61 citations · 309 across the 28 of their papers we have counts for
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math.FA2008★ 6 cited
Block-diagonalisation of matrices and operators
Jens Wirth
In this short note we deal with a constructive scheme to decompose a continuous family of matrices asymptotically as into blocks corresponding to groups of eigenvalu…
math.AP2008★ 5 cited
Diagonalisation schemes and applications
Kay Jachmann, Jens Wirth
These notes develop aspects of perturbation theory of matrices related to so-called diagonalisation schemes. Primary focus is on constructive tools to derive asymptotic expansions…
math.AP2008★ 28 cited
Generalised energy conservation law for the wave equations with variable propagation speed
Fumihiko Hirosawa, Jens Wirth
We investigate the long time behaviour of the -energy of solutions to wave equations with variable speed. The novelty of the approach is the combination of estimates for highe…