Meichsner, JanJanMeichsnerSeifert, ChristianChristianSeifert2020-02-122020-02-122019-11-18PAMM 19 (1): e201900298 (2019)http://hdl.handle.net/11420/4887We show to what extend fractional powers of non‐densely defined sectorial operators on Banach spaces can still be described by the harmonic extension approach.en1617-7061Proceedings in applied mathematics and mechanics20191Wiley-VCHhttps://creativecommons.org/licenses/by/4.0/PDEbanachlaplacianMathematikA Note on the Harmonic Extension Approach to Fractional Powers of non‐densely defined OperatorsConference Paper10.15480/882.265410.1002/pamm.20190029610.15480/882.2654Conference Paper