Positive Fixed Points of Hammerstein Integral Operators with Degenerate Kernel

Abstract

Positive fixed points of the Hammerstein integral operators with a degenerate kernel in the space of continuous functions C [0, 1] were explored. The problem of determining the number of positive fixed points of the Hammerstein integral operator was reduced to analyzing the positive roots of polynomials with real coefficients. A model on a Cayley tree with nearestneighbor interactions and with the set [0, 1] of spin values was considered. It was proved that a unique translation-invariant Gibbs measure exists for this model.

Keywords

• fixed point
• hammerstein integral operator
• cayley tree
• gibbs measure
• translation-invariant gibbs measure