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.
A quadratically convergent algorithm for structured low-rank approximation.Foundations of Computational Mathematics, 16(2):457–492
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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.