@article{Sezgek2025, 
author = {Şeyda Sezgek and İlhan Daǧadur},
title = {ν  −Conull FDK-spaces},
year = {2025},
journal = {AIMS Mathematics},
volume = {10},
number = {11},
pages = {25708-25728},
keywords = {double sequence spaces, FDK-space, distinguished subspace, matrix domain, ν-convergence, separable FDK-space},
url = {https://www.sciopen.com/article/10.3934/math.20251138},
doi = {10.3934/math.20251138},
abstract = {In this paper, we introduced the concepts of (strongly)    ν-conull FDK-spaces, which can be regarded as double-indexed versions of FK-spaces (sequence space with coordinate functionals), by utilizing the notion of    ν-convergence for double sequences. We provided fundamental characterizations of these new spaces and established several inclusion relations among them. Furthermore, we investigated the conditions under which the summability domain        E    A          (      ν      )       is (strongly)    ν-conull, thereby providing new insights into its structural and topological properties.}
}