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In Generalized Musical Intervals and Transformations, chapter 4, Dawid Lewin describes a group of rythmic rhythmic intervals with the group operation $(i,p)*(j,q) = (i + pj,pq)$, where $i,j,p$ and $q$ are rationals.

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In Generalized Musical Intervals and Transformations, chapter 4, Dawid Lewin describes a group of rythmic intervals with the group operation $(i,p)*(j,q) = (i + pj,pq)$, where $i,j,p$ and $q$ are rationals.