On the Stepanov-almost periodic solution of a second-order operator differential equation
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Suppose X is a Banach space and J is the interval −∞ t p is said to be Stepanov-bounded or S p -bounded on J if (for the definitions of almost periodicity and S p -almost periodicity, see Amerio-Prouse ( 1 , pp. 3 and 77).
[1] Luigi Amerio,et al. Almost-periodic functions and functional equations , 1971 .