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)
Singular nonlinear boundary value problems for second-order ordinary differential equations. (English) Zbl 0685.34017
The authors study the boundary value problem (1)y '' +f(x,y)=0, αy(0)-βy ' (0)=0, γy(1)+δy ' (1)=0, where f: (0,1)×(0,)(0,) is continuous and decreasing in y for each fixed x and integrable on [0,1] for each fixed y, lim y0 + f(x,y)= uniformly on compact subsets of (0,1). They establish an existence theorem for the problem (1) and state conditions under which the problem (1) has at most one positive solution. The technical arguments involve properties of solutions and the use of iterative techniques. A new fixed point theorem for cones, for decreasing mappings, is developed and used in proofs.
Reviewer: J.Ohriska

34B15Nonlinear boundary value problems for ODE