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Abstract Let C be a proper, closed subset with nonempty interior in a normed space X. We define four variants of modulus of convexity for C and prove that they all coincide. This result, which is classical and well-known for C=BX C = B X (the unit ball of X), requires a less easy proof than the particular case of BX. B X. We also show that if the modulus of convexity of C is not identically null, then C is bounded. This extends a result by M. V. Balashov and D. Repovš.
Bernardi et al. (Sat,) studied this question.
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