Stability criteria for conjugate points of indefinite second order differential systems
Conjugate points of vector differential equations \(x''+A(t)x=0\) are called hyperconjugate points if they are realized by a positive solution. Conditions are established for the existence of stable hyperconjugate points, and these are related to a systems form of the Sturm comparison theorem.
second order vector differential equations
scientific article; zbMATH DE number 3944338