Correlation between Angle and Side

Details Correlation between Angle and Side Correlation between Angle and Side

2010-12-03

arxiv.org/abs/1012.0781v2

Mathematics

Probability

12 pages

Scientific paper

Let alpha be an arbitrary angle in a random spherical triangle Delta and a be the side opposite alpha. (The sphere has radius 1; vertices of Delta are independent and uniform.) If some other side is constrained to be pi/2, then E(alpha*a)=3.05.... If instead some other angle is fixed at pi/2, then E(alpha*a)=2.87.... In our study of the latter scenario, both Apery's constant and Catalan's constant emerge. We also review Miles' 1971 proof that E(alpha*a)=pi^2/2-2 when no constraints are in place.

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