Famous trails to Paul Erdős

@article{Castro1999FamousTT,
  title={Famous trails to Paul Erdős},
  author={Rodrigo De Castro and Jerrold W. Grossman},
  journal={The Mathematical Intelligencer},
  year={1999},
  volume={21},
  pages={51-53}
}
The notion of Erd} os number has oated around the mathematical research community for more than thirty years, as a way to quantify the common knowledge that mathematical and scientiic research has become a very collaborative process in the twentieth century, not an activity engaged in solely by isolated individuals. In this paper we explore some (fairly short) collaboration paths that one can follow from Paul Erd} os to researchers inside and outside of mathematics. In particular, we nd that… 
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