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==References==
{{Citation | last1=Avigad | first1=Jeremy | title=Number theory and elementary arithmetic | doi=10.1093/philmat/11.3.257 | id={{MathSciNet | id = 2006194}} | year=2003 | journal=Philosophia Mathematica. Philosophy of Mathematics, its Learning, and its Application. Series III | issn=0031-8019 | volume=11 | issue=3 | pages=257–284}}
{{citation|first=Harvey|last=Friedman|title=grand conjectures|year=1999|url=http://cs.nyu.edu/pipermail/fom/1999-April/003014.html}}
[[Category:proof theory]]
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