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G-Invariant Representations using Coorbits: Bi-Lipschitz Properties

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arxiv 2308.11784 v4 pith:7QJOEGWM submitted 2023-08-22 math.RT

classification math.RT
keywords embeddingsbi-lipschitzcoorbitsfinitespacestableachievedacting
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abstract

Consider a finite dimensional real vector space and a finite group acting unitarily on it. We study the general problem of constructing Euclidean stable embeddings of the quotient space of orbits. Our embedding is based on subsets of sorted coorbits. Our main result shows that, whenever such embeddings are injective, they are automatically bi-Lipschitz. Additionally, we demonstrate that stable embeddings can be achieved with reduced dimensionality, and that any continuous or Lipschitz $G$-invariant map can be factorized through these embeddings.

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Forward citations

Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Coarea Reduction, Sparse Transfer, and Geometric Recomposition for Synchronized Singular Forms

    math.FA 2026-03 accept novelty 7.0 of 10

    For planar rotations, real phase retrieval, and finite reflection groups, linear transforms of max filter banks achieve distortion arbitrarily close to the Euclidean distortion of the orbit space.

  2. Estimating the Euclidean distortion of an orbit space

    math.MG 2025-06 accept novelty 7.0 of 10

    The paper derives exact Euclidean distortion values for several orbit spaces, including cyclic quotients of C^n, seven wallpaper group quotients, and two-sided bounds for O(r), SO(r), E(r), and SE(r) actions.

  3. Learning collective variables that respect permutational symmetry

    physics.chem-ph 2025-07 conditional novelty 6.0 of 10

    Sort-based featurization plus autoencoders with an orthogonality loss yields permutation-symmetric collective variables whose reduced-model committor serves as a reaction coordinate for Lennard-Jones cluster transition rates.

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