The sum of two plane convex $C^\infty$ sets is not always $C^5$.
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1990-06-01
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Boman, J. (1990). The sum of two plane convex $C^\infty$ sets is not always $C^5$. MATHEMATICA SCANDINAVICA, 66, 216–224. https://doi.org/10.7146/math.scand.a-12305
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