In order to lay a foundation for providing a soft algebraic tool in considering many problems that contain uncertainties, the notion of double-framed soft sets is introduced, and applications in BCK/BCI-algebras are discussed. The notions of double-framed soft algebras in BCK/BCI-algebras are introduced, and related properties are investigated. Characterizations of double-framed soft algebras are considered. Product and int-uni structure of double-framed soft algebras are discussed, and several examples are provided.
Young Bae Jun. Sun Shin Ahn. "Double-Framed Soft Sets with Applications in BCK/BCI-Algebras." J. Appl. Math. 2012 1 - 15, 2012. https://doi.org/10.1155/2012/178159