Cobos, FernandoFernández-Martínez, Pedro2023-06-202023-06-2019920039-3223https://hdl.handle.net/20.500.14352/57280We prove a reiteration theorem for interpolation methods defined by means of polygons, and a Wolff theorem for the case when the polygon has 3 or 4 vertices. In particular, we establish a Wolff theorem for Fernandez' spaces, which settles a problem left over in [5].engjournal articlehttp://matwbn.icm.edu.pl/ksiazki/sm/sm102/sm10235.pdfhttp://www.impan.pl/restricted access519.6Reiteration theoreminterpolationmeans of polygonsWolff theoremFernandez’ spacesAnálisis numérico1206 Análisis Numérico