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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."
VI.1789" and "VI.4.1789" both refer unambiguously to 4 June 1789. Business hours table on a shop window in Vilnius , Lithuania. Roman numerals are sometimes used to represent the days of the week in hours-of-operation signs displayed in windows or on doors of businesses, [ 76 ] and also sometimes in railway and bus timetables.