On some properties of the quasisymmetry quotients of functions
The author offers the detemination of all real valued injective (one-to-one) functions \(f\) on \(\mathbb{R}\) for which \([f(x+y)-f(x)]/[f(x)-f(x-y)]\) is independent of \(y>0\) or of \(x\in\mathbb{R}\) (in the latter case the dependence of the quotient on \(y\) is supposed to be continuous).
scientific article; zbMATH DE number 1346976