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arXiv 2103.00563math.LO
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强强联合

The strong amalgamation property into union

Paolo Lipparini

摘要:

我们考虑的情况下,其中一些类的结构具有强合并属性(SAP)与进一步的要求,合并结构可以接管集合理论工会(图像)的结构域合并。我们称之为SAPU。SAPU相对于SAP的主要优点是,有许多保持定理表明,我们可以用SAPU合并不同的理论,仍然可以用SAPU得到一个理论,因此可以用SAP。特别是,我们得到SAPU的各种理论与许多二元关系,每一个关系满足任何一组属性中选择的传递性,自反性,对称性,反自反性,反对称。我们也可以添加一元运算,可能满足某些粗糙性、保序性和闭包条件。SAPU并不局限于关系理论:在泛代数中定义最常见的Maltsev条件的变种都有SAPU。其他的例子包括有界的直向胚,序代数和各种推广。

英文摘要:

We consider the situation in which some class of structures has the Strong Amalgamation Property (SAP) with the further requirement that the amalgamating structure can be taken over the set theoretical union of (the images of) the domains of the structures to be amalgamated. We call this property SAPU. The main advantage of SAPU over SAP is that there are many preservation theorems showing that we can merge different theories with SAPU still obtaining a theory with SAPU, hence with SAP. In particular, we get SAPU for various theories with many binary relations, each relation satisfying any set of properties chosen among transitivity, reflexivity, symmetry, antireflexivity, antisymmetry. We may also add unary operations, possibly satisfying some coarseness, isotonicity and closure conditions. SAPU is not limited to relational theories: the varieties defining the most usual Maltsev conditions in universal algebra have SAPU. Other examples include bounded directoids, order algebras and various generalization.

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