Azriel Lévy. On a spectrum of set theories. Illinois journal of mathematics, vol. 4 (1960), pp. 413–424. - A. Lévy and R. Vaught. Principles of partial reflection in the set theories of Zermelo and Ackermann. Pacific journal of mathematics, vol. 11 (1961), pp. 1045–1062. - Azriel Lévy. On the principles of reflection in axiomatic set theory. Logic, methodology and philosophy of science, Proceedings of the 1960 International Congress, edited by Ernest Nagel, Patrick Suppes, and Alfred Tarski, Stanford University Press, Stanford, Calif., 1962, pp. 87–93.

1970 ◽  
Vol 35 (3) ◽  
pp. 473-473
Author(s):  
J. R. Shoenfield

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