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arXiv 1907.08786math.FA
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某些连续函数子格之间的格同构

Lattice isomorphisms between certain sublattices of continuous functions

Vahid Ehsani, Fereshteh Sady

摘要:

设$C(X,I)$是紧致Hausdorff空间$X$上所有值在单位区间$I=[0,1]$内的连续函数的格。我们证明了,对于紧Hausdorff空间$X$和$Y$和(不一定包含常数)子格$A$和$B$的$C(X,I)$和$C(Y,I)$,分别满足一定的分离性质,任何格同构$φ: A \longrightarrow B$诱导同胚$μ: Y \longrightarrow X$。此外,如果$A$和$B$在乘法下闭合,则对于$Y$的稠密$Y_0$子集$G_δ$中的所有点$y$,$φ$具有表示$φ(f)(y)=m_y(f(μ(y)))$,$f\in A$,其中每个$m_y$是$I$上的严格递增连续双射。特别地,对于$X$和$Y$是度量空间并且$A$和$B$是具有$I$中的值的所有Lipschitz函数的格的情况,集合$Y_0$是整个$Y$。

英文摘要:

Let $C(X,I)$ be the lattice of all continuous functions on a compact Hausdorff space $X$ with values in the unit interval $I=[0,1]$. We show that for compact Hausdorff spaces $X$ and $Y$ and (not necessarily contain constants) sublattices $A$ and $B$ of $C(X,I)$ and $C(Y,I)$, respectively, which satisfy a certain separation property, any lattice isomorphism $φ: A \longrightarrow B$ induces a homeomorphism $μ: Y \longrightarrow X$. If, furthermore, $A$ and $B$ are closed under the multiplication, then $φ$ has a representation $φ(f)(y)=m_y(f(μ(y)))$, $f\in A$, for all points $y$ in a dense $G_δ$ subset $Y_0$ of $Y$, where each $m_y$ is a strictly increasing continuous bijection on $I$. In particular, for the case where $X$ and $Y$ are metric spaces and $A$ and $B$ are the lattices of all Lipschitz functions with values in $I$, the set $Y_0$ is the whole of $Y$.

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