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Spencer Operator and Applications: From Continuum Mechanics to Mathematical Physics"
From Lie groups to Lie pseudogroupsEvariste Galois (1811-1832) introduced the word "group" for the first time in 1830.Then the group concept slowly passed from algebra (groups of permutations) to geometry (groups of transformations).It is only in 1880 that Sophus Lie (1842-1899) studied the groups of transformations depending on a finite …