Tiling rhythmic canons: an introduction to a "mathemusical" problem - #VTMS

Supervisor
Greta Lanzarotto - University of Pavia
Date and time
Wednesday, November 3, 2021 at 9:00 PM
Programme Director
Marco Caliari
External reference
Publication date
October 22, 2021
Department
Computer Science  

Summary

Series #VeronesiTuttiMathSeminars #SafetyThenEnjoyMath

The talk will propose an introduction to the musical problem of the construction of canons, which are polyphonic musical pieces whose voices lead the same melody with different delays. In particular, a tiling rhythmic canon is the one whose tone onsets result in a regular pulse train with no simultaneous voices at a time. Tiling in mathematics means covering an area by disjoint equal figures and in that sense, a rhythmic canon tiles the time, providing a covering with a regular pulse train by disjoint equal rhythmic patterns.

Tiling rhythmic canons can be formalized algebraically through two equivalent models: factorization of cyclic groups and products of polynomials with coefficients 0-1 The latter, in particular, underlies the Coven-Meyerowitz conditions (T1) and (T2), which are sufficient for the existence of rhythmic canons. The Vuza canons will then be identified, i.e. canons aperiodic both in the inner and in the outer rhythm. We will see how the existence of such canons depends on the order of the factorized cyclic group: it follows a division of the class of finite cyclic groups into two disjoint subclasses, explicitly defined.

Finally, the Fuglede conjecture, still open, will be presented, and we will see how the tiling rhythmic theory can present a possible approach to the solution.

The zoom link for the seminar is https://univr.zoom.us/j/97604696910 and the password is given by the first eight significant digits of arccos(-1). In order to be informed about the next seminars, please join the following mailing-list

http://eepurl.com/gv9u9D

Marco Caliari
Matteo Frigo, Chairman of Associazione Alumni Matematica Verona





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