In this paper, we consider the Ulam–Hyers stability of the functional equations for all , where , which arise from number theory and are connected with the characterizations of the determinant and permanent of two-by-two matrices.
"Stability of functional equations arising from number theory and determinant of matrices." Ann. Funct. Anal. 8 (3) 329 - 340, August 2017. https://doi.org/10.1215/20088752-0000017X