Pavol Safarik and Eyvind Briseid Free People Check 

( I'm Pavol Safarik)
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Colloquium Logicum 2012, Paderborn

www.math.uni-hamburg.de
... Eyvind Briseid and Pavol Safarik. A functional interpretation for nonstandard arithmetic. Javier Legris. On C. S. Peirce's Definitive Idea of Mathematical
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