by Raymond M. Smullyan
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The lady or the tiger? and other logic p...
First-order logic
What is the name of this book?
Satan, cantor, and infinity
The chess mysteries of Sherlock Holmes
Alice in puzzle-land
Gödel's proof
Aufzählbarkeit, Entscheidbarkeit, Berech...
The large, the small and the human mind
Shadows of the mind
Godel's Theorem in Focus