Abstract
We consider Fourier series of functions in L p(0, 2π; X) where X is a Banach space. In particular, we show that the Fourier series of each function in L p(0, 2π; X) converges unconditionally if and only if p=2 and X is a Hilbert space. For operator-valued multipliers we present the Marcinkiewicz theorem and give applications to differential equations. In particular, we characterize maximal regularity (in a slightly different version than the usual one) by R-sectoriality. Applications to non-autonomous problems are indicated.
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Arendt, W., Bu, S. (2009). Fourier Series in Banach spaces and Maximal Regularity. In: Curbera, G.P., Mockenhaupt, G., Ricker, W.J. (eds) Vector Measures, Integration and Related Topics. Operator Theory: Advances and Applications, vol 201. Birkhäuser Basel. https://doi.org/10.1007/978-3-0346-0211-2_2
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DOI: https://doi.org/10.1007/978-3-0346-0211-2_2
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