Quasiexactly solvable 2×2 matrix equations
Yves Brihaye, Piotr Kosiński · Journal of Mathematical Physics · 1994
The conditions under which systems of two differential eigenvalue equations are quasiexactly solvable are investigated. These systems reveal a rich set of algebraic structures. Some of them are explicitly described. An example of a quasiexactly solvable system which provides a direct counterpart of the Lamé equation is studied.