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ultra- +‎ hyperbolic

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ultrahyperbolic (not comparable)

  1. (mathematics) Pertaining to an ultrahyperbolic equation.
    • 2015, D. Chernyavsky, A. Galajinsky, “Ricci-flat spacetimes with l-conformal Galilei symmetry”, in arXiv[1]:
      Ricci-flat metrics of the ultrahyperbolic signature which enjoy the l-conformal Galilei symmetry are constructed.