= Introduction to Differential Geometry by Mark Powell
{c}
{tag=Work by Mark Powell}
{title2=2014}
https://www.maths.gla.ac.uk/~mpowell/DiffGeomCurvesSurfaces.html
https://www.maths.gla.ac.uk/~mpowell/M435-intro-chapter-1-geometry-of-curves.pdf
https://www.maths.gla.ac.uk/~mpowell/M435-chapter-6-gauss-bonnet.pdf
Consulted passages: Part I §§2.1, 2.5–2.8 (arc length, curvature, torsion, spherical frames); Part VI §§7.1–7.5 (boundary terms, geodesic polygons, global Gauss-Bonnet and proof).
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