On Arithmetical Classes Not Closed Under Direct Union

DOI10.2307/2032943zbMath0068.24701OpenAlexW4229626820MaRDI QIDQ3230364

Kurt Bing

Publication date: 1955

Full work available at URL: https://doi.org/10.2307/2032943

zbMATH Keywords

Philosophy and foundations of mathematics

Related Items

Algebras defined by equations ⋮ Reduced Products and Horn Classes ⋮ Properties preserved under algebraic constructions ⋮ Über die Axiome Produkt-Abgeschlossener Arithmetischer Klassen ⋮ \(\Sigma\)-free models

Cites Work

• On sentences which are true of direct unions of algebras
• The decision problem for some classes of sentences without quantifiers