The Riemann curvature of a unit sphere is sine-squared theta, where theta is the usual azimuthal angle in spherical co-ordinates, and this is shown in many textbooks. But since a sphere is completely specified by its radius, then as far as I can see its curvature should be a function of its radius only and I cannot see how theta is involved or what value it would be given.(adsbygoogle = window.adsbygoogle || []).push({});

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# Riemann curvature of a unit sphere

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