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Number theory is a branch of pure mathematics devoted primarily to the study of the integers and arithmetic functions.German mathematician Carl Friedrich Gauss (1777–1855) said, "Mathematics is the queen of the sciences—and number theory is the queen of mathematics."
5 A: Resembles an upside-down V. Also said to equal 500. 6 ↅ Either from a ligature of VI, or from digamma (ϛ), the Greek numeral 6 (sometimes conflated with the στ ligature). [48] 7 S, Z: Presumed abbreviation of septem, Latin for 7. 9.5 X̷: Scribal abbreviation, an x with a slash through it. Likewise, IX̷ represented 8.5 11 O