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automorphism  

Definition

  • In mathematics, an automorphism is an isomorphism from a mathematical object to itself. It is, in some sense, a symmetry of the object, and a way of mapping the object to itself while preserving all of its structure. The set of all automorphisms of an object forms a group, called the automorphism group. It is, loosely speaking, the symmetry group of the object.
    (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Automorphism)

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http://data.loterre.fr/ark:/67375/PSR-H2Z50PHN-7

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