Elliptic quadratic forms, focal points, and a generalized theory of oscillation

DOI10.1016/0022-247X(75)90109-2zbMath0341.34019MaRDI QIDQ1231591

K. Appert

Publication date: 1975

Published in: Journal of Mathematical Analysis and Applications (Search for Journal in Brave)

Mathematics Subject Classification ID

Periodic solutions to ordinary differential equations (34C25) Analytical theory of ordinary differential equations: series, transformations, transforms, operational calculus, etc. (34A25) Oscillation theory, zeros, disconjugacy and comparison theory for ordinary differential equations (34C10) Abstract approximation theory (approximation in normed linear spaces and other abstract spaces) (41A65)

Cites Work

• Unnamed Item
• Oscillation theorems for second order linear differential equations
• Focal points in a control problem
• An approximation theory for elliptic quadratic forms on Hilbert spaces: Application to the eigenvalue problem for compact quadratic forms
• A theory of numerical approximation for elliptic forms associated with second order differential systems: Application to eigenvalue problems
• Applications of the theory of quadratic forms in Hilbert space to the calculus of variations
• A Theory of Focal Points and Focal Intervals for an Elliptic Quadratic Form on a Hilbert Space