The space of Schwarz-Klein triangles
2020
We describe the space of spherical triangles (in the sense of Schwarz and Klein). It is a smooth connected orientable 3-manifold, homotopy equivalent to the 1-skeleton of the cubic partition of the closed first octant in $\mathbf{R}^3$. The angles and sides are real analytic functions on this manifold which embed it to $\mathbf{R}^6$.
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