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O’Connor, J J; Robertson, E F. “A history of Zero”. O’Connor, Robertson, J.J., E.F. Oxford: Oxford University Press. Oxford University Press. p. Princeton University Press. pp. Ptolemy’s Almagest. Translated by Toomer, G. J. Princeton University Press. Metaphysics Research Lab, Stanford University. The Stanford Encyclopedia of Philosophy (Winter 2019 ed.). Nieder, Andreas (19 November 2019). A…