Mathematics – Classical Analysis and ODEs
Scientific paper
2011-06-07
Mathematics
Classical Analysis and ODEs
Scientific paper
Weyl theory for Dirac systems with rectangular matrix potentials is non-classical. The corresponding Weyl functions are rectangular matrix functions. Furthermore, they are non-expansive in the upper semi-plane. Inverse problems are treated for such Weyl functions, and some results are new even for the square Weyl functions. High energy asymptotics of Weyl functions and Borg-Marchenko type uniqueness results are derived too.
Fritzsche Bernd
Kirstein Bernd
Roitberg Ya. I.
Sakhnovich Lev A.
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