On the topological structure of the solution set for a semilinear ffunctional-differential inclusion in a Banach space

Volume 35 / 1996

Giuseppe Conti, Valeri Obukhovskiĭ, Pietro Zecca Banach Center Publications 35 (1996), 159-169 DOI: 10.4064/-35-1-159-169


In this paper we show that the set of all mild solutions of the Cauchy problem for a functional-differential inclusion in a separable Banach space E of the form x'(t) ∈ A(t)x(t) + F(t,x_t) is an $R_δ$-set. Here {A(t)} is a family of linear operators and F is a Carathéodory type multifunction. We use the existence result proved by V. V. Obukhovskiĭ [22] and extend theorems on the structure of solutions sets obtained by N. S. Papageorgiou [23] and Ya. I. Umanskiĭ [32].


  • Giuseppe Conti
  • Valeri Obukhovskiĭ
  • Pietro Zecca

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