A 'straight line ' on a sphere is a great circle, and it is well known that the sum of the interior angles of any triangle on a sphere whose sides are arcs of great circles exceeds 180 brvbar Show that the amount by which a vector is rotated by parallel transport around such a triangle (as in Fig 6 3) equals the excess of the sum of the angles over 180 brvbar B

Question: A 'straight line' on a sphere is a great circle, and it is well known that the sum of the interior angles of any triangle

A 'straight line' on a sphere is a great circle, and it is well known that the sum of the interior angles of any triangle on a sphere whose sides are arcs of great circles exceeds 180—¦. Show that the amount by which a vector is rotated by parallel transport around such a triangle (as in Fig. 6.3) equals the excess of the sum of the angles over 180—¦.

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