A note on Hornich's problem
- Cite this article as:
- Zong, C. Arch. Math. (1999) 72: 127. doi:10.1007/s000130050313
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This note, by applying Dirichlet's approximation theorem, achieves an upper bound for Hornich's problem, the problem to determine the smallest number of nonoverlapping unit spheres which can block all the light rays starting from the center of a fixed one.