A hierarchy of formulas in set theory/

Levy, Azriel.

A hierarchy of formulas in set theory/ by Azriel Lévy. - Providence, R.I.: American Mathematical Society, 1965. - 76 p.: 26 cm. - Memoirs of the American Mathematical Society; no. 57 .

Cover title.

Bibliography: p. 74-76.


Set theory.
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