Definition:Finite Meet Preserving Mapping
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Definition
Let $L_1 = \struct{S_1, \wedge_1, \preceq_1}$ and $L_2 = \struct{S_2, \wedge_2, \preceq_2}$ be meet semilattices with greatest elements $\top_1$ and $\top_2$ respectively.
Let $\phi: S_1 \to S_2$ be a mapping between the underlying sets of $L_1$ and $L_2$.
Then:
- $\phi$ is finite meet preserving, denoted $\phi:L_1 \to L_2$
- $\forall$ finite $A \subseteq S_1 : \map \phi {\inf A} = \inf \set{\map \phi a : a \in A}$
Also see
Sources
- 1982: Peter T. Johnstone: Stone Spaces: Chapter II: Introduction to Locales, $\S1.1$ Definition (a)