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Somewhat earlier , exploration of mathematical practice and quasi-empiricism in mathematics from the 1950 s to 1980 s had sought alternatives to metamathematics in social behaviours around mathematics itself : for instance , Paul Erdős 's simultaneous belief in Platonism and a single " big book " in which all proofs existed , combined with his personal obsessive need or decision to collaborate with the widest possible number of other mathematicians .
 Paul Erdős
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 Paul Erdős