Abstract
Binary relations play an important role in both mathematics and information sciences. In this paper, we focus our discussion on a fuzzy set which is approximated in the sense of the aftersets and foresets. To this end, a soft binary relation has been used. A new approach is being introduced to get two sets of fuzzy soft sets, called the lower approximation and upper approximation regarding the aftersets and foresets. We applied these concepts on semigroups and approximations of fuzzy subsemigroups, fuzzy left (right) ideals, fuzzy interior ideals and fuzzy bi-ideals of semigroups are studied.
Similar content being viewed by others
References
Aktas H, Çagman N (2007) Soft sets and soft groups. Inf Sci 177:2726–2735
Ali MI, Feng F, Liu XY, Min WK, Shabir M (2009) On some new operations in soft set theory. Comput Math Appl 57:1547–1553
Ali MI, Shabir M, Tanveer S (2012) Roughness in hemirings. Neural Comput Appl 21(1):171–180
Banerjee M, Chakraborty MK (1994) Rough consequence and rough algebra. In: Ziarko WP (ed) Rough sets, fuzzy sets and knowledge discovery. Workshops in Computing. Springer, London. https://doi.org/10.1007/978-1-4471-3238-7_24
Bhakat SK, Das P (1996) \((\in,\in \vee q)-\)fuzzy subgroups. Fuzzy Set Syst 80:359–368
Biswas R, Nanda S (1994) Rough groups and rough subgroups. Bull Polish Acad Sci Math 42:251–254
Bonikowski Z (1992) A certain conception of the calculus of rough sets. Notre Dame J Formal Log 33:412–421
Bonikowski Z (1995) Algebraic structures of rough sets. In: Ziarko WP (ed) Rough sets, fuzzy sets and knowledge discovery. Springer, Berlin, pp 242–247
Bonikowski Z, Bryniariski E, Skardowska UW (1998) Extensions and intentions in the rough set theory. Inf Sci 107:149–167
Bryniarski E (1989) A calculus of rough sets of the first order. Bull Polish Acad Sci Math 37:71–77
Davvaz B (2004) Roughness in rings. Inf Sci 164(1-4):147–163
Davvaz B (2008) A short note on algebraic T-rough sets. Inf Sci 178:3247–3252
Davvaz B, Khan A, Sarmin NH, Khan H (2013) More general forms of interval valued fuzzy filters of ordered semigroups. Int J Fuzzy Syst 15(2):110–126
Dubois D, Prade H (1990) Rough fuzzy sets and fuzzy rough sets. Int J Gen Syst 17:191–209
Gehrke M, Walker E (1992) On the structure of rough sets. Bull Polish Acad Sci Math 40:235–245
Iwinski J (1987) Algebraic approach to rough sets. Bull Polish Acad Sci Math 35:673–683
Jiang H, Zhan J, Chen D (2018) Covering based variable precision (I,T)-fuzzy rough sets with applications to multi-attribute decision-making. IEEE Trans Fuzzy Syst. https://doi.org/10.1109/TFUZZ.2018.2883023
Jun YB (2008) Soft BCK/BCI-algebras. Comput Math Appl 56:1408–1413
Jun YB, Park CH (2008) Applications of soft sets in ideal theory of BCK/BCI-algebras. Inf Sci 178:2466–2475
Kanwal RS, Shabir M (2018) Approximation of ideals in semigroups by soft relations. J Intell Fuzzy Syst 35(3):3895–3908
Kanwal RS, Shabir M (2019) An approach to approximate a fuzzy set by soft binary relation and corresponding decision making (submitted)
Kanwal RS, Shabir M. Approximation of soft ideals by soft relations in semigroups (submitted)
Kanwal RS, Shabir M, Ali MI. Reduction of an information system (submitted)
Kazanci O, Yamak S (2008) Generalized fuzzy bi-ideals of semigroup. Soft Comput 12:1119–1124
Kehayopulu N, Tsingelis M (1999) A note on fuzzy sets in semigroups. Sci Math 2:411–413
