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Mostafa A. Abdelkader is a mathematician from Alexandria, Egypt, who has proposed a concave Earth theory, adjusting 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," six 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).
