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Alexander P. Sostak

Alexandr Sostak – Alexander Shostak – Alexander P. Šostak

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unicode name: Alexander P. Šostak
affiliation: University of Latvia, Department of Mathematics

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Journal Articles

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2023
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Juan-José Miñana, Alexander P. Sostak, Óscar Valero:
On metrization of fuzzy metrics and application to fixed point theory. Fuzzy Sets Syst. 468: 108625 (2023)
[j19]
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Alexander P. Sostak, Ingrida Uljane:
Powerset operators induced by fuzzy relations as a basis for fuzzification of various mathematical structures. Int. J. Approx. Reason. 155: 17-39 (2023)
2021
[j18]
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Alexander P. Sostak, Ingrida Uljane, Maris Krastins:
Gradation of Fuzzy Preconcept Lattices. Axioms 10(1): 41 (2021)
2020
[j17]
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  - journals/axioms/GrigorenkoMSV20
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Olga Grigorenko, Juan-José Miñana, Alexandr Sostak, Óscar Valero:
On t-Conorm Based Fuzzy (Pseudo)metrics. Axioms 9(3): 78 (2020)
[j16]
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M. K. Dubey, S. P. Tiwari, Alexander P. Sostak:
Categories of quantale-valued fuzzy automata: determinization and minimization. J. Appl. Math. Comput. 63(1-2): 771-785 (2020)
2018
[j15]
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Alexander P. Sostak:
George-Veeramani Fuzzy Metrics Revised. Axioms 7(3): 60 (2018)
[j14]
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Sang-Eon Han, Alexander P. Sostak:
On the measure of M-rough approximation of L-fuzzy sets. Soft Comput. 22(12): 3843-3855 (2018)
2016
[j13]
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Raivis Bets, Alexander P. Sostak:
Fragmentary Fuzzy Pseudometrics: Basics of the Theory and Applications in Combinatorics on Words. Balt. J. Mod. Comput. 4(4) (2016)
[j12]
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Alexander P. Sostak, Ingrida Uljane:
L-valued bornologies on powersets. Fuzzy Sets Syst. 294: 93-104 (2016)
[j11]
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Juan-José Miñana, Alexandr Sostak:
Fuzzifying topology induced by a strong fuzzy metric. Fuzzy Sets Syst. 300: 24-39 (2016)
2014
[j10]
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Sang-Eon Han, In-Soo Kim, Alexander P. Sostak:
On approximate-type systems generated by L-relations. Inf. Sci. 281: 8-20 (2014)
2013
[j9]
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Radko Mesiar, Martin Stepnicka, Alexander P. Sostak:
Fuzzy sets: Theory and applications (FSTA 2012). Fuzzy Sets Syst. 232: 1-2 (2013)
[j8]
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Dace Cimoka, Alexander P. Sostak:
L-fuzzy syntopogenous structures, Part I: Fundamentals and application to L-fuzzy topologies, L-fuzzy proximities and L-fuzzy uniformities. Fuzzy Sets Syst. 232: 74-97 (2013)
2010
[j7]
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Javier Gutiérrez García, Tomasz Kubiak, Alexander P. Sostak:
Ideal-valued topological structures. Fuzzy Sets Syst. 161(18): 2380-2388 (2010)
[j6]
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Alexander P. Sostak:
Towards the theory of M-approcimate systems: Fundamentals and examples. Fuzzy Sets Syst. 161(18): 2440-2461 (2010)
[j5]
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Ferdinand Chovanec, Olga Nánásiová, Alexander P. Sostak:
Preface of the guest editors. Soft Comput. 14(10): 1025-1026 (2010)
2005
[j4]
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Svetlana V. Asmuss, Alexander P. Sostak:
On central algorithms of approximation under fuzzy information. Fuzzy Sets Syst. 155(1): 150-163 (2005)
1999
[j3]
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  - journals/fss/KalinaS99
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Martin Kalina, Alexander P. Sostak:
Fuzzy analysis and related topics. Fuzzy Sets Syst. 105(2): 199-200 (1999)
[j2]
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Svetlana V. Asmuss, Alexander P. Sostak:
Extremal problems of approximation theory in fuzzy context. Fuzzy Sets Syst. 105(2): 249-257 (1999)
1992
[j1]
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Veniamin Shteinbuk, Alexander P. Sostak:
On endomorphism semigroups of a fuzzily structured set. Kybernetika 28(7): 54-57 (1992)

