We characterize the existence of periodic solutions for some abstract neutral functional fractional differential equations with finite delay when the underlying space is a UMD space.
K E Y W O R D SOperator-valued Fourier multipliers, -boundedness, periodic vector-valued Lebesgue spaces, neutral functional differential equations M S C ( 2 0 1 0 ) 34G10, 34K13, 35A02, 47D06