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Keywords:
contractions; Lie algebras; affine algebraic groups; affine group schemes
contractions; Lie algebras; affine algebraic groups; affine group schemes
Summary:
Degenerations, contractions and deformations of various algebraic structures play an important role in mathematics and physics. There are many different definitions and special cases of these notions. We try to give a general definition which unifies these notions and shows the connections among them. Here we focus on contractions of Lie algebras and algebraic groups.
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