Defines iterated-sums signatures over commutative semirings (tropical case emphasized) for time-series feature extraction and links them to quasisymmetric functions over semirings.
Fliess,Fonctionnelles causales non linéaires et indéterminées non commutatives, Bulletin de la société mathématique de France109 (1981), 3–40
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Tropical time series, iterated-sums signatures and quasisymmetric functions
Defines iterated-sums signatures over commutative semirings (tropical case emphasized) for time-series feature extraction and links them to quasisymmetric functions over semirings.