Elementary extensions of models of set theory

A partition calculus in set theory

Péter L. Erdős, R. Rado · Bulletin of the American Mathematical Society · 1956 · 439 citations · Full text

Natural Sciences, Mathematics, Discrete Mathematics +10

Arithmetical extensions of relational systems

Alfred Tarski, Robert L. Vaught · French digital mathematics library (Numdam) · 1958 · 296 citations

Computing, Computer Science, Mathematics +14

Natural models of set theories

Richard Montague, Robert L. Vaught · Fundamenta Mathematicae · 1959 · 66 citations

Natural Sciences, Mathematics, Philosophy Of Mathematics +9

Limit ultrapowers

H. Jerome Keisler · Transactions of the American Mathematical Society · 1963 · 59 citations

A note on the two cardinal problem

C. C. Chang · Proceedings of the American Mathematical Society · 1965 · 38 citations

Natural Sciences, Mathematics, Logic +5