摘要:Based on soft sets and 𝒩-structures, the notion of (closed) 𝒩-ideal over a BCI-algebra is introduced, and related properties are investigated. Relations between 𝒩-BCI-algebras and 𝒩-ideals are established. Characterizations of a (closed) 𝒩-ideal over a BCI-algebra are provided. Conditions for an 𝒩-ideal to be an 𝒩-BCI-algebra are considered.