On the Directions of Segments and r-Dimensional Balls on a Convex Surface
<jats:p> We prove that the set of directions of <jats:inline-formula> <jats:alternatives> <jats:tex-math notation="LaTeX">(n-2)</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">...