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A classification of sharp tridiagonal pairs
Authors:Tatsuro Ito  Kazumasa Nomura
Affiliation:a Division of Mathematical and Physical Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
b College of Liberal Arts and Sciences, Tokyo Medical and Dental University, 2-8-30 Kohnodai, Ichikawa 272-0827, Japan
c Department of Mathematics, University of Wisconsin, 480 Lincoln Drive, Madison, WI 53706-1388, USA
Abstract:
Let F denote a field and let V denote a vector space over F with finite positive dimension. We consider a pair of linear transformations A:VV and A:VV that satisfy the following conditions: (i) each of A,A is diagonalizable; (ii) there exists an ordering View the MathML source of the eigenspaces of A such that AViVi-1+Vi+Vi+1 for 0?i?d, where V-1=0 and Vd+1=0; (iii) there exists an ordering View the MathML source of the eigenspaces of A such that View the MathML source for 0?i?δ, where View the MathML source and View the MathML source; (iv) there is no subspace W of V such that AWW, AWW, W≠0, WV. We call such a pair a tridiagonal pair on V. It is known that d=δ and for 0?i?d the dimensions of View the MathML source coincide. The pair A,A is called sharp whenever View the MathML source. It is known that if F is algebraically closed then A,A is sharp. In this paper we classify up to isomorphism the sharp tridiagonal pairs. As a corollary, we classify up to isomorphism the tridiagonal pairs over an algebraically closed field. We obtain these classifications by proving the μ-conjecture.
Keywords:Primary: 15A21   Secondary: 05E30, 05E35
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