{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,1]],"date-time":"2026-07-01T08:39:10Z","timestamp":1782895150246,"version":"3.54.5"},"reference-count":50,"publisher":"Society for Industrial & Applied Mathematics (SIAM)","issue":"4","funder":[{"DOI":"10.13039\/100009112","name":"INdAM","doi-asserted-by":"crossref","id":[{"id":"10.13039\/100009112","id-type":"DOI","asserted-by":"crossref"}]},{"name":"JUNIPER"},{"name":"Italian Ministry of University and Research","award":["2020JLWP23"],"award-info":[{"award-number":["2020JLWP23"]}]},{"name":"CUP","award":["G25F22000430006"],"award-info":[{"award-number":["G25F22000430006"]}]},{"name":"INF-ACT"},{"name":"BEHAVE-MOD","award":["PE00000007 \u2013 CUP I83C22001810007"],"award-info":[{"award-number":["PE00000007 \u2013 CUP I83C22001810007"]}]},{"DOI":"10.13039\/501100000266","name":"Engineering and Physical Sciences Research Council","doi-asserted-by":"publisher","award":["UKRI170"],"award-info":[{"award-number":["UKRI170"]}],"id":[{"id":"10.13039\/501100000266","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["SIAM J. Numer. Anal."],"published-print":{"date-parts":[[2026,8,31]]},"abstract":"<jats:p>Abstract.<\/jats:p>\n                  <jats:p>We rigorously investigate the convergence of a new numerical method, recently proposed by the authors, to approximate the reproduction numbers of a large class of age-structured population models with finite age span. The method consists in reformulating the problem in a space of absolutely continuous functions via an integral mapping. For any chosen splitting into birth and transition processes, we first define an operator that maps a generation to the next one (corresponding to the next generation operator in the case of [Formula: see text]). Then, we approximate the infinite-dimensional operator with a matrix using pseudospectral discretization. In this paper, we prove that the spectral radius of the resulting matrix converges to the true reproduction number, and the (interpolation of the) corresponding eigenvector converges to the associated eigenfunction, with convergence order that depends on the regularity of the model coefficients. Results are confirmed experimentally and applications to epidemiology are discussed.<\/jats:p>","DOI":"10.1137\/24m1687224","type":"journal-article","created":{"date-parts":[[2026,7,1]],"date-time":"2026-07-01T07:21:49Z","timestamp":1782890509000},"page":"1073-1094","source":"Crossref","is-referenced-by-count":0,"title":["On the Convergence of the Pseudospectral Approximation of Reproduction Numbers for Age-Structured Models"],"prefix":"10.1137","volume":"64","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1988-2133","authenticated-orcid":true,"given":"Simone","family":"De Reggi","sequence":"first","affiliation":[{"name":"Department of Mathematics, University of Trento, Italy; and CDLab - Computational Dynamics Laboratory, Department of Mathematics, Computer Science and Physics, University of Udine, Italy."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0250-4555","authenticated-orcid":true,"given":"Francesca","family":"Scarabel","sequence":"additional","affiliation":[{"name":"School of Mathematics, University of Leeds, United Kingdom; and CDLab - Computational Dynamics Laboratory, Department of Mathematics, Computer Science and Physics, University of Udine, Italy."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7960-1487","authenticated-orcid":true,"given":"Rossana","family":"Vermiglio","sequence":"additional","affiliation":[{"name":"CDLab - Computational Dynamics Laboratory, Department of Mathematics, Computer Science and Physics, University of Udine, Italy."}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"351","published-online":{"date-parts":[[2026,7,1]]},"reference":[{"key":"ref1","doi-asserted-by":"publisher","DOI":"10.1017\/S0022172400066079"},{"key":"ref2","doi-asserted-by":"publisher","DOI":"10.1017\/S002217240006160X"},{"key":"ref3","doi-asserted-by":"publisher","DOI":"10.1002\/mma.4673"},{"key":"ref4","volume-title":"Chebyshev and Fourier Spectral Methods","author":"Boyd J. 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