On the deficiency index of even order sy
โ
Marian P. Roque; Bernd Schultze
๐
Article
๐
2011
๐
John Wiley and Sons
๐
English
โ 96 KB
## Abstract It shall be shown that for every __n__, \documentclass{article}\usepackage{amssymb}\pagestyle{empty}\begin{document}$k \in \mathbb {N}$\end{document} with __n__ โฉฝ __k__ < 2__n__, there exist real symmetric differential expressions __M__ of order 2__n__ with nonempty essential spectrum s