Aequationes mathematicae

, Volume 84, Issue 1, pp 77-90

First online:

The equality problem in the class of conjugate means

  • Pál BuraiAffiliated withFaculty of Informatics, University of DebrecenDepartment of Mathematics, TU Berlin
  • , Judita DascălAffiliated withMathematics Research Unit, University of Luxembourg Email author 

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Let \({I\subset\mathbb{R}}\) be a nonempty open interval and let \({L:I^2\to I}\) be a fixed strict mean. A function \({M:I^2\to I}\) is said to be an L-conjugate mean on I if there exist \({p,q\in{]}0,1]}\) and a strictly monotone and continuous function φ such that
for all \({x,y\in I}\) . Here L(x, y) is a fixed quasi-arithmetic mean. We will solve the equality problem in this class of means.

Mathematics Subject Classification (2000)

Primary 39B22 Secondary 39B12 26E60


Mean functional equation quasi-arithmetic mean conjugate mean