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On the Hyers-Ulam stability of the Banach space-valued differential equation y' = lambda y

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Abstract

Let I be an open interval and X a complex Banach space.Let varepsilon geq 0 and lambda a non-zero complexnumber with text{rm Re},lambda neq 0. If varphi is astrongly differentiable map from I to X with Vertvarphi'(t)-lambda varphi(t) Vert leq varepsilon for allt in I, then we show that the distance between varphi and the set ofall solutions to the differential equation y' = lambda y is at mostvarepsilon/ vert text{rm Re},lambda vert.

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