WIAS Preprint No. 2796, (2020)

The moving frame method for iterated-integrals: Orthogonal invariants


Authors

  • Diehl, Joscha
  • Preiß, Rosa
  • Ruddy, Michael
  • Tapia, Nikolas
    ORCID: 0000-0003-0018-2492

2010 Mathematics Subject Classification

  • 60L10 14L24

Keywords

  • Signature, geometric invariants, moving frame, orthogonal group

DOI

10.20347/WIAS.PREPRINT.2796

Abstract

We explore the algebraic properties of a generalized version of the iterated-sums signature, inspired by previous work of F. Kiraly and H. Oberhauser. In particular, we show how to recover the character property of the associated linear map over the tensor algebra by considering a deformed quasi-shuffle product of words on the latter. We introduce three non-linear transformations on iterated-sums signatures, close in spirit to Machine Learning applications, and show some of their properties.

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