Existential Horn sentences

Lyndon, R. C.

doi:10.1090/S0002-9939-1959-0115914-6

Proceedings of the American Mathematical Society

Published by the American Mathematical Society since 1950, Proceedings of the American Mathematical Society is devoted to shorter research articles in all areas of pure and applied mathematics.

ISSN 1088-6826 (online) ISSN 0002-9939 (print)

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Existential Horn sentences
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by R. C. Lyndon PDF

Proc. Amer. Math. Soc. 10 (1959), 994-998 Request permission

References

C. C. Chang and Anne C. Morel, On closure under direct product, J. Symbolic Logic 23 (1958), 149–154. MR 104606, DOI 10.2307/2964395
Alfred Horn, On sentences which are true of direct unions of algebras, J. Symbolic Logic 16 (1951), 14–21. MR 40233, DOI 10.2307/2268661
Roger C. Lyndon, An interpolation theorem in the predicate calculus, Pacific J. Math. 9 (1959), 129–142. MR 106825
J. C. C. McKinsey, The decision problem for some classes of sentences without quantifiers, J. Symbolic Logic 8 (1943), 61–76. MR 8991, DOI 10.2307/2268172