# Rendiconti dell'Istituto di Matematica dell'Università di Trieste: an International Journal of Mathematics vol.32 (2001) s1

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**CONTENTS**

*Gennaro Amendola, Riccardo Benedetti, Francesco Costantino and Carlo Petronio *Branched spines of 3-manifolds and Reidemeister torsion of Euler structures

*Mark Baker, Michel Boileau and Shicheng Wang *Towers of covers of hyperbolic 3-manifolds

*Stuart Bratholdt and Daryl Cooper *On the topology ofthe character variety of a free group

*Maria Rita Casali and Carlo Gagliardi *A code for m-bipartite edge-coloured graphs

*Alberto Cavicchioli, Friedrich Hegenbarth and Dušan Repovš *Special classes of closed four-manifolds

*Scipio Cuccagna *La stabilità asintotica dei ground states della NLS

*Francesco Domenicucci, Massimo Ferri and Giorgio Nicoletti *Local triangle choice for impact computation in the tactile exploration of a virtual surface

*Claude Hayat-Legrand, Elena Kudryavtseva, Shicheng Wang and Heiner Zieschang *Degrees of self-mappings of Seifert manifolds with finite fundamental groups

*Sadayoshi Kojima *Complex hyperbolic cone structures on theconfiguration spaces

*Mattia Mecchia *Hyperbolic 2-fold branched coverings

*Alexander Mednykh, Marco Reni, Andrei Vesnin and Bruno Zimmermann *Three-fold coverings and hyperelliptic manifolds: a three-dimensional version of a result of Accola

*Michele Mulazzani and Riccardo Piergallini *Lifting braids

*Luisa Paoluzzi *On hyperbolic type involutions

*Luisa Paoluzzi and Bruno Zimmermann *Finite quotients of the Picard group and related hyperbolic tetrahedral and Bianchi groups

*Marco Reni and Andrei Vesnin *Hidden symmetries of cyclicbranched coverings of 2-bridge knots

*Marco Reni and Bruno Zimmermann *Finite simple groups acting on 3-manifolds and homology spheres

*Yo’av Rieck *Genus reducing knots in 3-manifolds

*Beatrice Ruini and Fulvia Spaggiari *Manifold spines and hyperbolicity equations

*Makoto Sakuma *Surgery description of orientation-preserving periodic maps on compact orientable 3- manifolds

*Martin Scharlemann *Heegaard reducing spheres for the 3-sphere

*Jeffrey R. Weeks *A robust algorithm to determine the topology of space from the cosmic microwave background radiation

## Details

** Editorial policy**
The journal *Rendiconti dell’Istituto di Matematica dell’università di Trieste * publishes original articles in all areas of mathematics. Special regard is given to research papers, but attractive expository papers may also be considered for publication.
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