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Familiar things happen, and mankind does not bother about them. It requires a very unusual mind to undertake the analysis of the obvious.
Science and the Modern World.
Leonhard Euler's Calculus of Variations
This is the title page of the first textbook in the calculus of variations, the Method of Finding Curved Lines that Show some Property of Maximum or Minimum, by Leonhard Euler (1707-1783). The book was published in 1744.