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arXiv 1202.4480math.GN
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关于自由拓扑代数的闭嵌入

On closed embeddings of free topological algebras

T. Banakh, O. Hryniv

摘要:

设$\mathcal K$是具有连续签名$\mathcal K$的完全正则泛拓扑代数的完全拟簇(这意味着$\mathcal K$在取子代数、笛卡儿积下是闭的,并且包括与$\mathcal K$的成员代数同构的所有完全正则拓扑$\mathcal E$ -代数).对于由$F(X)$构成的拓扑空间$X$,我们把$X$上的自由泛$\mathcal E$ -代数记为类$\mathcal K$ .利用Hartman-Mycielski构造的一些扩张性质,我们证明了对于可度量化(更一般地说,可分层)空间$Y$的闭子空间$X$,相应的自由泛代数之间的诱导同态$F(X)\to F(Y)$是闭拓扑嵌入.这推广了V.Uspenskii关于自由拓扑群嵌入的一个结果.

英文摘要:

Let $\mathcal K$ be a complete quasivariety of completely regular universal topological algebras of continuous signature $\mathcal E$ (which means that $\mathcal K$ is closed under taking subalgebras, Cartesian products, and includes all completely regular topological $\mathcal E$-algebras algebraically isomorphic to members of $\mathcal K$). For a topological space $X$ by $F(X)$ we denote the free universal $\mathcal E$-algebra over $X$ in the class $\mathcal K$. Using some extension properties of the Hartman-Mycielski construction we prove that for a closed subspace $X$ of a metrizable (more generally, stratifiable) space $Y$ the induced homomorphism $F(X)\to F(Y)$ between the respective free universal algebras is a closed topological embedding. This generalizes one result of V.Uspenskii concerning embeddings of free topological groups.

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