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Answer: The term "function" was introduced by Gottfried Wilhelm Leibniz (1646-1716) almost fifty years after the publication of Geometry. The idea of a function was further formalized by Leonhard Euler (pronounced "oiler" 1707-1783) who introduced the notation for a function, y = f(x).
Some characteristics of agrarian societies were:
• rapid technological advances
• extra food during winter
• less leisure time
• freedom to work different jobs
• depletion of the soil
