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A Riemannian Corollary of Helly's Theorem
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abstract
We introduce a notion of halfspace for Hadamard manifolds that is natural in the context of convex optimization. For this notion of halfspace, we generalize a classic result of Gr\"unbaum, which itself is a corollary of Helly's theorem. Namely, given a probability distribution on the manifold, there is a point for which all halfspaces based at this point have at least $\frac{1}{n+1}$ of the mass. As an application, the gradient oracle complexity of convex optimization is polynomial in the parameters defining the problem.
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Horospherically Convex Optimization on Hadamard Manifolds Part I: Analysis and Algorithms
A new class of functions, horospherically convex functions, admits gradient, subgradient, and accelerated methods with curvature-independent Euclidean rates on Hadamard manifolds.
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