by Charles Ashbacher
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Collection of problems on Smarandache no...
Pluckings from the tree of Smarandache
SAMS Teach Yourself XML in 24 Hours
Topics in Recreational Mathematics 2/201...
Topics in Recreational Mathematics 1/201...
Tractatus logico-philosophicus
An Investigation of the Laws of Thought ...
Algèbre de la logique
The Game of Logic
Gödel's proof
Philosophische Untersuchungen