On D. Gross' criticism of S. Eddington and an exact calculation of αo¯≃137

While Sir Arthur Stanley Eddington attempts to derive αo¯≃137 mathematically may be considered to be a stretch, as correctly noted by Nobel laureate David Gross, in the meantime such a theoretical derivation is possible and feasible. In the present work, we show that the inverse electromagnetic fine structure constant may be derived in various ways using a combination of the Green, Shwarz, Witten and Gross string theory and the 't Hooft-Susskind and Maldacena holographic principles.