Abstract
The paper extends the transformational approach to pairwise well-formed (PWWF) modes, represented as words over a 3-letter alphabet. In particular it addresses open problems arising from an earlier approach (Noll, T and D. Clampitt. 2018. “Kaleidoscope substitutions and pairwise well-formed modes: Major-Minor duality transformationally revisited”, Journal of Mathematics and Music. 12(3)), wherein kaleidoscope transformations were shown to generate PWWF modes, but it was not yet shown that all PWWF modes could be so generated. This gap is filled. A further problem is that the kaleidoscope transformations are not closed under composition. The final section introduces a new construction for the generation of PWWF words/modes, transformations of words on a 4-letter alphabet. A strongly-supported conjecture is that these transformations form a monoid.
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Noll, T., Clampitt, D. (2022). Transformations for Pairwise Well-Formed Modes. In: Montiel, M., Agustín-Aquino, O.A., Gómez, F., Kastine, J., Lluis-Puebla, E., Milam, B. (eds) Mathematics and Computation in Music. MCM 2022. Lecture Notes in Computer Science(), vol 13267. Springer, Cham. https://doi.org/10.1007/978-3-031-07015-0_12
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DOI: https://doi.org/10.1007/978-3-031-07015-0_12
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