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- Hellenic Mathematical Society
- American Mathematical Society
- California Alumni Association
- American Association for the Advancement of Science
- Sigma Xi , The Scientific Research Society
- The New York Academy of Sciences
- Academy of Arts and Sciences of the Americas
- International Academy of Creative Endeavors (IACE), Russia
- Royal Astronomical Society, London, UK
- The Marquis Who’s Who Publ. Board in Sciences and Engineering
- International Society of Difference Equations (ISDE)
- Research Group in Mathematical Inequalities and Applications (RGMIA) , Victoria University , Australia
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