PT-Symmetric, Quasi-Exactly Solvable matrix Hamiltonians
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Matrix quasi exactly solvable operators are considered and new conditions are determined to test whether a matrix differential operator possesses one or several finite dimensional invariant vector spaces. New examples of $2\times 2$-matrix quasi exactly solvable operators are constructed with the emphasis set on PT-symmetric Hamiltonians.
14 pages, 1 figure, one equation corrected, results added
14 pages, 1 figure, one equation corrected, results added