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The file contains research on the ancient theory of Unity in the light of the Circular Abacus (ch1 provisional description of circular abacal calculation…; ch.2 ibn ezra’s elucidation of theory and practice of circular abacal calculation.; Ch. 3 evidence of the use of circular abacal calculation by greek and latin authors…; Ch. 4 aristotle’s problema XV on mediterranean calculation during 4th cent.BC)