Tridiagonal pairs and the $\mu$-conjecture
Tridiagonal pairs and the $\mu$-conjecture
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三对角对和 $mu$ 猜想
DOI:
10.1016/j.laa.2008.08.008
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发表时间:
2009
期刊:
影响因子:
--
通讯作者:
Paul M. Terwilliger
中科院分区:
文献类型:
--
作者:
K. Nomura;Paul M. Terwilliger
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:V→V and A∗:V→V that satisfy the following conditions: (i) each of A,A∗is diagonalizable; (ii) there exists an ordering {Vi}i=0dof the eigenspaces of A such that A∗Vi⊆Vi-1+Vi+Vi+1for 0⩽i⩽d, where V-1=0 and Vd+1=0; (iii) there exists an ordering {Vi∗}i=0δof the eigenspaces of A∗such that AVi∗⊆Vi-1∗+Vi∗+Vi+1∗for 0⩽i⩽δ, where V-1∗=0 and Vδ+1∗=0; (iv) there is no subspace W of V such that AW⊆W,A∗W⊆W,W≠0, W≠V. We call such a pair a tridiagonal pair on V. It is known that d=δ and for 0⩽i⩽d the dimensions of Vi,Vd-i,Vi∗,Vd-i∗coincide. We say the pair A,A∗is sharp whenever dimV0=1. It is known that if F is algebraically closed then A,A∗is sharp. A conjectured classification of the sharp tridiagonal pairs was recently introduced by T. Ito and the second author. We present a result which supports the conjecture. Given scalars {θi}i=0d,{θi∗}i=0din F that satisfy the known constraints on the eigenvalues of a tridiagonal pair, we define an F-algebra T by generators and relations. We consider the F-algebra e0∗Te0∗for a certain idempotent e0∗∈T. Let F[x1,…,xd] denote the polynomial algebra over F involving d mutually commuting indeterminates. We display a surjective F-algebra homomorphism μ:F[x1,…,xd]→e0∗Te0∗. We conjecture thatμ is an isomorphism. We show that this μ-conjecture implies the classification conjecture, and that the μ-conjecture holds for d⩽5.
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影响因子:
1.1
作者:
K. Nomura;Paul M. Terwilliger
通讯作者:
K. Nomura;Paul M. Terwilliger
DOI:
--
发表时间:
2007
期刊:
Linear Algebra Appl 427
影响因子:
--
作者:
K;Matsumoto;T;Nakamura;H;Ochiai;H;Tsumura;Hideo NAGAI;T.Ito and P.Terwilliger
通讯作者:
T.Ito and P.Terwilliger
DOI:
--
发表时间:
2006
期刊:
Linear Algebra Appl. 413
影响因子:
--
作者:
Kazumasa Nomura;Paul Terwilliger
通讯作者:
Paul Terwilliger
影响因子:
1.1
作者:
K. Nomura;Paul M. Terwilliger
通讯作者:
K. Nomura;Paul M. Terwilliger
影响因子:
0.8
作者:
Tatsuro Ito;Paul M. Terwilliger
通讯作者:
Tatsuro Ito;Paul M. Terwilliger