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- W2900655612 abstract "We present three examples of countable homogeneous structures (also called Fraisse limits) whose automorphism groups are not universal, namely, fail to contain isomorphic copies of all automorphism groups of their substructures. Our first example is a particular case of a rather general construction on Fraisse classes, which we call diversification, leading to automorphism groups containing copies of all finite groups. Our second example is a special case of another general construction on Fraisse classes, the mixed sums, leading to a Fraisse class with all finite symmetric groups appearing as automorphism groups and at the same time with a torsion-free automorphism group of its Fraisse limit. Our last example is a Fraisse class of finite models with arbitrarily large finite abelian automorphism groups, such that the automorphism group of its Fraisse limit is again torsion-free." @default.
- W2900655612 created "2018-11-29" @default.
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- W2900655612 date "2018-11-23" @default.
- W2900655612 modified "2023-09-27" @default.
- W2900655612 title "Homogeneous structures with non-universal automorphism groups" @default.
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