigenfunctions associated to small eigenvalues.</p>","PeriodicalId":74751,"journal":{"name":"Sampling theory, signal processing, and data analysis","volume":"22 1","pages":"6"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10794308/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139543536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-12-11DOI: 10.1007/s43670-023-00078-2
R. Malikiosis
{"title":"A linear programming approach to Fuglede’s conjecture in $$mathbb {Z}_p^3$$","authors":"R. Malikiosis","doi":"10.1007/s43670-023-00078-2","DOIUrl":"https://doi.org/10.1007/s43670-023-00078-2","url":null,"abstract":"","PeriodicalId":74751,"journal":{"name":"Sampling theory, signal processing, and data analysis","volume":"2 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138981177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-10DOI: 10.1007/s43670-023-00072-8
Dorin Ervin Dutkay, Palle E. T. Jorgensen
{"title":"The momentum operator on a union of intervals and the Fuglede conjecture","authors":"Dorin Ervin Dutkay, Palle E. T. Jorgensen","doi":"10.1007/s43670-023-00072-8","DOIUrl":"https://doi.org/10.1007/s43670-023-00072-8","url":null,"abstract":"","PeriodicalId":74751,"journal":{"name":"Sampling theory, signal processing, and data analysis","volume":"113 47","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135138252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-03DOI: 10.1007/s43670-023-00074-6
Palle E. T. Jorgensen
{"title":"Early influences, the Fuglede question, spectrum vs tiling, and connection to related work by John von Neumann, Irving Segal, Marshall Stone, and David Shale","authors":"Palle E. T. Jorgensen","doi":"10.1007/s43670-023-00074-6","DOIUrl":"https://doi.org/10.1007/s43670-023-00074-6","url":null,"abstract":"","PeriodicalId":74751,"journal":{"name":"Sampling theory, signal processing, and data analysis","volume":"13 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135868222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-25DOI: 10.1007/s43670-023-00071-9
Jiahui Cheng, Minshuo Chen, Hao Liu, Tuo Zhao, Wenjing Liao
{"title":"High dimensional binary classification under label shift: phase transition and regularization","authors":"Jiahui Cheng, Minshuo Chen, Hao Liu, Tuo Zhao, Wenjing Liao","doi":"10.1007/s43670-023-00071-9","DOIUrl":"https://doi.org/10.1007/s43670-023-00071-9","url":null,"abstract":"","PeriodicalId":74751,"journal":{"name":"Sampling theory, signal processing, and data analysis","volume":"32 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134974103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}