{"title":"On a functional-differential equation with quasi-arithmetic mean value","authors":"Shokhrukh Ibragimov","doi":"10.29229/uzmj.2020-2-6","DOIUrl":null,"url":null,"abstract":"In this paper we describe all differentiable functions $\\varphi,\\psi\\colon E\\to\\mathbb{R}$ satisfying the functional-differential equation \\begin{equation*} [\\varphi(y) - \\varphi(x)]\\psi '\\bigl(h(x,y)\\bigr) = [\\psi(y) - \\psi(x)]\\varphi '\\bigl(h(x,y)\\bigr), \\end{equation*} for all $x,y\\in E$, $x<y$, where $E \\subseteq \\mathbb{R}$ is a nonempty open interval, $h(\\cdot,\\cdot)$ is a quasi-arithmetic mean, i.e. $h(x,y)=H^{-1}(\\alpha H (x)+\\beta H (y))$, $x,y\\in E$, for some differentiable and strictly monotone function $H\\colon E \\to H(E)$ and fixed $\\alpha, \\beta\\in (0,1)$ with $\\alpha+\\beta=1$.","PeriodicalId":8451,"journal":{"name":"arXiv: Classical Analysis and ODEs","volume":"33 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2020-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"arXiv: Classical Analysis and ODEs","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.29229/uzmj.2020-2-6","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
In this paper we describe all differentiable functions $\varphi,\psi\colon E\to\mathbb{R}$ satisfying the functional-differential equation \begin{equation*} [\varphi(y) - \varphi(x)]\psi '\bigl(h(x,y)\bigr) = [\psi(y) - \psi(x)]\varphi '\bigl(h(x,y)\bigr), \end{equation*} for all $x,y\in E$, $x