Abstract
It is well known that the compatible linear and quadratic Poisson brackets of the full symmetric and of the standard open Toda lattices are restrictions of linear and quadratic r-matrix Poisson brackets on the associative algebra mathrm {gl}(n,{mathbb {R}}). We here show that the quadratic bracket on mathrm {gl}(n,{mathbb {R}}), corresponding to the r-matrix defined by the splitting of mathrm {gl}(n,{mathbb {R}}) into the direct sum of the upper triangular and orthogonal Lie subalgebras, descends by Poisson reduction from a quadratic Poisson structure on the cotangent bundle T^* mathrm {GL}(n,{mathbb {R}}). This complements the interpretation of the linear r-matrix bracket as a reduction of the canonical Poisson bracket of the cotangent bundle.
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