Finite concrete logics: their structure and measures on them
A concrete logic is a family \(L\) of subsets of a set \(X\) such that (1) \(X \in L\), (2) \(X \setminus A \in L\) for every \(A \in L\), (3) \(A \cup B \in L\) whenever \(A,B \in L\) are disjoint. The authors give a survey of results on finite concrete logics. They concentrate their attention on duality and on extending measures and signed measures.
scientific article; zbMATH DE number 1196977