Abstract: We explain how the theorem of Banach discussed in [Ne97] can be generalized to target spaces which are not necessarily path connected. Moreover, we correct errors in the literature concerning the classification of separable unitary representations for the Banach Lie group {$U(H)$} [Pi88, Pi90].}
{\eightrm [Ne97] Neeb, K.-H., {\eightit On a Theorem of S. Banach}, Journal of Lie Theory 7 (1997), 293-300.
[Pi88] Pickrell, D., \eightit The Separable Representations of \eightrm U$(\cal H)$, Proc. Amer. Math. Soc. 102 (1988), 416-420. \smallskip
[Pi90] - , {\eightit Separable Representations for Automorphism Groups of Infinite Symmetric Spaces}, J. Funct. Anal. 90 (1990), 1-26.
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