On Combined Standard-Nonstandard or Hybrid (q,h)-Deformations

Abstract

Combined $(q,h)$-deformations proposed by Kupershmidt and Ballesteros-Herranz-Parashar are studied. In each case a transformation is shown to lead to an equivalent, standard $q$-deformation. We briefly indicate that appropriate singular limits of the same type of transformations can however lead from standard biparametric $(p,q)$-deformations to non-hybrid but biparametric nonstandard $(g,h)$ ones. Finally a case of hybrid $(q,h)$-deformation is recalled, related to the superalgebra $GL(1|1)$.

17 pages, LaTeX2e, using packages: amsfonts, amsmath; V2: added preprint number, corrected misprints; J. Math. Phys., to appear

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