Antieigenvalue theory

Antieigenvalue theory is not a widely recognized term in mathematics or physics, and it doesn’t appear to be a standard concept within the established literature. It’s possible that it could refer to a niche area of study, a new research development, or even a typographical error or misunderstanding of another concept such as "eigenvalue theory." Eigenvalue theory is a significant concept in linear algebra involving eigenvalues and eigenvectors associated with matrices or linear transformations.