Lie-algebras and linear operators with invariant subspaces
| dc.creator | Turbiner, Alexander | |
| dc.date | 1993-01-16 | |
| dc.date | 1998-09-08 | |
| dc.date.accessioned | 2026-07-07T08:59:15Z | |
| dc.date.available | 2026-07-07T08:59:15Z | |
| dc.description | A general classification of linear differential and finite-difference operators possessing a finite-dimensional invariant subspace with a polynomial basis (the generalized Bochner problem) is given. The main result is that any operator with the above property must have a representation as a polynomial element of the universal enveloping algebra of some algebra of differential (difference) operators in finite-dimensional representation plus an operator annihilating the finite-dimensional invariant subspace. In low dimensions a classification is given by algebras $sl_2({\bold R})$ (for differential operators in ${\bold R}$) and $sl_2({\bold R})_q$ (for finite-difference operators in ${\bold R}$), $osp(2,2)$ (operators in one real and one Grassmann variable, or equivalently, $2 \times 2$ matrix operators in ${\bold R}$), $sl_3({\bold R})$, $sl_2({\bold R}) \oplus sl_2({\bold R})$ and $gl_2 ({\bold R}) \ltimes {\bold R}^{r+1}\ , r$ a natural number (operators in ${\bold R^2}$). A classification of linear operators possessing infinitely many finite-dimensional invariant subspaces with a basis in polynomials is presented. A connection to the recently-discovered quasi-exactly-solvable spectral problems is discussed. | |
| dc.description | 47pp, AMS-LaTeX | |
| dc.identifier | https://arxiv.org/abs/funct-an/9301001 | |
| dc.identifier | http://arxiv.org/abs/funct-an/9301001 | |
| dc.identifier | in {\em Lie algebras, cohomologies and new findings in quantum mechanics} (N. Kamran and P. J. Olver, eds.), AMS {\it Contemporary Mathematics}, vol. 160, pp. 263--310, 1994 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/147642 | |
| dc.subject | Functional Analysis | |
| dc.subject | Operator Algebras | |
| dc.subject | 81C05 (Primary) 81C40, 17B15 (Secondary) | |
| dc.title | Lie-algebras and linear operators with invariant subspaces | |
| dc.type | text |