[FOM] strong arithmetical theorems?

Panu Raatikainen panu.raatikainen at helsinki.fi
Sun Oct 17 07:11:27 EDT 2010

Are there natural theorems of ordinary *arithmetic* which are not  
provable in weak theories such as S^1_2, EFA and such (that is,  
theories that can be interpreted in the Robinson Arithmetic Q) but  
require at least RCA_0, or something ?



Panu Raatikainen

Ph.D., Docent in Theoretical Philosophy

Department of Philosophy, History, Culture and Art Studies
P.O. Box 24  (Unioninkatu 38 A)
FIN-00014 University of Helsinki

E-mail: panu.raatikainen at helsinki.fi

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