Generic existence and uniqueness of means in tree shape spaces

Let Xˉ\bar{X}, Xˉˉ\bar{\bar{X}}, Zˉ\bar{Z}, and Zˉˉ\bar{\bar{Z}} be the tree shape spaces introduced in the paper, and let x1,,xnx_1,\ldots,x_n be points in one of these spaces. A set of points is generic when it avoids the nongeneric configurations where the local CAT(0)CAT(0) property fails.

Generic means conjecture. For a generic set of points x1,,xnx_1,\ldots,x_n in Xˉ\bar{X}, Xˉˉ\bar{\bar{X}}, Zˉ\bar{Z}, or Zˉˉ\bar{\bar{Z}}, means exist and are unique.

The conjecture proposes that the existence and uniqueness results established at points within CAT(0)CAT(0) injectivity neighborhoods extend to generic configurations, despite the failure of the CAT(0)CAT(0) property at certain highly nongeneric points. The supplied text does not state whether this conjecture has been resolved.

Sources & referencesView supporting material

Primary source

Aasa Feragen, Pechin Lo, Marleen de Bruijne, Mads Nielsen and Francois Lauze, “Towards a theory of statistical tree-shape analysis”, arXiv:1207.5371 (2012).

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