Alternating projections on cleanly intersecting C^{2,1} submanifolds induce a retraction (second-order under C^{3,1}) on the intersection, with NewtonSLRA as an explicit second-order example.
Proximal gradient method for nonsmooth optimization over the Stiefel manifold.SIAM Journal on Optimization, 30(1):210–239, 2020
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Retractions by Alternating Projections
Alternating projections on cleanly intersecting C^{2,1} submanifolds induce a retraction (second-order under C^{3,1}) on the intersection, with NewtonSLRA as an explicit second-order example.