Abstract
A method to construct an equivalent norm with both a rotundity and a smoothness property in a Banach space having two different equivalent norms, one with the rotundity and one with the smoothness property.
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Asplund, E. Averaged norms. Israel J. Math. 5, 227–233 (1967). https://doi.org/10.1007/BF02771611
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DOI: https://doi.org/10.1007/BF02771611