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Published online by Cambridge University Press: 17 April 2009
The relative Schoenflies theorem says that a locally flat embedding e: Sn−1 → Rn for which e−1(Rk) = Sk−1 extends to homeomorphism of the pair (Rn, Rk) provided the local collars respect Rk. In this note it is shown that the proviso is essential, at least when k = 3.