The sum of two plane convex $C^\infty$ sets is not always $C^5$. (Q3981372)

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scientific article; zbMATH DE number 21756
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The sum of two plane convex $C^\infty$ sets is not always $C^5$.
scientific article; zbMATH DE number 21756

    Statements

    The sum of two plane convex $C^\infty$ sets is not always $C^5$. (English)
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    26 June 1992
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    sum of convex bodies
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    differentiability properties of convex bodies
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