TABLE OF CONTENTS
Foreword v
Sets constructible using LKK
By C. C. CHANG 1
Comments on the foundations of set theory
By PAUL J. COHEN 9
Unsolved problems in set theory
By P. ERDOS and A. HAJNAL 17
A more explicit set theory
By HARVEY FRIEDMAN 49
Sets, semisets, models
By PETR HAJEK 67
The Boolean prime ideal theorem does not imply the axiom of choice
By J. D. HALPERN and A. LEVY 83
On models for set theory without AC
By THOMAS JECH 135
Primitive recursive set functions
By RONALD B. JENSEN and CAROL KARP 143
End extensions of models of set theory
By H. JEROME KEISLER and JACK H. SILVER 177
Observations on popular discussions of foundations
By G. KREISEL 189
Indescribability and the continuum
By KENNETH KUNEN 199
The sizes of the indescribable cardinals
By AZRIEL LEVY 205
On the logical complexity of several axioms of set theory
By AZRIEL LEVY 219
Categorical algebra and set-theoretic foundations
By SAUNDERS MAC LANE 231
The solution of one of Ulam's problems concerning analytic rectangles
By R. MANSFIELD 241
Predicative classes
By YIANNIS N. MOSCHOVAKIS 247
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