# Lattice isomorphisms between certain sublattices of continuous functions

## TL;DR

This paper establishes a correspondence between lattice isomorphisms of certain sublattices of continuous functions and homeomorphisms of the underlying spaces, with explicit representations in the case of Lipschitz functions.

## Contribution

It extends the understanding of lattice isomorphisms to sublattices of continuous functions, showing they induce homeomorphisms and providing explicit forms of these isomorphisms.

## Key findings

- Lattice isomorphisms induce homeomorphisms between spaces.
- Representation of isomorphisms via pointwise transformations.
- Results apply to Lipschitz functions with full space coverage.

## Abstract

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 $\varphi : A \longrightarrow B$ induces a homeomorphism $\mu: Y \longrightarrow X$. If, furthermore, $A$ and $B$ are closed under the multiplication, then $\varphi$ has a representation $\varphi(f)(y)=m_y(f(\mu(y)))$, $f\in A$, for all points $y$ in a dense $G_\delta$ 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 $Y$.