
arXiv: 1809.10675
Let $I\subset (0,\infty )$ be an interval that is closed with respect to the multiplication. The operations $C_{f,g}\colon I^{2}\rightarrow I$ of the form \begin{equation*} C_{f,g}\left( x,y\right) =\left( f\circ g\right) ^{-1}\left( f\left( x\right) \cdot g\left( y\right) \right) \text{,} \end{equation*} where $f,g$ are bijections of $I$ are considered. Their connections with generalized weighted quasi-geometric means is presented. It is shown that invariance question within the class of this operations leads to means of iterative type and to a problem on a composite functional equation. An application of the invariance identity to determine effectively the limit of the sequence of iterates of some generalized quasi-geometric mean-type mapping, and the form of all continuous functions which are invariant with respect to this mapping are given. The equality of two considered operations is also discussed.
arXiv admin note: substantial text overlap with arXiv:1807.04811
invariant mean, reflexivity, invariant functions, mean, iteration, 26A18, 26E60, 39B12, Mathematics - Classical Analysis and ODEs, Classical Analysis and ODEs (math.CA), FOS: Mathematics, : Mathematics [G03] [Physical, chemical, mathematical & earth Sciences], Iteration theory, iterative and composite equations, : Mathématiques [G03] [Physique, chimie, mathématiques & sciences de la terre], functional equation, aggregation function, Means
invariant mean, reflexivity, invariant functions, mean, iteration, 26A18, 26E60, 39B12, Mathematics - Classical Analysis and ODEs, Classical Analysis and ODEs (math.CA), FOS: Mathematics, : Mathematics [G03] [Physical, chemical, mathematical & earth Sciences], Iteration theory, iterative and composite equations, : Mathématiques [G03] [Physique, chimie, mathématiques & sciences de la terre], functional equation, aggregation function, Means
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