Escaping a neighborhood along a prescribed sequence in Lie groups and Banach algebras

Catalin Badea (1) , Vincent Devinck (2) , Sophie Grivaux (1, 3)

1 LPP - Laboratoire Paul Painlevé - UMR 8524
2 LML - Laboratoire de Mathématiques de Lens
3 CNRS - Centre National de la Recherche Scientifique

It is shown that Jamison sequences, introduced in 2007 by Badea and Grivaux, arise naturally in the study of topological groups with no small subgroups, of Banach or normed algebra elements whose powers are close to identity along subsequences, and in characterizations of (self-adjoint) positive operators by the accretiveness of some of their powers. The common core of these results is a description of those sequences for which non-identity elements in Lie groups or normed algebras escape an arbitrary small neighborhood of the identity in a number of steps belonging to the given sequence. Several spectral characterizations of Jamison sequences are given and other related results are proved.

Domaines: Mathématiques [math]; Analyse fonctionnelle [math.FA]; Théorie des groupes [math.GR]

Catalin Badea, Vincent Devinck, Sophie Grivaux. Escaping a neighborhood along a prescribed sequence in Lie groups and Banach algebras. Canadian Mathematical Bulletin, 2020, 63 (3), pp.484-505. ⟨10.4153/S0008439519000560⟩. ⟨hal-02308604⟩