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arXiv 2301.12482math.LO
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可比二元关系与合并性质

Comparable binary relations and the amalgamation property

Paolo Lipparini

摘要:

当第一个关系比第二个关系粗糙,并且每个关系满足从以下列表中选择的一组性质:传递性,自反性,对称性,反自反性和反对称性时,两个二元关系的理论具有强融合性质。当我们添加保持所有关系的一元运算族时,保持合并属性。作为结果,我们得到了有限结构类的Fra 'ıssé极限的存在性.对于一般的可比性条件,当考虑到三个或更多的二元关系时,或者当我们添加一个仅保留一个关系的操作时,结果失败。

英文摘要:

The theory of two binary relations has the strong amalgamation property when the first relation is assumed to be coarser than the second relation, and each relation satisfies a chosen set of properties from the following list: transitivity, reflexivity, symmetry, antireflexivity and antisymmetry. The amalgamation property is maintained when we add families of unary operations preserving all the relations. As a consequence, we get the existence of Fra\"ıssé limits for classes of finite structures. The results fail, for general comparability conditions, when three or more binary relations are taken into account, or when we add an operation preserving just one relation.

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