Hofer metric from the contact point of view

Given a manifold $M$ endowed with a contact 1-form $α$, a bi-invariant pseudo-metric $\varrho_α$ is introduced on $Cont(M,α)$, the compactly supported identity component of the group of all strict contactomorphisms of $(M,α)$. For $M$ open $\varrho_α$ is a metric.

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