Abstract Necessary and sufficient conditions are given for mean ergodicity, power boundedness, topologizability weighted backward shift forward operators, respectively, on Köthe echelon spaces in terms of the weight sequence matrix. These evaluated special case series which allow a characterization said properties many cases. In order to demonstrate applicability our conditions, we study above ...

Abstract Let u be an analytic function in the unit disk $\mathbb{D}$ D and φ self-map of . We give characterizations symbols for which multiplication operator $M_{u}$ M u weighted composition $M_{u,\varphi }$ , φ</mml...

The hybrid averaging (HA) is an aggregation operator that uses the weighted average (WA) and the ordered weighted averaging (OWA) operator in the same formulation. In this paper, we introduce several generalizations of the HA operator by using generalized and quasi-arithmetic means, fuzzy numbers and order inducing variables in the reordering step of the aggregation process. We present the fuzz...

In this paper, we estimate essential norms of weighted composition operators and differences two on the Bergman spaces in unit ball.

This study discusses some variants of Ordered WeightedAveraging (OWA) operators and related information aggregation methods. Indetail, we define the Extended Ordered Weighted Sum (EOWS) operator and theExtended Ordered Weighted Averaging (EOWA) operator, which are applied inscientometrics evaluation where the preference is over finitely manyrepresentative works. As...