Robbins constant
From HandWiki
In geometry, the Robbins constant, named after David P. Robbins, is the average distance between two points selected at random within a unit cube. Robbins constant can be expressed as [1]
- [math]\displaystyle{ \frac{4+17\sqrt2-6\sqrt3-7\pi}{105} + \frac{\ln(1+\sqrt2)}{5} + \frac{2\ln(2+\sqrt3)}{5}. }[/math]
Its numerical value is approximately [2]
- [math]\displaystyle{ 0.66170718226717623515582. }[/math]
References
- ↑ Robbins, David P.; Bolis, Theodore S. (1978), "Average distance between two points in a box (solution to elementary problem E2629)", American Mathematical Monthly 85 (4): 277–278, doi:10.2307/2321177.
- ↑ Plouffe, Simon, "The Robbins constant", Miscellaneous Mathematical Constants, http://www.worldwideschool.org/library/books/sci/math/miscellaneousmathematicalconstants/chap80.html
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