Скачать или смотреть Spherical and elliptic geometries: an introduction | Universal Hyperbolic Geometry 33

We introduce PART II of this course on universal hyperbolic geometry: Bringin geometries together. This lecture introduces the very basic definitions of spherical geometry; lines as great circles, antipodal points, spherical triangles, circles, and some related notions on points, lines and planes in three dimensional space. The ideas are illustrated with physical models.

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