Table of Contents
| The wave equation for stiff strings and piano tuning | |
| Xavier Gràcia, Tomás Sanz-Perela | 1-16 |
| Explicit bounds for growth of sets in non-abelian groups | |
| Alberto Espuny Díaz | 17-26 |
| Compactification of a diagonal action on the product of CAT(-1) spaces | |
| Teresa García | 27-38 |
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ISSN: 2385-4227 (electronic edition)