A topological characterisation of endomorphism monoids of countable structures
A topological characterisation of endomorphism monoids of countable structures
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可数结构自同态幺半群的拓扑表征
DOI:
10.1007/s00012-017-0427-2
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发表时间:
2017
影响因子:
0.6
通讯作者:
Friedrich Martin Schneider
中科院分区:
文献类型:
--
作者:
Manuel Bodirsky;Friedrich Martin Schneider
A topological monoid is isomorphic to an endomorphism monoid of a countable structure if and only if it is separable and has a compatible complete ultrametric such that composition from the left is non-expansive. We also give a topological characterisation of those topological monoids that are isomorphic to endomorphism monoids of countable-categorical structures. Finally, we present analogous characterisations for polymorphism clones of countable structures and for polymorphism clones of countable-categorical structures.
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