Conference and Workshop Papers

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2023
[c20]
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Alexander P. Sostak, Maris Krastins, Ingrida Uljane:
Conceptuality Degree of Oriented Crisply Generated Fuzzy Preconcepts. EUSFLAT/AGOP 2023: 86-98
2022
[c19]
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Alexander P. Sostak, Maris Krastins, Ingrida Uljane:
Graded concept lattices in fuzzy rough set theory. CLA 2022: 19-33
[c18]
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Raivis Bets, Alexander P. Sostak, Emils Mikelis Mikelsons:
Parameterized Metrics and Their Applications in Word Combinatorics. IPMU (1) 2022: 270-281
2021
[c17]
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Maris Krastins, Ingrida Uljane, Alexander Shostak:
Application of Graded Fuzzy Preconcept Lattices in Risk Analysis. IJCCI 2021: 177-184
2020
[c16]
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Alexander P. Sostak, Ingrida Uljane, Patrik Eklund:
Fuzzy Relational Mathematical Morphology: Erosion and Dilation. IPMU (3) 2020: 712-725
2019
[c15]
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Alexander P. Sostak, Ingrida Uljane:
Some remarks on topological structures in the context of fuzzy relational mathematical morphology. EUSFLAT Conf. 2019
[c14]
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Alexander P. Sostak, Ingrida Uljane, Aleksandrs Elkins:
Many-level fuzzy rough approximation spaces induced by many-level fuzzy preorders and the related ditopological structures. EUSFLAT Conf. 2019
2017
[c13]
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Alexander P. Sostak, Raivis Bets:
Fuzzy φ-pseudometrics and Fuzzy φ-pseudometric Spaces. EUSFLAT/IWIFSGN (3) 2017: 328-340
[c12]
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Ingrida Uljane, Alexander P. Sostak:
M-bornologies on L-valued Sets. EUSFLAT/IWIFSGN (3) 2017: 450-462
2016
[c11]
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Aleksandrs Elkins, Alexander P. Sostak, Ingrida Uljane:
On a Category of Extensional Fuzzy Rough Approximation L-valued Spaces. IPMU (2) 2016: 48-60
2015
[c10]
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Dikran Dikranjan, Alexander P. Sostak:
On two categories of many valued relations. IFSA-EUSFLAT 2015
2014
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Alexander P. Sostak:
Measure of Roughness for Rough Approximation of Fuzzy Sets and Its Topological Interpretation. IJCCI (FCTA) 2014: 61-67
[c8]
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Irina Perfilieva, Alexandr Sostak:
Fuzzy Function and the Generalized Extension Principle. IJCCI (FCTA) 2014: 169-174
[c7]
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Sang-Eon Han, Alexander P. Sostak:
M-valued Measure of Roughness for Approximation of L-fuzzy Sets and Its Topological Interpretation. IJCCI (Selected Papers) 2014: 251-266
[c6]
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Aleksandrs Elkins, Sang-Eon Han, Alexander P. Sostak:
Variable-Range Approximate Systems Induced by Many-Valued L-Relations. IPMU (3) 2014: 41-50
2013
[c5]
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Alexander P. Sostak, Ingrida Uljane:
Bornological structures in the context of L-fuzzy sets. EUSFLAT Conf. 2013
2011
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  - conf/eusflat/VarolSA11
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Banu Pazar Varol, Alexander Shostak, Halis Aygün:
Categories Related to Topology Viewed as Soft Sets. EUSFLAT Conf. 2011: 883-890
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Svetlana V. Asmuss, Alexander P. Sostak:
On spline methods of approximation under L-fuzzy information. FUZZ-IEEE 2011: 1610-1614
2009
[c2]
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Alexander P. Sostak:
On M-Approximative Operators and M-Approximative Systems. IFSA/EUSFLAT Conf. 2009: 1606-1611
2007
[c1]
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Ingrida Uljane, Alexander P. Sostak:
On L-valued Equalites on the L-powersets of Many-valued Sets. EUSFLAT Conf. (2) 2007: 387-393

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2015
[p1]
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Irina Perfilieva, Alexandr Sostak:
From Lattice Valued Theories to Lattice Valued Analysis. Towards the Future of Fuzzy Logic 2015: 167-182

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