Kehayopulu N, Tsingelis M (2002) Fuzzy sets in ordered groupoids. Semigroup Forum 65:128–132
Khan A, Jun YB, Sarmin NH, Khan FM (2018) Ordered semigroups characterized by \((\in,\in \vee qk)\)-fuzzy generalized bi-ideals. Neural Comput Appl 21(1):121–132
Khan A, Sarmin NH, Davvaz B, Khan FM (2012) New types of fuzzy bi-ideals in ordered semigroups. Neural Comput Appl 21(1):295–305
Klir R, Yuan B (1995) Fuzzy sets and fuzzy logic: theory and applications. Prentice-Hall PTR, Upper Saddle River
Kuroki N (1979) Fuzzy bi-ideals in semigroups. Commentarii Mathematici Universitatis Sancti Pauli 28:17–21
Kuroki N (1981) On fuzzy ideals and fuzzy bi-ideals in semigroups. Fuzzy Sets Syst 5:203–215
Kuroki N (1991) On fuzzy semigroups. Inf Sci 53:203–236
Kuroki N (1993) Fuzzy semiprime quasi-ideals in semigroups. Inf Sci 75:201–211
Kuroki N (1997) Rough ideals in semigroups. Inf Sci 100:139–163
Liu G, Zhu W (2008) The algebraic structures of generalized rough set theory. Inf Sci 178:4105–4113
Ma X, Zhan J, Jun YB (2009) On \((\in,\in \vee q)-\)fuzzy filters of \( R_{0}\)-algebras. Math Logic Quart 55:493–508
Ma X, Liu Q, Zhan J (2017) A survey of decision making methods based on certain hybrid soft set models. Artif Intell Rev 47:507–530
Ma X, Zhan J, Ali MI, Mehmood N (2018) A survey of decision making methods based on two classes of hybrid soft set models. Artif Intell Rev 49(4):511–529
Mahmood T, Ali MI, Hussain A (2018) Generalized roughness in fuzzy filters and fuzzy ideals with thresholds in ordered semigroups. Comput Appl Math 37:5013–5033
Molodtsov D (1999) Soft set theory—first results. Comput Math Appl 37:19–31
Molodtsov D (2004) The theory of soft sets. URSS Publishers, Moscow (in Russian)
Pawlak Z (1982) Rough sets. Int J Comput Inf Sci 11:341–356
Pawlak Z (1984) Rough classification. Int J Man Mach Stud 20:469–483
Pawlak Z (1985) Rough sets and fuzzy sets. Fuzzy Sets Syst 17:99–102
Pawlak Z (1987) Rough logic. Bull Polish Acad Sci Tech Sci 35:253–258
Pawlak Z (1991) Rough sets: theoretical aspects of reasoning about data. Kluwer Academic Publishers, Dordrecht
Pawlak Z (1992) Rough sets: a new approach to vagueness. In: Zadeh LA, Kacprzyk J (eds) Fuzzy logic for the management of uncertainty. Wiley, New York, pp 105–118
Pawlak Z (1994) Hard and soft sets. In: Ziarko WP (ed) Rough sets, fuzzy sets and knowledge discovery. Springer, London, pp 130–135
Pawlak Z, Skowron A (1994) Rough membership functions. In: Zadeh A, Kacprzyk J (eds) Fuzzy logic for the management of uncertainty. Wiley, New York, pp 251–271
Pawlak Z, Skowron A (2007a) Rudiments of rough sets. Inf Sci 177:3–27
Pawlak Z, Skowron A (2007b) Rough sets: some extensions. Inf Sci 177:28–40
Pawlak Z, Wong SKM, Ziarko W (1988) Rough sets: probabilistic versus deterministic approach. Int J Man Mach Stud 29:81–95
Pomykala J, Pomykala JA (1988) The Stone algebra of rough sets. Bull Polish Acad Sci Math 36:495–508
Qurashi SM, Shabir M (2018a) Roughness in Q-module. J Intell Fuzzy Syst 2018:1–14
Qurashi SM, Shabir M (2018b) Generalized rough fuzzy ideals in quantales. Discr Dyn Nat Soc Article ID 1085201
Qurashi SM, Shabir M (2018c) Generalized approximations of \((\in ,\in \vee q)\)-fuzzy ideals in quantales. Comput Appl Math 37:6821–6837
Rosenfeld A (1971) Fuzzy groups. J Math Anal Appl 35:512–517
Roy AR, Maji PK (2007) A fuzzy soft set theoretic approach to decision making problems. J Comput Appl Math 203:412–418
