RT info:eu-repo/semantics/article T1 Optimal flat functions in Carleman–Roumieu ultraholomorphic classes in sectors A1 Jiménez Garrido, Javier A1 Miguel Cantero, Ignacio A1 Sanz Gil, Javier A1 Schindl, Gerhard K1 Carleman–Roumieu ultraholomorphic classes K1 Asymptotic expansions K1 Linear extension operators K1 12 Matemáticas AB We construct optimal flat functions in Carleman–Roumieu ultraholomorphic classes associated to general strongly nonquasianalytic weight sequences, and defined on sectors of suitably restricted opening. A general procedure is presented in order to obtain linear continuous extension operators, right inverses of the Borel map, for the case of regular weight sequences in the sense of Dyn’kin. Finally, we discuss some examples (including the well-known q-Gevrey case) where such optimal flat functions can be obtained in a more explicit way. PB Springer SN 1422-6383 YR 2023 FD 2023 LK https://uvadoc.uva.es/handle/10324/59000 UL https://uvadoc.uva.es/handle/10324/59000 LA eng NO Results in Mathematics, 2023, vol. 78, n. 3, art. 98. NO Producción Científica DS UVaDOC RD 24-nov-2024