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Jacques-Élie Furter; Angela Maria Sitta Path formulation for multiparameter $\mathbb{D}_3$-equivariant bifurcation problems (Formulation des chemins pour des problèmes de bifurcation multi-paramétriques $\mathbb{D}_3$-équivariants) Annales de l'institut Fourier, 60 no. 4 (2010), p. 1363-1400, doi: 10.5802/aif.2558 Article PDF | Reviews MR 2722245 | Zbl 1204.37054 Class. Math.: 37G40, 58K70, 58K40, 34F10, 34F15 Keywords: Equivariant bifurcation, degenerate bifurcation, path formulation, singularity theory, 1:1-resonance, reversible systems, subharmonic bifurcation Résumé - Abstract We implement a singularity theory approach, the path formulation, to classify $\mathbb{D}_3$-equivariant bifurcation problems of corank 2, with one or two distinguished parameters, and their perturbations. The bifurcation diagrams are identified with sections over paths in the parameter space of a $\mathbb{D}_3$-miniversal unfolding $F_{\!0}$ of their cores. Equivalence between paths is given by diffeomorphisms liftable over the projection from the zero-set of $F_{\!0}$ onto its unfolding parameter space. We apply our results to degenerate bifurcation of period-$3$ subharmonics in reversible systems, in particular in the 1:1-resonance. Bibliography [2] J M Ball & D G Schaeffer, “Bifurcation and stability of homogeneous equilibrium configurations of an elastic body under dead-load tractions”, Math. Proc. Camb. Phil. Soc. 94 (1983), p. 315-339 Article | MR 715037 | Zbl 0568.73057 [3] Thomas J. Bridges & Jacques E. Furter, Singularity theory and equivariant symplectic maps, Lecture Notes in Mathematics 1558, Springer-Verlag, Berlin, 1993 MR 1290781 | Zbl 0799.58009 [4] J. W. Bruce, “Functions on discriminants”, J. London Math. Soc. (2) 30 (1984) no. 3, p. 551-567 Article | MR 810963 | Zbl 0605.58011 [5] J. W. Bruce, A. A. du Plessis & C. T. C. Wall, “Determinacy and unipotency”, Invent. 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