Mostafa A. Abdelkader
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Mostafa A. Abdelkader is a mathematician from Alexandria, Egypt, who has propounded a concave hollow Earth theory and has developed adjustments to the laws of physics that take into account gravitation, optics, and other physical phenomena. Abdelkader has authored several scholarly papers in which he worked out a detailed mapping of the concave earth model. See M. Abdelkader, "A Geocosmos: Mapping Outer Space Into a Hollow Earth," 6 Speculations in Science & Technology 81-89 (1983). Abstracts of two of Abdelkader's papers also appeared in Notices of the American Mathematical Society (Oct. 1981 and Feb. 1982).