4-Jun-1995
## Unsolved Problem 23:

##
How should you locate 13 cities on a spherical planet
so that the minimum distance between any two of them is
as large as possible?

## Reference:

- [Meschkowski 1966]
- Herbert Meschkowski,
Unsolved and Unsolvable Problems in Geometry.
Frederick Ungar Publishing Co. New York: 1966.
Page 1.

Thirteen Points on a Sphere

Each week, for your edification, we publish a well-known
unsolved mathematics problem. These postings are intended
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are investigating. We do not suggest that you tackle these problems,
since mathematicians have been unsuccessfully working on these
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