1. École normale supérieure, 75005 Paris, France;2. Dipartimento di matematica, University of Rome-1, “La Sapienza”, 00185 Roma, Italy;3. Department of Mathematics, M.I.T., Cambridge, MA 02139, USA
Abstract:
We prove some algebraic results on the ring of matrix differential operators over a differential field in the generality of non-commutative principal ideal rings. These results are used in the theory of non-local Poisson structures.