Decomposition of (co)isotropic relations

Abstract

We identify thirteen isomorphism classes of indecomposable coisotropic relations between Poisson vector spaces and show that every coisotropic relation between finite-dimensional Poisson vector spaces may be decomposed as a direct sum of multiples of these indecomposables. We also find a list of thirteen invariants, each of which is the dimension of a space constructed from the relation, such that the 13-vector of multiplicities and the 13-vector of invariants are related by an invertible matrix over $\mathbb Z$. It turns out to be simpler to do the analysis above for isotropic relations between presymplectic vector spaces. The coisotropic/Poisson case then follows by a simple duality argument.

9 pages. The final publication is available at Springer via http://dx.doi.org/10.1007/s11005-016-0863-5, in a special issue of Letters in Mathematical Physics dedicated to the memory of Louis Boutet de Monvel. A free, view-only version of the final publication is available under the following link http://rdcu.be/mFXy