On a functional-differential equation with quasi-arithmetic mean value

Shokhrukh Ibragimov
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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 $x,y\in E$, $x
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一类具有拟算术均值的泛函微分方程
本文描述了所有可微函数$\varphi,\psi\colon E\to\mathbb{R}$满足函数微分方程\begin{equation*} [\varphi(y) - \varphi(x)]\psi '\bigl(h(x,y)\bigr) = [\psi(y) - \psi(x)]\varphi '\bigl(h(x,y)\bigr), \end{equation*}对所有$x,y\in E$, $x
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