Acta Mathematica Vietnamica

Acta Mathematica Vietnamica

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Fifteen years of contact circles and contact spheres

Hansjörg Geiges , Jesús Gonzalo Pérez

pp. 145-164

Abstract

Contact circles and contact spheres are geometric structures on 3-manifolds introduced by the authors some fifteen years ago. In this survey we review the main results about these structures and we include two as yet unpublished proofs.