Symmetric expressions of order 2n with essential spectrum and deficiency index greater than n
For arbitrary n ∈ N, it shall be shown that there exist real symmetric differential expresssions of order 2n which have non-empty essential spectrum and are not in the limit point case. In particular we give an explicit form for a differential expression M such that d(M)= n + 1 and another form such d...
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| Natura: | Tesi |
| Lingua: | English |
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