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Alexandrov geometry studies non smooth analogues of Riemannian manifolds with curvature bounded from below or above. It includes spaces with curvature bounded below (briefly $\mathrm{CBB}[\kappa]$) and spaces with curvature bounded above (briefly $\mathrm{CAT}[\kappa]$).

7 votes

Minimizing geodesic on a convex surface

Just to help visualize the example, if I have interpreted the description correctly, this is one view, for $\alpha=\beta=1$, and $\epsilon=\frac{1}{16}$. In this view, the $x$-axis is horizontal, …
Joseph O'Rourke's user avatar
3 votes

Are shortest halving curves simple closed geodesics?

I just located this relevant reference: Engelstein, Max, Anthony Marcuccio, Quinn Maurmann, and Taryn Pritchard. "Isoperimetric problems on the sphere and on surfaces with density." New York J. …
Joseph O'Rourke's user avatar