English: Intrinsic curvature of the sphere: if you parallel-transport a vector around the closed loop ANB, the vector is shifted proportionally to the area delimited by the closed loop and to the curvature of the sphere.
Italiano: Curvatura intrinseca della sfera: dopo il trasporto parallelo di un vettore lungo il percorso chiuso ANB, il vettore subisce un deviazione proporzionale alla superficie dell'area racchiusa dal percorso e alla curvatura della sfera.
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