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- [34] On the stability of the functional equation f(x+y-xy)+xf(y)+yf(x)=f(x)+f(y) MATHEMATICAL INEQUALITIES & APPLICATIONS, 2004, 7 (01): : 79 - 85
- [36] On the Functional Inequality f(x)f(y)-f(xy)≤f(x)+f(y)-f(x+y)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$f(x)f(y)-f(xy)\le f(x)+f(y)-f(x+y)$$\end{document} Computational Methods and Function Theory, 2020, 20 (3-4) : 623 - 627