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Between homogeneity and rigidity
Grebík, Jan ; Kubiš, Wieslaw (vedoucí práce) ; Šaroch, Jan (oponent)
We study uncountable variants of structures that have the extension property for embeddings with respect to some Fraïssé class C. We call such structures Fraïssé-like structures. These structures are usually not uniquely determined. It was known that under the existence of Katětov functor for C there are Fraïssé-like structures of arbitrary big cardinality (density) with rich group of automorphisms. We show that in case where C is a class of all finite graphs or all finite metric spaces we may find Fraïssé-like structure of cardinality (density) ℵ1 with trivial group of automorphisms. We give an answer to a recent question from W. Kubi's, D. Mašulovi'c, Katětov functors, to appear in Applied Categorical Structures by constructing a Fraïssé class without a Katětov functor. 1

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