The definition: A spherical neighborhood of a point is itself open-a-Euclidean Space in one dimension is a finite interval-Euclidean in two dimensions is a circle and Euclidean in 3-Dimensions and spheres- The blog looks the sphere in Euclidean-Geometry, non-Euclidean geometry, like sphere in a sphere or hyperbole for example, using differential geometry, topology and algebraic topology
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