Mathematics – Classical Analysis and ODEs
Scientific paper
2008-05-09
Journal of Approximation Theory, 156 (1): 52-81, January 2009
Mathematics
Classical Analysis and ODEs
22 pages and 2 figures, updated to reflect publication in JAT and the DOI
Scientific paper
10.1016/j.jat.2008.03.005
We show that high-dimensional analogues of the sine function (more precisely, the d-dimensional polar sine and the d-th root of the d-dimensional hypersine) satisfy a simplex-type inequality in a real pre-Hilbert space H. Adopting the language of Deza and Rosenberg, we say that these d-dimensional sine functions are d-semimetrics. We also establish geometric identities for both the d-dimensional polar sine and the d-dimensional hypersine. We then show that when d=1 the underlying functional equation of the corresponding identity characterizes a generalized sine function. Finally, we show that the d-dimensional polar sine satisfies a relaxed simplex inequality of two controlling terms "with high probability".
Lerman Gilad
Whitehouse Jonathan Tyler
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