Ternary parallelogram scales are MOS substitution: Difference between revisions
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=== Parallelogram scale === | === Parallelogram scale === | ||
A scale word ''w'' is a ''parallelogram scale word'' if C(''w'') is torsion-free (equiv. a free abelian group) and there | A scale word ''w'' is a ''parallelogram scale word'' if C(''w'') is torsion-free (equiv. a free abelian group) and there exist integers {{nowrap|''m'', ''n'' > 1}} and linearly independent elements '''v''' and '''w''' in C(''w'') such that the π-image of | ||
<math>\mathcal{I}_w := | <math>\mathcal{I}_w := | ||