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New results on additive generator pairs of overlap and grouping functions

Liang Li-zhiWang Xue-ping — 2025

Kybernetika

In this article, we deeply reveal the relationship between functions θ and ϑ in an overlap function additively generated by an additive generator pair ( θ , ϑ ), which is used to characterize the conditions for an overlap function additively generated by the pair being a triangular norm by terms of functions θ and ϑ . We also establish the conditions that an overlap function additively generated by the additive generator pair can be obtained by a distortion of a triangular norm and a (pseudo) automorphism....

Embedded eigenvalues and resonances of Schrödinger operators with two channels

Xue Ping Wang — 2007

Annales de la faculté des sciences de Toulouse Mathématiques

In this article, we give a necessary and sufficient condition in the perturbation regime on the existence of eigenvalues embedded between two thresholds. For an eigenvalue of the unperturbed operator embedded at a threshold, we prove that it can produce both discrete eigenvalues and resonances. The locations of the eigenvalues and resonances are given.

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