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Non-injectivity of Bures--Wasserstein barycentres in infinite dimensions

Yoav Zemel
Nov 2023
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摘要原文
We construct a counterexample to the injectivity conjecture of Masarotto et al (2018). Namely, we construct a class of examples of injective covariance operators on an infinite-dimensional separable Hilbert space for which the Bures--Wasserstein barycentre is highly non injective -- it has a kernel of infinite dimension.
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