J. Ostensson

most citedFollytons and the Removal of Eigenvalues for Fourth Order Differential Operators

5 citations · 5 across the 2 of their papers we have counts for

collaborators

2 papers

math.SP2011

A trace formula for differential operators of arbitrary order

J. Ostensson, D. R. Yafaev

An operator $H = H_{0} + V$ where $H_{0} = i^{- N} \partial^{N}$ ( $N$ is arbitrary) and $V$ is a differential operator of order $N - 1$ with coefficients decaying sufficiently rapidly at in…

math-ph2003★ 5 cited

Follytons and the Removal of Eigenvalues for Fourth Order Differential Operators

Jens Hoppe, Ari Laptev, Jorgen Ostensson

A non-linear functional $Q [u, v]$ is given that governs the loss, respectively gain, of (doubly degenerate) eigenvalues of fourth order differential operators $L = \partial^4 + \par…