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Neretin and Segal independently defined a semigroup of annuli with boundary parametrizations, which is viewed as a complexification of the group of diffeomorphisms of the circle. By extending the parametrizations to quasisymmetries, we show that this semigroup is a quotient of the Teichmüller space of doubly connected Riemann surfaces by a ℤ action. Furthermore, the semigroup can be given a complex structure in two distinct, natural ways. We show that these two complex structures are equivalent, and furthermore that multiplication is holomorphic. Finally, we show that the class of quasiconformally extendible conformal maps of the disk to itself is a complex submanifold in which composition is holomorphic.

The semigroup of rigged annuli and the Teichmüller space of the annulus