zbMATH — the first resource for mathematics

Geometry Search for the term Geometry in any field. Queries are case-independent.
Funct* Wildcard queries are specified by * (e.g. functions, functorial, etc.). Otherwise the search is exact.
"Topological group" Phrases (multi-words) should be set in "straight quotation marks".
au: Bourbaki & ti: Algebra Search for author and title. The and-operator & is default and can be omitted.
Chebyshev | Tschebyscheff The or-operator | allows to search for Chebyshev or Tschebyscheff.
"Quasi* map*" py: 1989 The resulting documents have publication year 1989.
so: Eur* J* Mat* Soc* cc: 14 Search for publications in a particular source with a Mathematics Subject Classification code (cc) in 14.
"Partial diff* eq*" ! elliptic The not-operator ! eliminates all results containing the word elliptic.
dt: b & au: Hilbert The document type is set to books; alternatively: j for journal articles, a for book articles.
py: 2000-2015 cc: (94A | 11T) Number ranges are accepted. Terms can be grouped within (parentheses).
la: chinese Find documents in a given language. ISO 639-1 language codes can also be used.

a & b logic and
a | b logic or
!ab logic not
abc* right wildcard
"ab c" phrase
(ab c) parentheses
any anywhere an internal document identifier
au author, editor ai internal author identifier
ti title la language
so source ab review, abstract
py publication year rv reviewer
cc MSC code ut uncontrolled term
dt document type (j: journal article; b: book; a: book article)
On higher-order differential operators with a singular point. (English) Zbl 0786.34027
The paper is concerned with a very specific inverse spectral problem. This problem is formulated as follows: Given the Weyl matrix ${\germ M}(\lambda)$, construct a differential operator $l$ associated with the higher-order differential equation $$ly\equiv y\sp{(n)}+ \sum\sp{n- 2}\sb{j=0} \left({\nu\sb j\over x\sp{n-j}}+ q\sb j(x)\right) y\sp{(j)}=\lambda y\quad (x>0)\tag1$$ on the half-line. There are pointed out special fundamental systems of solutions of (1). Moreover, a uniqueness theorem for the inverse problem is presented. In this context, the main equation of the inverse problem is obtained. Conditions on the Weyl matrix and an algorithm of solution of the inverse problem complete the paper.

34A55Inverse problems of ODE
Full Text: DOI