The conjecture that all compact spaces feature smeariness

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Let XX be a compact metric space, and consider random variables taking values in XX whose Fréchet means and sample Fréchet means are defined. A distribution is smeary when its Fréchet mean has a limiting convergence rate slower than the classical n−1/2n^{-1/2} rate. Compact-space smeariness conjecture. All compact spaces feature smeariness: every compact space admits a random variable featuring smeariness. This is stated in the paper as a conjecture and is presented as an open direction; the paper establishes directional smeariness under curvature bounds but does not resolve the assertion for all compact spaces.

References

Primary source

Do Tran, Benjamin Eltzner and Stephan Huckemann, “Smeariness Begets Finite Sample Smeariness”, arXiv:2103.00469 (2021).

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