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Euclidean, hyperbolic, discrete, convex, coarse geometry, metric spaces, comparisons in Riemannian geometry, symmetric spaces.

12 votes

Neusis constructions

There are various flavors of neusis construction. In the weakest flavor, in addition to having the marked straightedge pass through the pole point, the two marks on it are required to lie, one each, …
Lyle Ramshaw's user avatar