### Abstract

The purpose of this paper is to investigate the invariance of the arithmetic mean with respect to two weighted Bajraktarević means, i.e., to solve the functional equation (Formula presented.)where (Formula presented.) are unknown continuous functions such that g, k are nowhere zero on I, the ratio functions f / g, h / k are strictly monotone on I, and (Formula presented.) are constants different from each other. By the main result of this paper, the solutions of the above invariance equation can be expressed either in terms of hyperbolic functions or in terms of trigonometric functions and an additional weight function. For the necessity part of this result, we will assume that (Formula presented.) are four times continuously differentiable.

Original language | English |
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Pages (from-to) | 1-21 |

Number of pages | 21 |

Journal | Aequationes Mathematicae |

DOIs | |

Publication status | Accepted/In press - May 11 2018 |

### Keywords

- Bajraktarević mean
- Functional equation
- Invariance equation
- Invariant mean

### ASJC Scopus subject areas

- Mathematics(all)
- Discrete Mathematics and Combinatorics
- Applied Mathematics

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## Cite this

*Aequationes Mathematicae*, 1-21. https://doi.org/10.1007/s00010-018-0560-9