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Originalpublikation
Cuntz, M.; Holm, T.: Subpolygons in conway-coxeter frieze patterns. In: Algebraic Combinatorics 4 (2021), Nr. 4, S. 741-755. DOI: https://doi.org/10.5802/alco.180
Friezes with coefficients are maps assigning numbers to the edges and diagonals of a regular polygon such that all Ptolemy relations for crossing diagonals are satisfied. Among these, the classic Conway-Coxeter friezes are the ones where all values are positive integers and all edges have value 1. Every subpolygon of a Conway-Coxeter frieze yields a frieze with coefficients over the positive integers. In this paper we give a complete arithmetic criterion for which friezes with coefficients appear as subpolygons of Conway-Coxeter friezes. This generalizes a result of our earlier paper with Peter Jørgensen from triangles to subpolygons of arbitrary size.