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In this note we investigate the asymptotic behaviour of the $s$-numbers ofthe resolvent difference of two generalized self-adjoint, maximal dissipativeor maximal accumulative Robin Laplacians on a bounded domain $\Omega$ withsmooth boundary $\partial\Omega$. For this we apply the recently introducedabstract notion of quasi boundary triples and Weyl functions from extensiontheory of symmetric operators together with Krein type resolvent formulae andwell-known eigenvalue asymptotics of the Laplace-Beltrami operator on$\partial\Omega$. It will be shown that the resolvent difference of twogeneralized Robin Laplacians belongs to the Schatten-von Neumann class of anyorder $p$ for which $p>(dim\Omega-1)/3$. Moreover, we also give a simplesufficient condition for the resolvent difference of two generalized RobinLaplacians to belong to a Schatten-von Neumann class of arbitrary small order.Our results extend and complement classical theorems due to M.Sh.Birman onSchatten-von Neumann properties of the resolvent differences of Dirichlet,Neumann and self-adjoint Robin Laplacians.

A remark on Schatten-von Neumann properties of resolvent differences of generalized Robin Laplacians on bounded domains