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Gram, J.P. (1883) Über die Entwicklung reeller Funktionen in Reihen mittelst der Methode der kleinsten Quadrate. Journal für die reine und angewandte Mathematik, 94, 41-73.
https://doi.org/10.1515/crll.1883.94.41

has been cited by the following article:

• TITLE: Is the Real World, as a Part of Complex Reality?

  AUTHORS: Jean-Pierre Petit, Gilles d’Agostini

  KEYWORDS: Hermite Space, Minkowski Space, Adjoint Action, Coadjoint Action, Lie Algebra, Dynamic Group, Complex Lorentz Group, Complex Poincaré Group

  JOURNAL NAME: Journal of Modern Physics, Vol.17 No.7, July 24, 2026

  ABSTRACT: By constructing the action of the Poincaré group on the dual of his Lie algebra, Souriau revealed, in 1970, the quantities of physics as objects of pure geometry. A first draft of a complex extension is presented.