EQUIVALENCE CLASSES OF SUBQUOTIENTS OF PSEUDODIFFERENTIAL OPERATOR MODULES

作者：Conley Charles H^*; Larsen Jeannette M

来源：Transactions of the American Mathematical Society, 2015, 367(12): 8809-8842.

Consider the spaces of pseudodifferential operators between tensor density modules over the line as modules of the Lie algebra of vector fields on the line. We compute the equivalence classes of various subquotients of these modules. There is a 2-parameter family of subquotients with any given Jordan-Holder composition series. In the critical case of subquotients of length 5, the equivalence classes within each non-resonant 2-parameter family are specified by the intersections of a pencil of conics with a pencil of cubics. In the case of resonant subquotients of length 4 with self-dual composition series, as well as in those of lacunary subquotients of lengths 3 and 4, equivalence is specified by a single pencil of conics. Non-resonant subquotients of length exceeding 7 admit no non-obvious equivalences. The cases of lengths 6 and 7 are unresolved.

• 出版日期2015-12