Contractions of Closure Systems
This essay shows that some recent work by George Weaver can be reformulated in an especially perspicuous way within the theory of closure systems. Closure theoretic generalizations of some theorems of Robert Goldblatt are presented. And, more generally, the relation between closure systems and the deducibility relations of Goldblatt is explored.
Permanent link to this document: http://projecteuclid.org/euclid.ndjfl/1040609298
Mathematical Reviews number (MathSciNet): MR1271702
Digital Object Identifier: doi:10.1305/ndjfl/1040609298
Zentralblatt MATH identifier: 0804.06004