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- W4288267002 abstract "This paper introduces a new notion of a Fenchel conjugate, which generalizes the classical Fenchel conjugation to functions defined on Riemannian manifolds. We investigate its properties, e.g.,~the Fenchel--Young inequality and the characterization of the convex subdifferential using the analogue of the Fenchel--Moreau Theorem. These properties of the Fenchel conjugate are employed to derive a Riemannian primal-dual optimization algorithm, and to prove its convergence for the case of Hadamard manifolds under appropriate assumptions. Numerical results illustrate the performance of the algorithm, which competes with the recently derived Douglas--Rachford algorithm on manifolds of nonpositive curvature. Furthermore, we show numerically that our novel algorithm even converges on manifolds of positive curvature." @default.
- W4288267002 created "2022-07-28" @default.
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- W4288267002 date "2019-08-06" @default.
- W4288267002 modified "2023-10-16" @default.
- W4288267002 title "Fenchel Duality Theory and A Primal-Dual Algorithm on Riemannian Manifolds" @default.
- W4288267002 doi "https://doi.org/10.48550/arxiv.1908.02022" @default.
- W4288267002 hasPublicationYear "2019" @default.
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