Two new papers on Parikh matrices, and a theorem checked in Lean
Four diagonals determine the Parikh matrix of a word whose letters occur at most twice; plus rigidity, ranges and a golden-ratio threshold for words with repeated letters.
#Publications
A new preprint on ternary Parikh matrices
Exact counting formulas for words with repeated letters, connecting Parikh matrices, integer partitions and numerical semigroups.
Purple Square Atlas: a visual application of Burnside’s lemma
Six geometric tiles, 336 rotation classes, and a next step toward musical composition.
Counting Melodies revision 2: from rhythms to Young diagrams
A revised manuscript, an interactive rhythm laboratory, and preserved editions of my 2005 and 2006 mathematical work.