Abstract
In this paper, we firstly introduce the notion of a near approximations in a group, which is an extended notion of a rough approximations in a group. Then we define lower and upper near subgroups based on normal subgroups in a group and give some properties of such subgroups. Furthermore, we obtain a comparison between these types of approximations and the approximation introduced by Kuroki and Wang (Inf Sci 90:203–220, 1996).
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Bağırmaz, N. Near approximations in groups. AAECC 30, 285–297 (2019). https://doi.org/10.1007/s00200-018-0373-z
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DOI: https://doi.org/10.1007/s00200-018-0373-z