Abstract
Recently, J. McKay [7] has observed that the irreducible complex representations of the binary polyhedral groups can be arranged in order to form the vertices of a Euclidean diagram in such a way that the tensor product of any irreducible representation M with the standard two-dimensional representation is the direct sum of the irreducible representations which are the neighbors of M in the diagram, and he asked for an explanation. In this note, we will show that any self-dual two-dimensional representation gives rise to a generalized Euclidean diagram, and that this in fact can be used to give a proof of the classification theorem of the binary polyhedral groups which at the same time furnishes a list of the irreducible representations and also gives the minimal splitting field.
Similar content being viewed by others
References
Arnold, V.: The A-D-E-classifications. In: Mathematical developments arising from Hilbert problems (ed. F. E. Browder). Proceedings Symposia Pure Math. vol28, Providence (1976), 46
Berman, S; Moody, R.; Wonenburger, M.: Cartan matrices with null roots and finite Cartan matrices. Indiana Math. J.21 (1972), 1091–1099
Dornhoff, L.: Group representation theory, vol. A. Marcel Dekker, New York 1971
Happel, D.; Preiser, U.; Ringel, C. M.: Vinberg's characterization of Dynkin Diagrams using subadditive functions with application to D Tr—periodic modules. To appear in Proc. Ottawa Conf. Representation Theory of Algebras (1979). Springer Lecture Notes
Huppert, B.: Endliche Gruppen I. Springer, Berlin 1967
Klein, F.: Vorlesungen über das Ikosaeder und die Auflösungen der Gleichungen vom fünften Grade. Leipzig, Teubner, 1884
McKay, J.: Affine diagrams and character tables. To appear
Springer, T. A.: Invariant theory. Springer Lecture Notes in Mathematics.585 (1977)
Weber, H.: Lehrbuch der Algebra, Band II (2. Auflage) Braunschweig 1899
Vinberg, E. B.: Discrete linear groups generated by reflections. Izv. Akad. Nauk SSSR. Ser. Mat.35(1971), Engl. translation: Math. USSR Izv.5(1971), 1083–1119
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Happel, D., Preiser, U. & Ringel, C.M. Binary polyhedral groups and Euclidean diagrams. Manuscripta Math 31, 317–329 (1980). https://doi.org/10.1007/BF01303280
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF01303280