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We obtain a refinement of a selection principle for $(, \lambda)(s)$ sequences in Banach spaces due to Rosenthal. This result is then used to show that if is a bounded, non-weakly compact, closed convex subset of a Banach space , then there exists a Hausdorff vector topology on which is weaker than the weak topology, a closed, convex -compact subset of and an affine bi-Lipschitz map without fixed points.

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