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2sin⁡2(θ/2)/π2\sin^2(\theta/2)/\pi

Why this formula appears here

This expression follows from the Haar distribution of rotation angle, whose density on [0,π\pi] is 2sin⁡2(θ/2)\sin^2(\theta/2)/π\pi . It passes the limiting checks: at ϵ\epsilon=0 , blind success is zero; at ϵ\epsilon=π\pi , it is one. The redundancy definition is informative only when 1-δ\delta>pblind(ϵ)p_{\mathrm{blind}}(\epsilon) . Otherwise an empty box can qualify as a witness.

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θ\theta

Symbol θ

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2sin⁡2(θ/2)/π2\sin^2(\theta/2)/\pi

Equation 49 · Evolutionary Physics

A Reference Frame Becomes Classical by Publishing Its Orientation

This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.

This expression follows from the Haar distribution of rotation angle, whose density on [0,π\pi] is 2sin⁡2(θ/2)\sin^2(\theta/2)/π\pi . It passes the limiting checks: at ϵ\epsilon=0 , blind success is zero; at ϵ\epsilon=π\pi , it is one. The redundancy definition is informative only when 1-δ\delta>pblind(ϵ)p_{\mathrm{blind}}(\epsilon) . Otherwise an empty box can qualify as a witness.

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