pseudocollarableとは 意味・読み方・使い方

形容詞

pseudocollarable (not comparable)

1. (mathematics) Such that there exists a neighborhood that is homeomorphic to a product, but this homeomorphism may not preserve all the desired structures or conditions that a true collar neighborhood would.
   • 2015, Karim A. Adiprasito, Louis Funar, “Hyperbolicity of contractible manifolds”, in arXiv‎:

     Answering a question going back to Gromov, we show that, for an open, polyhedral contractible manifold ${\displaystyle M}$ of dimension at least ${\displaystyle 6}$, the following conditions are equivalent: - ${\displaystyle M}$ admits a geodesically complete CAT(0) metric; - ${\displaystyle M}$ can be collapsed; - ${\displaystyle M}$ is pseudocollarable. This yields many new contractible manifolds that admit CAT(0) metrics, and it shows that the CAT(0) property of a contractible manifold is purely determined by a condition at infinity, and shows that contractible manifolds of the Whitehead type can never admit a complete CAT(0) metric.