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P. C. Fishburn and J. A. Reeds, <a href="http://dx.doi.org/10.1137/S0895480191219350">Bell inequalities, Grothendieck's constant and root two</a>, SIAM J. Discrete Math., Vol. 7, No. 1, Feb. 1994, pp . 48-56.
Wikipedia, <a href="http://en.wikipedia.org/wiki/Platonic solid">Platonic solid</a>.
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Steven R. Finch, Mathematical Constants, Encyclopedia of Mathematics and its Applications, vol. 94, Cambridge University Press, Section 1.1, pp. 141-163.
Steven R. Finch, Mathematical Constants, Encyclopedia of Mathematics and its Applications, vol. 94, Cambridge University Press, 2003, Section 1.1 Pythagoras' Constant, sqrt(2), , pp. 14-16.
Steven R. Finch, Mathematical Constants, Cambridge University Press, 2003, Section 1.1 Pythagoras' Constant, sqrt(2), pp. 14-16.
From Stefano Spezia, Oct 15 2024: (Start)
Equals 1 + Sum_{k>=1} (-1)^k*binomial(2*k,k)/2^(2*k) [Newton].
Equal Product_{k>=1} 1 - 1/(4*(2*k - 1)^2). (End)
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