Shabir M, Irshad S (2013) Roughness in ordered semigroups. World Appl Sci J 22:84–105
Shabir M, Nawaz Y, Aslam M (2011) Semigroups characterized by the properties of their fuzzy ideals with thresholds. World Appl Sci J 14:1851–1865
Shabir M, Jun YB, Nawaz Y (2010) Semigroups characterized by \( (\in ,\in \vee q_{k})\)-fuzzy ideals. Comput Math Appl 60:1473–1493
Yang CF (2011) Fuzzy soft semigroups and fuzzy soft ideals. Comput Math Appl 61:255–261
Yao YY (1993) Interval-set algebra for qualitative knowledge representation. In: Proceedings of the 5th international conference on computing and information, pp 370–375
Yao YY (1996) Two views of the theory of rough sets in finite universes. Int J Approx Reason 15:291–317
Yuan X, Zhang C, Ren Y (2003) Generalized fuzzy groups and many-valued implications. Fuzzy Sets Syst 138:205–211
Zadeh LA (1965) Fuzzy sets information and control 8:338–353
Zhan J, Alcantud JCR (2018) A novel type of soft rough covering and its application to multicriteria group decision making. Artif Intell Rev. https://doi.org/10.1007/s10462-018-9617-3
Zhan J, Alcantud JCR (2018) A survey of parameter reduction of soft sets and corresponding algorithms. Artif Intell Rev. https://doi.org/10.1007/s10462-017-9592-0
Zhan J, Wang Q (2018) Certain types of soft coverings based rough sets with applications. Int J Mach Learn Cybern. https://doi.org/10.1007/s13042-018-0785-x
Zhan J, Xu W (2018) Two types of coverings based multigranulation rough fuzzy sets and applications to decision making. Artif Intell Rev. https://doi.org/10.1007/s10462-018-9649-8
Zhan J, Zhu K (2017) A novel soft rough fuzzy set: Z-soft rough fuzzy ideals of hemirings and corresponding decision making. Soft Comput 21:1923–1936
Zhan J, Ali MI, Mehmood N (2017) On a novel uncertain soft set model: Z-soft fuzzy rough set model and corresponding decision making methods. Appl Soft Comput 56:446–457
Zhan J, Liu Q, Herawan T (2017) A novel soft rough set: soft rough hemirings and its multicriteria group decision making. Appl Soft Comput 54:393–402
Zhan J, Sun B, Alcantud JCR (2019) Covering based multigranulation (I, T)-fuzzy rough set models and applications in multi-attribute group decision-making. Inf Sci 476:290–318
Zhang L, Zhan J (2018) Fuzzy soft \(\beta \)-covering based fuzzy rough sets and corresponding decision-making applications. Int J Mach Learn Cybern. https://doi.org/10.1007/s13042-018-0828-3
Zhang L, Zhan J, Alcantud JCR (2018) Novel classes of fuzzy soft \( \beta \)-coverings-based fuzzy rough sets with applications to multi-criteria fuzzy group decision making. Soft Comput. https://doi.org/10.1007/s00500-018-3470-9
Zhang L, Zhan J, Xu ZX (2019) Covering-based generalized IF rough sets with applications to multi-attribute decision-making. Inf Sci 478:275–302
Zhu W (2009) Relationship between generalized rough sets based on binary relation and covering. Inf Sci 179:210–225
Author information
Authors and Affiliations
Corresponding author
Additional information
Communicated by Anibal Tavares de Azevedo.
Publisher's Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Rights and permissions
About this article
Cite this article
Kanwal, R.S., Shabir, M. Rough approximation of a fuzzy set in semigroups based on soft relations. Comp. Appl. Math. 38, 89 (2019). https://doi.org/10.1007/s40314-019-0851-3
Received:
Revised:
Accepted:
Published:
DOI: https://doi.org/10.1007/s40314-019-0851-3